JPH02201037A - Engine output control device - Google Patents

Abstract

PURPOSE:To provide possibility of consolidated installation of various controls by determining the target suction air amounts corresponding to the amount of accel. stamping, slippage of car wheel, and constant speed running, and by deciding the target degree of throttle opening from these air amounts. CONSTITUTION:In controlling, first a throttle by-wire control part 30 determines the target value of air suction amount which is in accordance with the amount of accel. pedal 20 stamping. A traction control part 40 determines the target value of air suction amount with which slippage of a wheel 15 can be converged. With turning-on of an auto-cruise switch 60 an auto-cruise control part 50 determines the target value of air suction amount necessary for constant speed running. A main control part 70 determined the target degree of throttle on the basis of these target values of air suction amount. According to the determined target degree of throttle opening, a motor drive control part 90 controls a step motor 7 so as to open and close a throttle valve 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an engine output control device that controls engine output using a throttle valve.

(Prior Art) In general, an engine output control device called a drive-by-wire has been developed and is being put into practical use.

This system does not mechanically connect the accelerator pedal and the throttle valve, but instead detects the depression position (operation amount) of the accelerator pedal, determines the target drive shaft torque from the detected position, and makes sure that the target drive shaft torque is obtained. The motor drives the throttle valve.

An example of the application of this drive or by-wire is so-called throttle-by-wire control, which is control that matches the relationship between accelerator operation and engine output to predetermined conditions that take into account the driver's feeling and the movement of the vehicle.

In addition, when a wheel slips, there is a traction control that reduces the opening of the throttle valve regardless of whether the accelerator pedal is pressed to stop the slip.

Furthermore, there is an auto cruise control that maintains a desired speed even when the accelerator pedal is released.

On the other hand, it would be advantageous if all three types of control could be integrated into a drive-by-wire system device.

(Problem to be Solved by the Invention) However, when performing such integration, there is a problem that simply arranging the configurations of each control makes the device large in size.

Further, the final operating means for each control is the throttle valve, and since there is only one throttle valve, there is a problem in that the opening degree control for the throttle valve becomes complicated when integrated.

This invention was made in view of the above circumstances,
The objective is to integrate accelerator-by-wire control, traction control, and auto-cruise control without increasing the size of the device or complicating the opening control for the throttle valve. The object of the present invention is to provide an engine output control device that makes it possible to control engine output.

[Configuration of the Invention J (Means for Solving the Problems) Target intake air amount A/N t according to the amount of accelerator operation
, means for determining a target intake air amount jlA/Nt2 at which wheel slip can be converged, means for determining a target intake air amount A/Nt3 necessary for constant speed driving, and means for determining the target intake air amount A/Nt3 necessary for constant speed driving. Amount A/Nt,, A/Nt2.
It includes means for selecting at least one of A/Nt3 according to the operating mode, and means for controlling the opening degree of the throttle valve according to the target intake air amount selected by this means.

(Function) Target intake air amount A/Nt1 for throttle-by-wire control
,) Target intake air amount A/Nt2 for traction control and target intake air gkA/N for auto cruise control
t3 occurs, and one of these target intake air amounts is selected depending on the driving mode and the like. and,
The opening degree of the throttle valve is controlled according to the selected target intake air amount.

Throttle-by-wire control is a configuration that controls the opening degree of the throttle valve according to this target intake air amount.

Toyokawa is responsible for the traffic control and auto cruise control.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 1, an air cleaner 1 has an element 2 and an air flow sensor 3. In FIG.

This air flow sensor 3 detects the amount of intake air sucked through the element 2.

An intake passage 5 for introducing combustion air from the air cleaner 1 to the engine body 4 is provided, and a throttle valve 6 is disposed in the middle of the intake passage 5.

The throttle valve 6 adjusts the amount of air passing through the intake passage 5, and can smoothly rotate from a fully closed position to a fully open position. A rotating shaft of this throttle valve 6 is connected to a shaft of a step motor 7.

In addition, a torque converter 11 is attached to the output shaft of the engine body 4.
A pump is connected thereto, and a shaft 12 is connected to the turbine of the torque converter 11. Further, a drive shaft 14 is connected to the shaft 12 via a transmission 13, and wheels 15 are mounted on the drive shaft 14.

Note that the torque converter 11, shaft 12, and transmission 13 constitute an automatic transmission.

In addition, the intake air f detected by the air flow sensor 3
f1A is sent to the engine control computer (hereinafter referred to as ECI) 16, where the intake air per revolution j
l A / N r is calculated for each predetermined crank angle,
An amount of fuel determined according to the intake air jlA/Nr is injected into the cylinders of the engine body 4.

Furthermore, the intake air fIkA/N calculated by EC116
r is supplied to an auto cruise control section 50 and a main control section 70, which will be described later.

In addition, regarding the unit of intake air amount, the following explanation also shows:
Use air jlA/N per revolution.

On the other hand, 20 is an accelerator pedal connected to a throttle-by-wire (TBW) control section 30.

The throttle-by-wire control unit 30 detects the depression position Ap as the operation amount of the accelerator pedal 20, and determines the target intake air IIA/N t according to the detected position Ap.

Reference numeral 40 denotes a traction control unit that detects wheel slip based on the driven wheel speed V' and the driving wheel speed V' detected by a sensor (not shown), and determines a target intake air amount A/N t 3 at which the slip can be converged. It is something to seek.

Reference numeral 50 denotes an auto-cruise control unit, which sets the auto-cruise mode (AS) by operating the auto-cruise switch 60.
When the mode (C mode) is set, the target intake air jilA/N t 3 necessary to maintain the current vehicle speed constant, that is, necessary for constant speed driving, is determined.

The target intake air amount A/N t + , A/N t2 , A/N tg determined or obtained by these control units are as follows:
It is supplied to the main JLILL1 section 70.

This main control section 70 controls the target intake air amount A/Nt, , A/
A functional means for selecting at least one of Nt2 and A/Nt according to the driving mode, the target intake air amount selected by this means, and the intake air it A from the EC116.
/ N r It has a functional means for determining the target throttle opening degree θ for the throttle valve 6 according to the value θ.

In addition, the driving mode is auto cruise switch 6.
Auto cruise mode set by 0 operation,
Slip jlDV determined by the traction control unit 40
Traction mode (
TRC mode).

The target throttle opening θ determined by the main $ilS section 70 is supplied to the motor drive control section 90.

The motor drive control unit 90 supplies a number of drive pulses corresponding to the target throttle opening θ to the step motor 7, and sets the opening of the throttle valve 6 to the target throttle opening θ.

A specific configuration from the throttle-by-wire control section 30 to the motor drive control section 90 is shown in FIG.

First, the throttle-by-wire 30 includes an accelerator pedal position sensor 31 and a target air amount calculation section 32.

The accelerator pedal position sensor 31 is connected to the accelerator pedal 20
For example, a potentiometer is used to detect the depression position IAp, and outputs a signal at a voltage level corresponding to the depression position Ap.

The target air amount calculation unit 32 stores the data shown in FIG. 3 as a function as a condition for determining the intake air amount A/Nt according to the accelerator pedal position Ap, and uses this function and the detected depression position 1i1iAp. From target intake air amount A/N
t 1 is calculated and determined.

The traction control unit 40 includes a differentiator 41 that calculates the vehicle body acceleration from the driven wheel speed vr, and a reference drive shaft that can be transmitted to the road surface from the vehicle body acceleration determined by the differentiator 41, the vehicle weight W, and the wheel diameter R that are stored in advance. A reference drive shaft torque calculation unit 42 that calculates torque Two, a reference engine output torque calculation unit 43 that calculates a reference engine output torque Tea from the reference drive shaft torque Two calculated by this calculation unit 42,
Reference air i to obtain reference intake air m A / No from the reference engine output TeO calculated by this calculation unit 43
t calculation unit 44, a subtraction unit 45 that calculates the slip EiDV (=Vr - Vr) by subtracting the driven wheel speed ■ from the driving wheel speed V; the slip fi obtained by this subtraction unit 45;
A PID regulator 46 that calculates the feedback operation amount ΔA/N (air amount) from the DV, this PID regulator 46
The reference intake air amount A is set using the operation amount ΔT obtained as the correction amount.
The target intake air amount ff1A/N t 2 is determined based on the reference intake air amount A/No and by feedback of the slip amount DV.

Here, the reference engine output torque calculation unit 43 calculates the reference drive shaft torque T<i>0 by considering the gear ratio ρ of the transmission 13 and the torque ratio τ of the torque converter 11 as shown in the following equation. This is to calculate the reference engine output torque Tea required for

Tco-Two/ (ρr) The reference air amount calculation unit 44 stores the relationship shown in FIG. 4 between the intake air amount A/N and the engine output Te as a map (correspondence table). The reference intake air H corresponding to the above reference engine output torque Tea based on
This is to find kA/No. Note that it is of course possible to store the relationship shown in FIG. 4 as a mathematical formula and use that formula to calculate the reference intake air amount A/No.

The auto cruise control unit 50 includes a target vehicle speed determining unit 51 that determines the driven wheel speed vr when the auto cruise mode is set by the auto cruise switch 60 as the target vehicle speed Vt, and a target vehicle speed determined by the target vehicle speed determining unit 51. V
a subtraction unit 52 that calculates a speed deviation ΔV by subtracting the driven wheel speed V' from t; a PID regulator 53 that calculates a feedback operation amount ΔA/N (air amount) from the speed deviation ΔV obtained by the subtraction unit 52; It consists of an adding section 54 that adds the operation amount ΔA/N obtained by this PID controller 53 to the intake air amount A/Nr as a correction amount, and
The target intake air 11 A / N t * is determined based on N r and by feedback of the speed deviation ΔV.

The target intake air mA/N t , A/Nj2 . A/N
An air amount selection section 71 that selects and outputs one of tq in response to a command from a selection control section 74, which will be described later.Target intake air JIIA/Nt selected by this selection section 71, engine rotation speed Ne, and intake air amount A target opening calculation unit 72 that calculates the target throttle opening θ from A/Nr, and a target intake air amount A/Nr.
Nt1°A/Nt2. An air amount comparison section 73 that compares the values of A/N t , and the comparison result of this comparison section 73 and the operation of the auto cruise 60 and the traction control section 4
a selection control section 74 that controls the selection operation of the selection section 71 according to the driving mode based on the value of the slip WDV at 0;
Consisting of

The target opening calculation unit 72 calculates the target intake air amount A/N t based on the relationship shown in FIG. 5 between the intake air jlA/N and the throttle opening using the engine speed Ne as a parameter.
The target throttle opening degree θ corresponding to the target throttle opening degree θ is calculated.

In addition, the target opening calculation unit 72 feeds back the intake air jl A / N r as a correction amount when calculating the opening in order to correct the deviation in the intake air amount due to the error in the throttle valve position. There is.

A specific example of this target opening calculation section 72 is shown in FIG.

As shown in FIG. 6, target intake air jlA/Nt is supplied to a target throttle opening calculation section 701 and a subtraction section 702.

The target throttle opening calculation unit 701 calculates the target intake air amount A
/Nt and the engine rotational speed Ne to calculate the target throttle opening degree θt.

The subtraction unit 702 calculates the target intake air amount A/Nt and the intake air M.
The deviation from kA/Nr is calculated, and the deviation becomes the feedback operation amount Δθ (opening degree j1) in the Pl adjuster 703. Then, this operation amount Δθ is added to the target throttle opening θ[ by an adding section 704, so that the final target throttle opening θ is obtained.

Next, the operation of the above configuration will be explained with reference to FIG.

When the accelerator pedal 20 is depressed, the depression level is 1fAp.
is detected by the accelerator pedal position sensor 31.

At this time, the target intake air fl according to the depression position Ap
A/N t t is calculated by the target air amount calculation section 32 , and the target intake air amount A/N t 1 is supplied to the main control section 70 .

In addition, the traction control unit 40 subtracts the driven wheel speed Vf from the driving wheel speed V to obtain the slip amount DV, and determines the target intake air Jil A at which the slip can be converged.
/ N t 2 is calculated.

That is, the vehicle acceleration is determined from the driven wheel speed V, and the reference drive shaft torque Two that can be transmitted to the road surface is calculated from the vehicle acceleration, the vehicle weight W, and the wheel diameter R that are stored in advance. Calculate the reference engine output torque Tea necessary to obtain the drive shaft torque Two by considering the gear ratio ρ of the transmission 13 and the torque ratio τ of the torque converter 11, and calculate the reference engine output torque Tea necessary to obtain the reference engine output torque Two. Target intake air amount A/No.
Calculate. At the same time, from the driving wheel speed V' to the driven wheel speed v
The slip amount DV (-Vr - Vf) is obtained by subtracting r, and the feedback operation amount ΔA/N (air m) is obtained from the slip iDV. Then, the obtained operation amount ΔA/N is added as a correction amount to the reference intake air amount A/No to obtain the target intake air amount A/Nt2.

This target intake air ff1A/Nt2 is supplied to the main control section 70.

The auto cruise control unit 50 monitors the state of the auto cruise switch 60 and
When 0 is operated and auto cruise mode is set,
The driven wheel speed vf at that time is determined as the target vehicle speed Vt. Furthermore, the driven wheel speed V'' is subtracted from the determined target vehicle speed V to obtain a speed deviation ΔV, and the feedback operation amount ΔA/N is obtained from the speed deviation ΔV. Then, the obtained operation amount ΔA/N is corrected. Intake air jlA/N as the amount
, and calculate the target intake air ff1A/N t .

This target intake air 12A/N t is determined by the main control unit 70
is supplied to

Note that the auto cruise control unit 50 detects when the auto cruise switch 60 is operated again to cancel the auto cruise mode, or when the brake pedal or accelerator pedal 20 of the vehicle is depressed, and sets the target vehicle speed Vt. cancel the decision.

On the other hand, the main control section 70 receives the target intake air amount A/Nt1. A/Nt2. The values of A/Nt3 are compared with each other. In addition, the traction $ control section 40
If the slip JiDV is above a certain value, set the traction mode cTRc wind mode
Traction mode is not set when is below a certain value. Furthermore, it is determined whether the auto cruise mode (ASC mode) is set by the auto cruise switch 60.

If the main control section 70 satisfies the conditions that the mode is neither traction mode nor autocruise mode, the target intake air amount A/N t of the throttle-by-wire control section 30 is selected.

When the target intake air j7A/Ntx is selected, its l;
A target throttle opening degree θ required to obtain a standard intake air amount A/N t is calculated based on the engine rotational speed Ne and the intake air amount A/N r.

When the target throttle opening θ is calculated, the step motor 7 is driven according to the calculation result, and the throttle valve 6 is set to the target throttle opening θ.

In this way, the drive shaft torque corresponding to the depression position Ap of the accelerator pedal 2o is transmitted to the drive shaft 14, and becomes a driving force at the wheels 15.

In addition, in the main control unit 70, if the condition that the mode is not the traction mode but the auto cruise mode is established, the target intake air jl of the auto cruise control unit 50 is set.
A/Ntq is selected.

When the target intake air ff1A/N t 3 is selected, the target throttle opening degree θ is calculated in the same manner as described above.

Then, the throttle valve 6 is set to the target opening degree θ.

In this way, the drive shaft torque required for constant speed running is reduced to the drive shaft 1.
4, and the vehicle travels at a constant speed at the target vehicle speed Vt.

However, during this constant speed driving, if the auto cruise mode is canceled by re-operating the auto cruise switch 60, or if the brake pedal or accelerator pedal 20 is depressed, which corresponds to the auto cruise mode cancellation command, the target Intake air ff1A/N t
The selection of 3 is canceled and constant speed driving ends.

Furthermore, if the traction mode is set in the main control section 70 and the condition that the value of the target intake air amount A/Nt of the traction familiarization section 40 is not the maximum is satisfied, that is, the target intake air amount A/Nt is not the maximum value. If the condition that the value of Nt2 is smaller than any one of the other target intake air JiIA/Nt, . . . A/Nt3 is satisfied, the target intake air ff1A/Nt2 is selected.

In other words, the phenomenon in which the value of the target intake air amount A/Nt2 decreases is due to the occurrence of slip;
The target intake air amount A/Nt2 is selected to ensure safety.

When the target intake air amount A/N t 2 is selected, the target throttle opening degree θ is calculated in the same manner as described above.

Then, the throttle valve 6 is set to the target opening degree θ.

In this way, the drive shaft torque that can reduce the slip is transmitted to the drive shaft 14, and the slip is reduced.

However, even in the trough silane mode, if the value of the target intake air 11A/Nt2 is the maximum, that is, if no slip occurs, the target intake air 11A/Nt, depending on the presence or absence of the auto cruise mode, Alternatively, the target intake air m A /N t 3 is selected.

In this way, by unifying the throttle-by-wire control, traction 11gg, and auto-cruise control using a common element, the target intake air mA/Nt, the configuration for determining the throttle opening θ can be used for each control. Can be done.

Therefore, throttle-by-wire control and traction control can be performed without increasing the size of the device.

and auto-cruise control can all be integrated as a drive-by-wire system device.

Furthermore, the target intake air ff1A/Nti for each control.

Since A, /N t 2 and A / N t 3 are selected according to the magnitude of each value and the operation mode, each control can be performed without complicating the opening control for the throttle valve 6. You can bring out its full functionality. In other words, it is possible to ensure improved safety through traction control.

In the above embodiment, the throttle valve is driven by a step motor, but it may be driven not only by a step motor but also by a DC motor. In that case, a throttle opening sensor is provided to detect the opening of the throttle valve. Then, the DC motor is driven so that the detected opening matches the target throttle opening θ. Further, although the motor is used, hydraulic drive or pneumatic drive may be used.

In addition, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made without changing the gist.

[Effects of the Invention] As described above, according to the present invention, there is provided a means for determining the target intake air amount A/N t 1 according to the operation amount of the accelerator, and a means for determining the target intake air amount A/N t 1 in accordance with the operation amount of the accelerator, and a means for determining the target intake air amount ji at which wheel slip can be converged.
i A / N t 2, a means for determining the target intake air amount A / N t 3 necessary for constant speed running, and these target intake air amounts A/Ntl, A/N t 2
, A/N t3, and means for selecting one of the three depending on the operation mode, and means for controlling the opening degree of the throttle valve in accordance with the target intake air amount selected by this means. Therefore, it is possible to integrate the accelerator-by-wire control, traction control, and auto-cruise control into an engine without increasing the size of the device or complicating the opening control for the throttle valve. Output control device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention and the configuration of a vehicle related thereto, FIG. 2 is a diagram specifically showing the configuration of the main part of FIG. 1, and FIG. 3 is a diagram showing the goals of the embodiment. FIG. 4 is a diagram showing the conditions for determining the amount of intake air; FIG. 4 is a diagram showing data used to calculate the reference engine output in the same embodiment; FIG. 5 is a diagram showing data used to calculate the throttle opening in the same embodiment; The figure is a diagram specifically showing the configuration of the target opening calculation section in the same embodiment, and FIG. 7 is a flowchart for explaining the operation of the same embodiment. 4...Engine body, 6...Throttle valve, 30.
... Throttle-by-wire control section, 40... Traction control section, main control section, 50... Auto cruise control section, O... Motor drive control section. 0...

Claims (1)

[Claims] In a vehicle in which the intake air amount of an engine is adjusted by a throttle valve and the engine output based on the intake air amount is transmitted to a drive shaft, there is provided a means for determining a target intake air amount A/Nt_1 according to an accelerator operation amount; Means for determining the target intake air amount A/Nt_2 at which slip can be converged, means for determining the target intake air amount A/Nt_3 necessary for constant speed driving, and these target intake air amounts A/Nt_1, A/Nt.
_2, A/Nt_3 according to the operating mode; and means for controlling the opening degree of the throttle valve according to the target intake air amount selected by this means. Characteristic engine output control device.