WO2017119832A1 - Spring return throttle actuator, method of control thereof and throttle assembly - Google Patents

Spring return throttle actuator, method of control thereof and throttle assembly Download PDF

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Publication number
WO2017119832A1
WO2017119832A1 PCT/SE2016/051245 SE2016051245W WO2017119832A1 WO 2017119832 A1 WO2017119832 A1 WO 2017119832A1 SE 2016051245 W SE2016051245 W SE 2016051245W WO 2017119832 A1 WO2017119832 A1 WO 2017119832A1
Authority
WO
WIPO (PCT)
Prior art keywords
throttle
motor
actuator
spring
monitoring circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2016/051245
Other languages
French (fr)
Inventor
Fredrik STRÅÅT
Sebastian Zamani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Scania CV AB
Original Assignee
Scania CV AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scania CV AB filed Critical Scania CV AB
Priority to BR112018013035A priority Critical patent/BR112018013035A2/en
Priority to CN201680076795.1A priority patent/CN108431386A/en
Priority to EP16884072.6A priority patent/EP3400376A4/en
Priority to KR1020187021663A priority patent/KR102058661B1/en
Priority to US16/066,611 priority patent/US20190024592A1/en
Publication of WO2017119832A1 publication Critical patent/WO2017119832A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F02D9/1065—Mechanical control linkage between an actuator and the flap, e.g. including levers, gears, springs, clutches, limit stops of the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D11/107—Safety-related aspects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
    • F16K31/042—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves with electric means, e.g. for controlling the motor or a clutch between the valve and the motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
    • F16K31/043—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/0033—Electrical or magnetic means using a permanent magnet, e.g. in combination with a reed relays
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
    • F16K37/0025—Electrical or magnetic means
    • F16K37/0041—Electrical or magnetic means for measuring valve parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/14—Electronic commutators
    • H02P6/16—Circuit arrangements for detecting position
    • H02P6/17—Circuit arrangements for detecting position and for generating speed information
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/14—Electronic commutators
    • H02P6/16—Circuit arrangements for detecting position
    • H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
    • H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/02—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning induction conduits
    • F02D2009/0201—Arrangements; Control features; Details thereof
    • F02D2009/0213—Electronic or electric governor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
    • F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
    • F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
    • F02D2011/101—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles
    • F02D2011/102—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles at least one throttle being moved only by an electric actuator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • F02D2200/0404—Throttle position

Definitions

  • the invention relates to a spring return throttle actuator including: an electric, plural-coil, DC motor having an output shaft, a throttle return spring, a gear transmission connected to the output shaft, a control unit adapted to control power supply to the DC motor, wherein the actuator has a movement range between closed throttle and fully opened throttle.
  • the invention also relates to a method for control thereof and a throttle assembly.
  • Throttle assemblies are employed to control gas streams in respect of vehicle engines.
  • the actuator DC motor is typically supplied with an electric current to switch from a normally open to a closed throttle position or from a normally closed to an open throttle position.
  • the return spring tends to move the throttle to a determined "normal" position which will guarantee
  • the DC motor is supplied with current to create a dynamic electromotive force which, by virtue of the control unit, balances the spring force to obtain a desired stationary throttle position between closed throttle and fully open throttle.
  • the throttle can hereby be impossible or difficult to move properly and at proper speed over the whole or part of its movement range which is detrimental to the operation of the vehicle. It is, however, difficult to determine in what way the throttle assembly is defective. Also relatively small influences on throttle movements may impair engine control.
  • control unit includes a monitoring circuit adapted to monitor DC motor movement
  • the monitoring circuit is arranged to receive signals from at least one voltage sensor adapted to sense voltage induced in at least one of the DC motor coils during a spring forced return of the throttle, and
  • the monitoring circuit is arranged to create a
  • the spring For analyzing the condition of the return spring, the spring is typically tensioned maximally whereupon the system is made currentless, that means that the electric supply to the motor is interrupted. Thereupon the throttle together with the motor is returned to the "normal" position by the spring force. The time for the spring to press the throttle all the way back to that normal position will be a measurement
  • the obtained value describes the resist electromotive force generated by the electric motor when driven by an external force in the form of the return spring. Since said force in turn is depending on the rotational speed of the rotor of the actuator motor, it can hereby be established how fast the throttle moves. From that information it is possible to analyze the nature of the defect, if any, that the return spring is suffering from.
  • a representation of DC motor movement is of course dependent on throttle movement and can be any one of throttle speed and throttle position. It can also simply be a sampled voltage value or a momentary voltage amplitude value
  • a throttle with defective return spring might either move with more or less constant speed against a restriction or move unrestricted over part or parts of its range and move with restricted speed in intermediate range part or parts.
  • the voltage sensor is arranged to measure the induced voltage momentarily since this allows the monitoring circuit to produce a momentary representation of the amplitude thereby giving more advanced analyzing possibilities to more exactly diagnose what damage the spring suffers from.
  • a measured speed profile of the throttle can be compared to a plurality of stored throttle rotational speed profiles representing
  • results can in all cases be displayed to the operator visually on a screen and/or be signaled as return spring condition message, a light or a sound signal, particularly in the event that a defect has been detected.
  • the DC motor advantageously includes three coils but may also include more than three coils.
  • the control unit preferably includes a bridge circuit having one branch connected to each one of the coils.
  • Measuring induced voltage is then advantageously performed in relation to one of the branches.
  • Each branch suitably includes a transistor switch connected to each one of the coils.
  • the invention also relates to a method of controlling a spring return throttle actuator, said actuator including: an electric, plural-coil, DC motor having an output shaft, a throttle return spring, a gear transmission connected to the output shaft, a control unit adapted to control power supply to the DC motor, wherein the actuator has a movement range between closed throttle and fully opened throttle.
  • a spring return throttle actuator said actuator including: an electric, plural-coil, DC motor having an output shaft, a throttle return spring, a gear transmission connected to the output shaft, a control unit adapted to control power supply to the DC motor, wherein the actuator has a movement range between closed throttle and fully opened throttle.
  • the DC motor preferably includes three coils wherein voltage induced in at least one of the DC motor coils is sensed .
  • the coils are supplied with power from each one branch of a bridge circuit being included in the control unit.
  • each branch is advantageously switched through separate transistor switches.
  • the invention also concerns a throttle assembly including a throttle, a throttle actuator and a control unit, wherein the throttle actuator is according to what is stated above.
  • Fig. 1 illustrates a throttle assembly including a spring return throttle actuator according to the invention
  • Fig. 2 shows a control circuit for the inventive throttle actuator
  • Fig. 3 shows a simplified flow chart over an inventive method
  • Fig. 4 shows a diagram over measured voltage as a function of elapsed time
  • Fig. 5 shows a diagram over signal processed momentary rotational speed as a function of elapsed time.
  • Fig. 1 shows a throttle assembly whereof a spring return throttle actuator is generally depicted with reference number 1.
  • the actuator 1 includes a DC motor 2 having three coils CI, C2 and C3 in its stator S.
  • the rotor R is as usual provided with a permanent rotor magnet 3 and an output shaft 4.
  • a gear transmission 5 is connected to the output shaft 4 and an outgoing shaft 6 from the gear transmission 5 is coupled with its distal end to a throttle shaft 7 of a
  • the actuator has a movement range between closed throttle and fully opened throttle.
  • the throttle 8 is arranged in a channel 9 to control a gas stream flowing through the channel 9.
  • a throttle return spring 10 is positioned around the outgoing shaft 6 and functions to provide a spring torque urging the outgoing shaft 6 to rotate towards a "normal" position of the throttle 8 which may be fully open or fully closed depending on the nature of the throttle as explained above .
  • a control unit CPU is connected to the DC motor and is adapted to control supply of power to the DC motor and thereby to control the throttle position.
  • Movement sensors preferably Hall effect sensors, are indicated with D.
  • Fig. 2 illustrates a bridge circuit 11 positioned between a 24 Volts current source 12 for the supply of power to the three coils CI, C2 and C3 of the DC motor 3. It is to be noted that any suitable voltage can be used.
  • the bridge circuit includes a set of transistor switches ⁇ ⁇ - ⁇ that are made conductive - non conductive to controllably power supply the DC motor 3.
  • a voltage detector can be active in respect of either one (or more than one) of the conduits associated with the coils CI - C3 and signals therefrom be passed on to the CPU.
  • a plurality of detectors is preferably being used. This gives information about throttle position.
  • the detectors are suitably stationary and for example cooperating with a ring or part of a ring being rotationally associated with the rotor or with one of the shafts, said ring having a great number of evenly distributed marks or holes.
  • 13 indicates start of sequence. 14 indicates initiating DC motor to position throttle in desired position where the return spring is strained and stretched and verifying that throttle has reached the desired position .
  • Fig. 4 shows a diagram over measured voltage as a
  • the meandering curve, I m represents momentary voltage signal output from a voltage detector associated with a coil conduit as a function of time (t) .
  • Cmod represents a modulated curve thereof.
  • Fig. 5 shows a diagram over signal processed momentary rotational speed (n a ) and voltage (u a ) as a function of elapsed time (t) .
  • C ex represents an exemplary stored throttle
  • control circuitry can be laid out differently as can be the DC motor, for instance, the number of coils of the DC motor can be other than three.
  • closed throttle is intended to include a case with totally blocked opening as well as a case with a certain minimum opening that might exist.
  • opened throttle is intended the maximum opening achievable for the throttle in question.
  • sensors may be employed and they can be positioned in various places in association with the throttle assembly, for example close to the throttle itself.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

A spring return throttle actuator (1) including: an electric, plural-coil (C1, C2, C3) DC motor (2) having an output shaft (4), a throttle return spring (10), a gear transmission (5) connected to the output shaft, a control unit (CPU) adapted to control power supply to the DC motor (2), wherein the spring return throttle actuator (1) has a movement range between closed throttle and fully opened throttle. The control unit (CPU) includes a monitoring circuit adapted to monitor DC motor movement. The monitoring circuit is arranged to receive signals from at least one voltage sensor adapted to sense voltage induced in at least one of the DC motor coils (C1, C2, C3) during a spring forced return of the throttle, and the monitoring circuit is arranged to create a representation of DC motor movement based on said signals.

Description

SPRING RETURN THROTTLE ACTUATOR, METHOD OF CONTROL THEREOF AND
THROTTLE ASSEMBLY
FIELD OF THE INVENTION
The invention relates to a spring return throttle actuator including: an electric, plural-coil, DC motor having an output shaft, a throttle return spring, a gear transmission connected to the output shaft, a control unit adapted to control power supply to the DC motor, wherein the actuator has a movement range between closed throttle and fully opened throttle. The invention also relates to a method for control thereof and a throttle assembly.
BACKGROUND OF THE INVENTION
Throttle assemblies are employed to control gas streams in respect of vehicle engines. The actuator DC motor is typically supplied with an electric current to switch from a normally open to a closed throttle position or from a normally closed to an open throttle position.
It could be mentioned that in respect of for example an air inlet throttle valve, the throttle is normally open whereas in an EGR valve the throttle is normally closed.
As a rule, the return spring tends to move the throttle to a determined "normal" position which will guarantee
operation also in the event that the DC motor is without current. It is thereby an aim to maintain the required exhaust gas values etc.
In a background art throttle assembly, for reaching intermediate positions between closed throttle and fully opened throttle, the DC motor is supplied with current to create a dynamic electromotive force which, by virtue of the control unit, balances the spring force to obtain a desired stationary throttle position between closed throttle and fully open throttle.
It is previously known that there are occasionally problems with throttles for example because of mechanical deficiencies or some sort of obstruction preventing
unrestricted movement of the throttle. This might depend on the formation of ice or the accumulation of dirt around the seat of the throttle or in throttle shaft bearings, or a defective spring which for example has been damaged and obtained unwanted properties.
The throttle can hereby be impossible or difficult to move properly and at proper speed over the whole or part of its movement range which is detrimental to the operation of the vehicle. It is, however, difficult to determine in what way the throttle assembly is defective. Also relatively small influences on throttle movements may impair engine control.
AIM AND MOST IMPORTANT FEATURES OF THE INVENTION
It is an aim of the present invention to provide a throttle actuator according to the above wherein the problems of the background art are addressed and at least reduced. This aim is obtained in a throttle actuator according to the above in that
- that the control unit includes a monitoring circuit adapted to monitor DC motor movement,
- that the monitoring circuit is arranged to receive signals from at least one voltage sensor adapted to sense voltage induced in at least one of the DC motor coils during a spring forced return of the throttle, and
- that the monitoring circuit is arranged to create a
representation of DC motor movement based on said signals.
For analyzing the condition of the return spring, the spring is typically tensioned maximally whereupon the system is made currentless, that means that the electric supply to the motor is interrupted. Thereupon the throttle together with the motor is returned to the "normal" position by the spring force. The time for the spring to press the throttle all the way back to that normal position will be a measurement
describing whether the spring or anything else in the
mechanics is jammed or defective or if anything restricts the movement. At the same time, induced voltage will be measured.
The obtained value describes the resist electromotive force generated by the electric motor when driven by an external force in the form of the return spring. Since said force in turn is depending on the rotational speed of the rotor of the actuator motor, it can hereby be established how fast the throttle moves. From that information it is possible to analyze the nature of the defect, if any, that the return spring is suffering from.
It is also possible, in a simple embodiment, to set accept limits for momentary rotational speed as a function of time wherein values outside the limits are considered to indicate defects.
A representation of DC motor movement is of course dependent on throttle movement and can be any one of throttle speed and throttle position. It can also simply be a sampled voltage value or a momentary voltage amplitude value
describing DC motor speed.
A throttle with defective return spring might either move with more or less constant speed against a restriction or move unrestricted over part or parts of its range and move with restricted speed in intermediate range part or parts. These two scenarios can quite well give the same total time delay but has completely different basic background.
For that reason, it is advantageously preferred that the voltage sensor is arranged to measure the induced voltage momentarily since this allows the monitoring circuit to produce a momentary representation of the amplitude thereby giving more advanced analyzing possibilities to more exactly diagnose what damage the spring suffers from.
One advantage here is thus the capability to provide a more detailed picture of an existing defect. A measured speed profile of the throttle can be compared to a plurality of stored throttle rotational speed profiles representing
different kinds of defects so as to be coupled to one of them.
It is also possible to compare measured angular throttle position as a function of time to stored throttle position profiles. Such values are obtainable through conventional signal processing and derivable from measured voltage.
The results can in all cases be displayed to the operator visually on a screen and/or be signaled as return spring condition message, a light or a sound signal, particularly in the event that a defect has been detected.
Knowledge of prevailing throttle movement parameters can even be used for adapting possible control algorithms in the vehicle to adapt engine control to the prevailing problem in order to reduce impact of the defect.
The DC motor advantageously includes three coils but may also include more than three coils.
The control unit preferably includes a bridge circuit having one branch connected to each one of the coils.
Measuring induced voltage is then advantageously performed in relation to one of the branches. Each branch suitably includes a transistor switch connected to each one of the coils.
The invention also relates to a method of controlling a spring return throttle actuator, said actuator including: an electric, plural-coil, DC motor having an output shaft, a throttle return spring, a gear transmission connected to the output shaft, a control unit adapted to control power supply to the DC motor, wherein the actuator has a movement range between closed throttle and fully opened throttle. The
movement of the DC motor control unit is monitored by a monitoring circuit. Voltage induced in at least one of the DC motor coils during a spring forced return of the throttle is sensed by a voltage sensor of the monitoring circuit. A
representation of DC motor movement is created based on said signals .
Advantages as above are obtained through the inventive method.
The DC motor preferably includes three coils wherein voltage induced in at least one of the DC motor coils is sensed .
The coils are supplied with power from each one branch of a bridge circuit being included in the control unit. In particular, when the coils are supplied with power from each one branch of a bridge circuit being included in the control unit, each branch is advantageously switched through separate transistor switches.
The invention also concerns a throttle assembly including a throttle, a throttle actuator and a control unit, wherein the throttle actuator is according to what is stated above.
Further features of and advantages of the invention will be explained below at the background of embodiments.
BRIEF DESCRIPTION OF DRAWINGS
The invention will now be described in greater detail by way of embodiments and with reference to the annexed drawings, wherein :
Fig. 1 illustrates a throttle assembly including a spring return throttle actuator according to the invention,
Fig. 2 shows a control circuit for the inventive throttle actuator, Fig. 3 shows a simplified flow chart over an inventive method,
Fig. 4 shows a diagram over measured voltage as a function of elapsed time, and
Fig. 5 shows a diagram over signal processed momentary rotational speed as a function of elapsed time.
DESCRIPTION OF EMBODIMENTS
Fig. 1, shows a throttle assembly whereof a spring return throttle actuator is generally depicted with reference number 1. The actuator 1 includes a DC motor 2 having three coils CI, C2 and C3 in its stator S. The rotor R is as usual provided with a permanent rotor magnet 3 and an output shaft 4.
A gear transmission 5 is connected to the output shaft 4 and an outgoing shaft 6 from the gear transmission 5 is coupled with its distal end to a throttle shaft 7 of a
throttle 8. The actuator has a movement range between closed throttle and fully opened throttle.
The throttle 8 is arranged in a channel 9 to control a gas stream flowing through the channel 9.
A throttle return spring 10 is positioned around the outgoing shaft 6 and functions to provide a spring torque urging the outgoing shaft 6 to rotate towards a "normal" position of the throttle 8 which may be fully open or fully closed depending on the nature of the throttle as explained above .
A control unit CPU is connected to the DC motor and is adapted to control supply of power to the DC motor and thereby to control the throttle position. Movement sensors, preferably Hall effect sensors, are indicated with D.
Fig. 2 illustrates a bridge circuit 11 positioned between a 24 Volts current source 12 for the supply of power to the three coils CI, C2 and C3 of the DC motor 3. It is to be noted that any suitable voltage can be used.
The bridge circuit includes a set of transistor switches Τ ι - Τβ that are made conductive - non conductive to controllably power supply the DC motor 3.
It is possible to make variations of the duration of conductivity of the transistor switches in order to apply force of different magnitudes by varying and by controlling transistor switches. It is possible to measure voltage in at least one of the conduits connected to the coils. A voltage detector can be active in respect of either one (or more than one) of the conduits associated with the coils CI - C3 and signals therefrom be passed on to the CPU.
It is possible to receive information from the DC motor and associated cables about its operation. If the motor is rotated, the rotational speed is directly proportional to the voltage. It is also possible to measure voltage which
momentarily results in knowledge about rotational speed. For detection of rotational position of the rotor of the motor, a plurality of detectors is preferably being used. This gives information about throttle position.
The detectors are suitably stationary and for example cooperating with a ring or part of a ring being rotationally associated with the rotor or with one of the shafts, said ring having a great number of evenly distributed marks or holes.
Monitoring the durations between pulses from three distributed mark or hole detectors results in information of position and rotational speed. There is also a possibility to detect rotor acceleration if required for some reason.
In the simplified flow chart in Fig. 3, an exemplary method sequence related to the invention is briefly
illustrated .
13 indicates start of sequence. 14 indicates initiating DC motor to position throttle in desired position where the return spring is strained and stretched and verifying that throttle has reached the desired position .
15 indicates cutting current to the DC motor and
initiating voltage measuring in at least one of the conduits being connected to the coils.
16 indicates monitoring throttle movements effected by the return spring by voltage measuring.
17 indicates evaluating monitored throttle movement pattern in relation to a stored exemplary movement curve.
18 indicates amending and adapting engine control values to established prevailing throttle actuation conditions.
19 indicates issuing a return spring condition message to the user and ending of sequence.
The sequence may be supplemented with additional steps and is repeated as required.
Fig. 4 shows a diagram over measured voltage as a
function of elapsed time. The meandering curve, Im, represents momentary voltage signal output from a voltage detector associated with a coil conduit as a function of time (t) . Cmod represents a modulated curve thereof.
Fig. 5 shows a diagram over signal processed momentary rotational speed (na) and voltage (ua) as a function of elapsed time (t) . Cex represents an exemplary stored throttle
rotational speed profile. As seen in Fig. 5, the rotational speed (na) and voltage (ua) curves in the shown example have good conformity to the exemplary stored throttle rotational speed profile curve Cex. Hereby the condition of the return spring can be estimated to be as an exemplary return spring condition corresponding to the conforming stored profile.
Furthermore, when a plurality of exemplary throttle rotational speed profile curves representing different return spring conditions are stored, the return spring condition is
estimated to be as corresponds to the profile curve that most closely conforms to the measured profile.
The invention can be modified within the scope of the annexed claims. For example, the control circuitry can be laid out differently as can be the DC motor, for instance, the number of coils of the DC motor can be other than three.
The feature "closed throttle" is intended to include a case with totally blocked opening as well as a case with a certain minimum opening that might exist. With the feature "opened throttle" is intended the maximum opening achievable for the throttle in question.
Different kinds of sensors may be employed and they can be positioned in various places in association with the throttle assembly, for example close to the throttle itself.

Claims

CLAIMS :
1. Spring return throttle actuator (1) including:
- an electric, plural-coil (CI, C2, C3) DC motor (2) having an output shaft (4),
- a throttle return spring (10),
- a gear transmission (5) connected to the output shaft,
- a control unit (CPU) adapted to control power supply to the DC motor (2) ,
wherein the spring return throttle actuator (1) has a movement range between closed throttle and fully opened throttle, characterized in
- that the control unit (CPU) includes a monitoring circuit adapted to monitor DC motor movement,
- that the monitoring circuit is arranged to receive signals from at least one voltage sensor adapted to sense voltage induced in at least one of the DC motor coils (CI, C2, C3) during a spring forced return of the throttle, and
- that the monitoring circuit is arranged to create a
representation of DC motor movement based on said signals.
2. Actuator according to claim 1, characterized in
- that the voltage sensor is arranged to measure the induced voltage momentarily, and
- that the monitoring circuit is arranged to produce a momentary representation of the amplitude of the voltage to diagnose the spring.
3. Actuator according to claim 1 or 2, characterized in
- that the control unit (CPU) includes a bridge circuit having one branch connected to each one of the coils.
4. Actuator according to claim 3, characterized in
- that each branch includes a transistor switch (Ti - Ίβ) connected to each one of the coils (CI, C2, C3) .
5. Actuator according to any one of the previous claims, characterized in
- that the monitoring circuit is arranged to compare measured rotational speed values to stored rotational speed profiles for analyzing purposes.
6. Actuator according to any one of the previous claims, characterized in
- that the monitoring circuit is arranged to compare measured angular throttle position values to stored throttle position profiles for analyzing purposes.
7. Method of controlling a spring return throttle actuator including :
- an electric, plural-coil (CI, C2, C3) DC motor (2) having an output shaft (4),
- a throttle return spring (10),
- a gear transmission (5) connected to the output shaft (4),
- a control unit (CPU) adapted to control power supply to the DC motor (2) ,
wherein the actuator (1) has a movement range between closed throttle and fully opened throttle,
characterized in
- that the movement of the DC motor (2) is monitored by a monitoring circuit of the control unit (CPU),
- that voltage induced in at least one of the DC motor coils (CI, C2, C3) during a spring forced return of the throttle is sensed by a voltage sensor of the monitoring circuit, and - that a representation of DC motor movement is created based on said signals.
8. Method according to claim 7, wherein the DC motor (2) includes three coils, characterized in
- that voltage induced in at least one of the DC motor coils (CI, C2, C3) is sensed.
9. Method according to claim 7 or 8, characterized in
- that the DC motor coils (CI, C2, C3) are supplied with power from each one branch of a bridge circuit being included in the control unit (CPU) .
10. Method according to any one claims 7 - 9, characterized in - that measured rotational speed values are compared to stored rotational speed profiles for analyzing purposes.
11. Actuator according to any one of claims 7 - 10,
characterized in
- that measured angular throttle position values are compared to stored throttle position profiles for analyzing purposes.
12. Throttle assembly including a throttle and a throttle actuator, characterized in that the throttle actuator is according to any one of claims 1 - 6.
PCT/SE2016/051245 2016-01-05 2016-12-12 Spring return throttle actuator, method of control thereof and throttle assembly Ceased WO2017119832A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BR112018013035A BR112018013035A2 (en) 2016-01-05 2016-12-12 spring return butterfly valve actuator, spring control method and butterfly valve assembly
CN201680076795.1A CN108431386A (en) 2016-01-05 2016-12-12 Spring reset throttle actuator, its control method and air throttle component
EP16884072.6A EP3400376A4 (en) 2016-01-05 2016-12-12 Spring return throttle actuator, method of control thereof and throttle assembly
KR1020187021663A KR102058661B1 (en) 2016-01-05 2016-12-12 Spring Return Throttle Actuators, Methods of Controlling Spring Return Throttle Actuators and Throttle Assemblies
US16/066,611 US20190024592A1 (en) 2016-01-05 2016-12-12 Spring return throttle actuator, method of control thereof and throttle assembly

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1650010-0 2016-01-05
SE1650010A SE539527C2 (en) 2016-01-05 2016-01-05 Spring return throttle actuator, method of control thereof and throttle assembly

Publications (1)

Publication Number Publication Date
WO2017119832A1 true WO2017119832A1 (en) 2017-07-13

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US (1) US20190024592A1 (en)
EP (1) EP3400376A4 (en)
KR (1) KR102058661B1 (en)
CN (1) CN108431386A (en)
BR (1) BR112018013035A2 (en)
SE (1) SE539527C2 (en)
WO (1) WO2017119832A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020187486A1 (en) * 2019-03-18 2020-09-24 Belimo Holding Ag Method for operating a control valve
IT202200015945A1 (en) * 2022-07-27 2024-01-27 Fpt Ind Spa Method of controlling the power supply of a throttle valve of an internal combustion engine

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108700006B (en) * 2016-02-25 2020-11-17 科勒公司 Electronic fuel injection system for engine
JP7256018B2 (en) * 2019-01-28 2023-04-11 アズビル株式会社 Electric actuator and deterioration index calculation method
JP7256041B2 (en) * 2019-03-19 2023-04-11 アズビル株式会社 Electric actuator and deterioration index calculation method
CN110067661B (en) * 2019-04-25 2022-08-05 深圳市元征科技股份有限公司 Parameter resetting method and device for vehicle throttle valve and vehicle-mounted equipment
GB2621638A (en) * 2021-05-26 2024-02-21 I Tork Controls Co Ltd Compact spring return actuator

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11190230A (en) * 1997-12-25 1999-07-13 Hitachi Ltd Engine throttle valve control device and control method
US20040059496A1 (en) * 2002-09-19 2004-03-25 Visteon Global Technologies, Inc. Off-line diagnostics for an electronic throttle
US20040149260A1 (en) * 2003-01-20 2004-08-05 Mitsubishi Denki Kabushiki Kaisha Throttle vale control device
US20040212336A1 (en) * 2003-04-24 2004-10-28 Mcmillan Scott D. Spring return actuator for a damper
US20060016427A1 (en) * 2004-07-20 2006-01-26 Denso Corporation Valve position controlller

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1987002097A1 (en) * 1982-07-02 1987-04-09 Ishii Mitsuaki Rotational speed controller for engine
DE3417089A1 (en) * 1984-05-09 1985-11-14 Robert Bosch Gmbh, 7000 Stuttgart DRIVE CONTROL DEVICE
US4684866A (en) * 1986-04-16 1987-08-04 General Motors Corporation Adaptive controller for a motor vehicle engine throttle operator
JPH0674063A (en) * 1992-08-27 1994-03-15 Mitsubishi Electric Corp Running control device for vehicle
AUPO271696A0 (en) * 1996-10-02 1996-10-24 Orix Vehicle Technology Pty Ltd Engine manifold valve control
JP3628855B2 (en) * 1997-11-18 2005-03-16 三菱電機株式会社 Control method and control device for engine intake air amount
JP3463859B2 (en) * 1998-09-18 2003-11-05 日産自動車株式会社 Inspection method for hybrid vehicles
JP2001003770A (en) * 1999-06-16 2001-01-09 Unisia Jecs Corp Electric throttle valve device
EP2871769B1 (en) * 2004-06-04 2017-01-04 Belimo Holding AG Brushless DC motor
JP5438081B2 (en) * 2011-09-21 2014-03-12 日立オートモティブシステムズ株式会社 Brushless motor drive device
EP2573640B1 (en) * 2011-09-26 2014-06-18 Siemens Aktiengesellschaft Spring-loaded drive with active recovery in direct current circuit
JP5440596B2 (en) * 2011-12-05 2014-03-12 株式会社デンソー Electric actuator and control valve equipped with electric actuator
JP5854154B2 (en) * 2012-11-27 2016-02-09 日産自動車株式会社 Acceleration / deceleration erroneous operation determination device, erroneous operation acceleration suppression control device, acceleration / deceleration erroneous operation determination method
DE102012111810B4 (en) * 2012-12-05 2015-02-05 Pierburg Gmbh Valve device for an internal combustion engine
CN104481707B (en) * 2014-12-01 2017-02-22 南京奥联汽车电子技术有限公司 Terminal control time point predication method of electronic throttle valve and electronic throttle valve system
CA2936369A1 (en) * 2015-07-16 2017-01-16 Iain Wilson Robotic apparatus for plowing of snow from a predefined area
US10354545B2 (en) * 2015-09-01 2019-07-16 Bnsf Railway Company Locomotive electrical systems simulator
SE539525C2 (en) * 2016-01-05 2017-10-10 Scania Cv Ab Spring return throttle actuator, method of control thereof and throttle assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11190230A (en) * 1997-12-25 1999-07-13 Hitachi Ltd Engine throttle valve control device and control method
US20040059496A1 (en) * 2002-09-19 2004-03-25 Visteon Global Technologies, Inc. Off-line diagnostics for an electronic throttle
US20040149260A1 (en) * 2003-01-20 2004-08-05 Mitsubishi Denki Kabushiki Kaisha Throttle vale control device
US20040212336A1 (en) * 2003-04-24 2004-10-28 Mcmillan Scott D. Spring return actuator for a damper
US20060016427A1 (en) * 2004-07-20 2006-01-26 Denso Corporation Valve position controlller

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3400376A4 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020187486A1 (en) * 2019-03-18 2020-09-24 Belimo Holding Ag Method for operating a control valve
US11953115B2 (en) 2019-03-18 2024-04-09 Belimo Holding Ag Method and actuator for detecting blocking of control valve regulating flow of fluid
IT202200015945A1 (en) * 2022-07-27 2024-01-27 Fpt Ind Spa Method of controlling the power supply of a throttle valve of an internal combustion engine
EP4311928A1 (en) * 2022-07-27 2024-01-31 FPT Industrial S.p.A. Method for controlling the electric supply of a butterfly valve of an internal combustion engine

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US20190024592A1 (en) 2019-01-24
KR102058661B1 (en) 2019-12-23
SE1650010A1 (en) 2017-07-06
CN108431386A (en) 2018-08-21
KR20180096783A (en) 2018-08-29
BR112018013035A2 (en) 2018-12-04
SE539527C2 (en) 2017-10-10
EP3400376A4 (en) 2019-09-11
EP3400376A1 (en) 2018-11-14

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