EP0985811A2 - Auspuffbremse mit elektromagnetischer Steuerung - Google Patents

Auspuffbremse mit elektromagnetischer Steuerung Download PDF

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Publication number
EP0985811A2
EP0985811A2 EP99117743A EP99117743A EP0985811A2 EP 0985811 A2 EP0985811 A2 EP 0985811A2 EP 99117743 A EP99117743 A EP 99117743A EP 99117743 A EP99117743 A EP 99117743A EP 0985811 A2 EP0985811 A2 EP 0985811A2
Authority
EP
European Patent Office
Prior art keywords
exhaust brake
vehicle
exhaust
engine
brake according
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.)
Withdrawn
Application number
EP99117743A
Other languages
English (en)
French (fr)
Other versions
EP0985811A3 (de
Inventor
Leonardo Di Stefano
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.)
Dielle Ricambi Sas Di Stefano & C
Original Assignee
Dielle Ricambi Sas Di Stefano & C
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 Dielle Ricambi Sas Di Stefano & C filed Critical Dielle Ricambi Sas Di Stefano & C
Publication of EP0985811A2 publication Critical patent/EP0985811A2/de
Publication of EP0985811A3 publication Critical patent/EP0985811A3/de
Withdrawn legal-status Critical Current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
    • F02D9/04—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits concerning exhaust conduits
    • F02D9/06—Exhaust brakes

Definitions

  • the present invention refers to an exhaust brake for small size trucks.
  • the invention refers to a mechanic exhaust brake with an exhaust butterfly valve driven by an electromagnetic cylinder coupled to a control unit, for commercial or industrial small or medium diesel trucks, which normally lack such equipment.
  • the same electronic control unit can be used for driving a solenoid valve, for controlling therefore a pneumatic exhaust brake, normally used on heavy trucks, which used the compressed air system present on such vehicles.
  • the energy of the compressed air is used for closing the engine exhaust pipe, increasing the internal compression, and facilitating the stopping of the vehicle when it is in deceleration.
  • an exhaust brake for an agricultural vehicle or for a tracked building vehicle Such vehicles are provided with two brake pedals, one acting on left wheels and another acting on right wheels.
  • This expedient which allows the vehicle to perform sharp turns, does not allow however the use of a traditional exhaust brake, in that the operation of one of the brake pedals would cause an engine stop and not the desired braking action.
  • the electric exhaust brake disclosed in the French document is therefore provided with a switch that is closed only when both brake pedals are pressed and that operates an electromagnetic actuator for closing the engine exhaust pipe.
  • a second switch coupled to the vehicle clutch pedal, opens the electric circuit when the clutch pedal is pressed, avoiding an engine stop.
  • Such device has however the risk of an unexpected engine stop, in that, even when the vehicle is not moving and the speed gear is in a neutral position, it is always necessary to press the clutch pedal before pressing the brake pedal.
  • a first object of the present invention it is therefore to provide an electric exhaust brake with an electronic control, cheap and easy to install as an accessory on small trucks or on heavy trucks already provided with a pneumatic exhaust brake.
  • the operation of the brake does never interfere with the engine operation and, especially, can never stop the engine accidentally.
  • the exhaust brake realised according to the invention can be advantageously mounted on every kind of motor vehicle, preferably a diesel vehicle, allowing to perform a better braking, to reduce the braking distance, to lower the temperature and consumption of the brake elements and to lower fuel consumption.
  • the vehicle to which is applied the exhaust brake is provided with a traditional braking system operated by a pedal; an electric contact is coupled to the pedal for the switching on the vehicle rear stoplights.
  • FIG. 1 is shown a mechanical stop valve for the engine exhaust gases coupled to an electromagnetic cylinder actuator 9, in a front view, and in a top view in figure 2.
  • the stop valve comprises a main hollow body 1 having inside a shutter element, or butterfly 4, substantially circular and pivoted on a rotating shaft 5.
  • the rotation of the butterfly 4 on its axis of rotation 5, about 90°, causes the closing of the inner passage into the main hollow body.
  • Two flanges 2 and 3 are fixed to the main body 1 for the fitting with pipes of the vehicle exhaust system.
  • the stop valve can therefore be easily installed between the exhaust pipe coming from the engine and a first expansion chamber so that the exhaust pipe is closed as close as possible to the engine.
  • the stop valve can be inserted in whichever point of the vehicle exhaust system; nevertheless better results are obtained if the valve is placed near the engine.
  • a supporting plate 11 firmly fixed to the main body 1 of the stop valve, supports the electromagnetic cylinder actuator 9, so that the actuator-valve assembly becomes a compact element easy and quick to install.
  • the piston 13 of the actuator 9, actuated by at least a solenoid, is coupled to the shaft 5 of the butterfly 4 by means of an articulated joint 8, a junction arm 7 and a lever 6.
  • the linear movement of the piston 13 is therefore converted in a rotation movement of the butterfly 4 around its axis 5, allowing to close and open the exhaust duct by means of electric signals sent to the electromagnetic actuator 9 through its electric connection plug 12.
  • a helical spring 10 facilitates the reverse motion of the piston 13, withdrawing it when the solenoid is not energised.
  • the electromagnetic actuator 9 is provided with two solenoids, a first power solenoid is initially used for closing the butterfly valve 4 and a second solenoid, draining a low current, is used for maintaining the valve in closed position.
  • This expedient allows reducing to the minimum the current drawn from the electric equipment of the vehicle.
  • Figure 3 shows an electronic block diagram of an electronic control unit 60 for the exhaust brake with electromagnetic control.
  • the control unit 60 is powered by a ground terminal 68, connected to the negative terminal of the vehicle battery, and by a power supply terminal 75, connected to the positive terminal of the battery.
  • Two input terminals 66 and 67 receive, from an inductive sensor placed near the vehicle alternator, an electric signal which varies proportionally to the number of revolutions of the alternator and, consequently, to the number of revolutions of the engine.
  • a third input terminal 69 is connected to an electric contact or switch, coupled to the brake pedal, for the vehicle stoplights.
  • a first interface circuit 61 converts the signal coming from the inductive sensor into a voltage proportional to the engine revolutions, compares that voltage with a predetermined threshold voltage and generates a logic positive signal if that voltage is higher then the predetermined threshold voltage.
  • An enabling circuit 63 receives the logic signal coming from the circuit 61 and the signal coming from the stoplights switch and enables an output enable signal when both the input signals are active, i.e. when the engine revolutions are over the predetermined threshold and the brake pedal is pressed.
  • the enable signal reaches the output power interface circuit 64 and a switch circuit 65.
  • the output power interface circuit 64 drives, through the output terminals 72, 73 and 74, the electromagnetic piston actuator 9.
  • the terminal 72 is a ground terminal
  • the terminal 73 supplies, for a limited initial time, the current needed by the power solenoid for closing the butterfly valve 4
  • the terminal 74 supplies the second solenoid which maintains the valve in the closed position.
  • the interface circuit 64 includes therefore a timer which allows the power solenoid to be energised for a predetermined initial limited time.
  • Same electromagnetic piston actuators have a fourth connection terminal, used for forcing back the piston to the stand-by position; in this case the interface circuit 64 will power that terminal after having switched off the second solenoid.
  • the switch circuit 65 opens, through the terminals 70 and 71, the contact of a solenoid valve present in the fuel supply circuit of the vehicle engine.
  • a power supply circuit 62 reduces the battery voltage to a lower regulated voltage suitable for supplying safely all the control unit circuits, in particular circuit 61 and circuit 63.
  • figure 4 is shown the wiring electric diagram of the control unit 60 in the electric equipment of a diesel vehicle not provided with an exhaust brake.
  • the short dashes lines represents the wires of the vehicle electric equipment while the continuous lines are the new wires which must be connected for installing the system.
  • An ignition lock key 78 of the vehicle supplies current to the brake pedal switch 77 and to the solenoid valve 79 of the diesel fuel system.
  • the switch 77 switches on the stoplights, shown in figure as a lamp symbol 76 connected between the switch 77 and ground.
  • a first wire connects the common node between the switch 77 and the lamp 76 with the input terminal 69 of the control unit.
  • the terminals 70 and 71 break, in the point 83, the wire that supplies the diesel fuel solenoid valve 79 and allow the control unit to open and close the valve.
  • the input terminals 66 and 67 are connected to the inductive sensor 81 that is physically coupled to the vehicle alternator 80.
  • the terminals 75 and 68 are connected to the battery 82, respectively to the positive and negative poles.
  • the exhaust brake device previously described can be used preferably on vehicles provided with a direct injection diesel engine, in that this kind of engine allows to interrupt easily the diesel fuel to the engine.
  • the above illustrated exhaust brake is easily installable on all vehicles that are not provided with, without the necessity of modifying the vehicle brake system and therefore without the necessity of a new vehicle approval or homologation.
  • control unit immediately re-opens the gas exhaust valve and the fuel solenoid valve, avoiding a sudden engine stop.
  • control unit is likewise easily utilisable for better managing a pneumatic exhaust braking system already installed on a heavy truck.
  • the electromagnetic actuator 9 is in this case an electrically controlled valve, or solenoid valve, replacing a mechanical valve in the compressed air circuit used for controlling a pneumatic actuator that closes the exhaust pipes of the vehicle.
  • the electronic control of the pneumatic exhaust brake allows obtaining all the advantages of the above-described system allowing, at a limited cost, to improve the management of the existing exhaust braking system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Braking Arrangements (AREA)
EP99117743A 1998-09-11 1999-09-09 Auspuffbremse mit elektromagnetischer Steuerung Withdrawn EP0985811A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1998TO000776A IT1304987B1 (it) 1998-09-11 1998-09-11 Freno motore a comando elettromagnetico.
ITTO980776 1998-09-11

Publications (2)

Publication Number Publication Date
EP0985811A2 true EP0985811A2 (de) 2000-03-15
EP0985811A3 EP0985811A3 (de) 2000-09-06

Family

ID=11417035

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99117743A Withdrawn EP0985811A3 (de) 1998-09-11 1999-09-09 Auspuffbremse mit elektromagnetischer Steuerung

Country Status (2)

Country Link
EP (1) EP0985811A3 (de)
IT (1) IT1304987B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111183276A (zh) * 2017-09-29 2020-05-19 本田技研工业株式会社 排气传感器的安装结构
CN112576658A (zh) * 2020-12-18 2021-03-30 陕西法士特齿轮有限责任公司 一种amt制动器的气路控制系统及控制方法
CN119021791A (zh) * 2024-07-31 2024-11-26 东风商用车有限公司 发动机制动阀驱动电路及关断实现方法、设备、介质

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2629411A3 (fr) 1988-03-30 1989-10-06 Steyr Daimpler Puch Ag Dispositif de freinage pour vehicule automobile a moteur diesel

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2625095C2 (de) * 1976-06-04 1983-12-15 M.A.N. Maschinenfabrik Augsburg-Nürnberg AG, 8500 Nürnberg Steuerung für Motor-Auspuffbremsen
JPS60243329A (ja) * 1984-05-16 1985-12-03 Mitsubishi Motors Corp エンジンの過給装置
DE3914698A1 (de) * 1989-05-04 1990-11-08 Daimler Benz Ag Verfahren zur steuerung eines motorbremssystems einer ein fahrzeug antreibenden brennkraftmaschine
DE4321137A1 (de) * 1993-06-25 1995-01-05 Alfred Schmidt Auspuffmotorbremse mit Spaltöffnungsstellung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2629411A3 (fr) 1988-03-30 1989-10-06 Steyr Daimpler Puch Ag Dispositif de freinage pour vehicule automobile a moteur diesel

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111183276A (zh) * 2017-09-29 2020-05-19 本田技研工业株式会社 排气传感器的安装结构
CN111183276B (zh) * 2017-09-29 2022-07-26 本田技研工业株式会社 排气传感器的安装结构
CN112576658A (zh) * 2020-12-18 2021-03-30 陕西法士特齿轮有限责任公司 一种amt制动器的气路控制系统及控制方法
CN112576658B (zh) * 2020-12-18 2022-06-10 陕西法士特齿轮有限责任公司 一种amt制动器的气路控制系统及控制方法
CN119021791A (zh) * 2024-07-31 2024-11-26 东风商用车有限公司 发动机制动阀驱动电路及关断实现方法、设备、介质

Also Published As

Publication number Publication date
IT1304987B1 (it) 2001-04-05
EP0985811A3 (de) 2000-09-06
ITTO980776A0 (it) 1998-09-11
ITTO980776A1 (it) 2000-03-11

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