JPH0719077A - Throttle control method - Google Patents

Abstract

PURPOSE:To restrain excessive throttle opening when a brake is operated in an electronic throttle control device. CONSTITUTION:When a brake pedal 19 is stepped down to a stepping-down quantity of an accelerator pedal 3 or output opening T corresponding to demands from the other control devices 8 and 28, the increase is restricted. Thereby, fuel consumption can be restrained to excessive operation of the accelerator pedal 3 when a brake is operated, and a load to the brake is reduced, and the occurrence of fading can be restrained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control in a throttle control device which is mounted on an automobile, electrically measures a depression amount of an accelerator pedal, and controls a throttle valve opening of an internal combustion engine according to the depression amount. Regarding the method.

[0002]

2. Description of the Related Art In recent years, a so-called electronic throttle or a throttle-by-wire system, which electrically measures the amount of depression of an accelerator pedal as described above and controls the throttle valve opening in accordance with the amount of depression, is called Such throttle control devices have been installed in some automobiles.
By using this throttle control device, for example, at the time of gear shifting of the transmission, the throttle valve opening is adjusted separately from the driver's operation of the accelerator pedal, so that the rotational speeds of the input and output shafts of the clutch are made equal to each other, and the gear shift shock is Can be reduced.

In such a throttle control device,
In a typical conventional technique, the target opening of the throttle valve is determined in response to a request from another control device, for example, the control device of the transmission or the control device of the internal combustion engine, together with the depression amount of the accelerator pedal. It

[0004]

On the other hand, the clutch operation is no longer necessary due to the spread of automatic vehicles.
Some drivers have operated the brake pedal with their left foot in order to eliminate mistakes in pedaling. Further, even in a manual shift vehicle, some drivers operate the accelerator pedal together with the brake pedal with their right foot in order to shorten the braking distance and improve the acceleration performance after braking.

Therefore, in the prior art as described above, the accelerator pedal may be excessively depressed, which may lead to deterioration of fuel consumption and brake fade.

An object of the present invention is to provide a throttle control method capable of suppressing unnecessary accelerator operation for brake operation.

[0007]

SUMMARY OF THE INVENTION The present invention is a throttle control method for driving and controlling a throttle valve so that a target opening degree corresponding to the depression amount of an accelerator pedal is obtained. The throttle control method is characterized in that, when deceleration is detected, the target opening is limited to a predetermined opening corresponding to the deceleration of the vehicle body.

Further, according to the present invention, in a throttle control method for driving and controlling a throttle valve so that a target opening corresponding to an amount of depression of an accelerator pedal is obtained, depression of a brake pedal is detected and deceleration of a vehicle body is predetermined. A throttle control method is characterized in that, when it is detected that the value is equal to or more than a value, the target opening is prevented from increasing with respect to a change in the depression amount of the accelerator pedal.

Furthermore, the present invention is a throttle control method for driving and controlling a throttle valve so that a target opening degree corresponding to a depression amount of an accelerator pedal is obtained, and depression of a brake pedal is detected and deceleration of a vehicle body is detected. In this case, the throttle control method is characterized in that the throttle valve is prohibited from opening faster than a maximum opening speed of the throttle valve which is predetermined corresponding to the deceleration rate of the vehicle speed.

[0010]

According to the present invention, when the target opening of the throttle valve is obtained from the depression amount of the accelerator pedal, the target opening is limited when the brake operation is being performed.

That is, according to the present invention, when it is detected that the brake pedal is depressed and the vehicle body is decelerating, the target opening is predetermined in correspondence with the deceleration of the vehicle body. Limit the opening.

Further, according to the present invention, when the depression of the brake pedal is detected and it is detected that the deceleration of the vehicle body is equal to or more than a predetermined value, the change in the accelerator pedal depression amount with respect to It is prohibited to increase the target opening. That is, the increase of the target opening degree by depressing the accelerator pedal is prohibited, and only the decrease of the target opening degree by returning the accelerator pedal is permitted.

Further, according to the present invention, when the depression of the brake pedal is detected and the deceleration of the vehicle body is detected, the maximum opening speed of the throttle valve which is predetermined corresponding to the deceleration rate of the vehicle body is higher than the maximum opening speed. Prohibit opening of the throttle valve. That is, even if the accelerator pedal is depressed faster than the maximum opening speed corresponding to the deceleration rate of the vehicle body, the opening speed of the throttle valve is limited to the maximum opening speed.

Therefore, according to each of the inventions, the target opening degree of the throttle valve can be limited to improve the fuel consumption and the load on the brake when the accelerator pedal is excessively depressed while the brake pedal is being operated. It is possible to suppress the occurrence of the fade by suppressing.

[0015]

1 is a block diagram showing an electronic throttle control device 1 according to an embodiment of the present invention and a configuration related thereto. The controller 1 controls the motor 4 according to the amount of depression of the accelerator pedal 3 read by the accelerator sensor 2.
Is controlled to adjust the opening degree of the throttle valve 7 interposed in the intake pipe 6 of the internal combustion engine 5. Ie, for example,
When the accelerator pedal 3 is stepped on, the opening degree of the throttle valve 7 is increased, whereby the vehicle speed is increased, and when it is input from the automatic transmission control device 8 to shift up via the line 9. The throttle valve 7 is temporarily returned to make the input and output rotational speeds of the clutch of the automatic transmission 10 substantially equal to each other, thereby realizing the shift operation with less shift shock.

Therefore, the control device 1 includes a battery 11
, The output voltage of the accelerator sensor 2, and the output voltage of the throttle opening sensor 12 are input and given to the analog / digital converter 21, respectively. The accelerator sensor 2 and the throttle opening sensor 12 are realized by so-called slide resistance and generate output voltages corresponding to the depression amount of the accelerator pedal 3 and the opening of the throttle valve 7, respectively. The voltage from the battery 11 is applied to the circuits in the sensors 2 and 12 and the control device 1 after being stabilized at a constant level by the constant voltage circuit 22. The analog / digital converter 21 converts the above input signal into a digital value at a predetermined cycle, for example, every 4 msec, and inputs the conversion result to a processing circuit 23 realized by a so-called microcomputer or the like.

In the present invention, the output from the brake switch 20 is input to the control device 1. The brake switch 20 conducts when the brake pedal 19 is depressed, and its output is waveform-shaped by the input interface circuit 25 in the control device 1 and input to the processing circuit 23.

The processing circuit 23 is based on the input from the analog / digital converter 21, the input from the brake switch 20 via the input interface circuit 25, and the input via the line 9, as will be described later. The opening target value T of the throttle opening sensor 1 is calculated.
The actual opening of the throttle valve 7 detected by 2 is
The motor 4 is drive-controlled via the output interface circuit 24 so that the opening target value T is obtained.

An electromagnetic clutch 13 is interposed between the motor 4 and the throttle valve 7, and an electromagnetic clutch 14 is interposed between the accelerator pedal 3 and the throttle valve 7. These electromagnetic clutches 13 and 14 are
Processing circuit 23 through the output interface circuit 24
When the electronic throttle control device 1 is in a normal state, the processing circuit 23 conducts the electromagnetic clutch 13, disconnects the electromagnetic clutch 14, and drives the throttle valve 7 by the motor 4. To do. Further, for example, when the amount of depression of the accelerator pedal detected by the accelerator sensor 2 does not change for a predetermined time or longer when the vehicle is running, it is determined that an abnormality has occurred in the electronic throttle control device 1. Then, the electromagnetic clutch 13 is cut off and the electromagnetic clutch 14 is conducted,
The throttle valve 7 is directly connected to the accelerator pedal 3 to realize fail safe.

On the other hand, the automatic transmission 10 detects the vehicle speed sensor 16 provided in association with the driven gear in the automatic transmission 10, and the throttle opening sensor 12 input through the line 9 as a result of detection. The automatic transmission 1 is controlled by the automatic transmission control device 8 so that the optimum shift speed is achieved in accordance with the detection result of the shift lever 17 and the position of the shift lever 17.
The solenoid valve in 0 is switch-controlled to transmit the output of the internal combustion engine 5 to the wheels 18.

Furthermore, the internal combustion engine 5 is operated based on the intake pressure detected by the intake pressure sensor 26 provided in the intake pipe 6 and the rotational speed NE of the internal combustion engine 5 detected by the crank angle sensor 27. Engine control device 28
The fuel injection amount and ignition timing are controlled by. The internal combustion engine control unit 28 also temporarily sets the ignition timing when the automatic transmission control unit 8 inputs via the line 9 a shift to a gear stage having a small gear ratio, that is, so-called upshifting. And the torque generated by the internal combustion engine 5 is reduced.

In the electronic throttle control device 1 configured as described above, when driving the throttle valve 7, the processing circuit 23 first reads the depression amount A of the accelerator pedal detected by the accelerator sensor 2 and the line. From the automatic transmission control device 8 via the vehicle speed sensor 1
The vehicle speed Vs detected by 6 is read. For each vehicle speed Vs read in this way, the target opening degree TA set in advance as indicated by lines α1 to α4 in FIG. 2 is read. This target opening degree TA corresponds to a non-linear relationship when the vehicle speed is low as indicated by reference numeral α1, and becomes close to linear as the vehicle speed increases as indicated by reference numerals α2, α3, .... Is set to. Further, in FIG.
Reference numeral 5 indicates a direct connection state of the accelerator pedal 3 in which the electromagnetic clutch 14 is conducted.

Next, the target opening TB corresponding to the request from the other control devices 8 and 28, for example, to suppress the traction when the automatic transmission 10 is upshifted.
Is read via line 9. The target openings TA and TB thus obtained are compared, and the lower opening is set as the output opening T of the throttle valve 7.

Further, in one embodiment of the present invention, when the brake pedal 19 is depressed, the deceleration of the vehicle body is calculated, and an upper limit value of the target opening which is predetermined corresponding to the deceleration, for example, is calculated. When the deceleration is 5 km / h / sec, it is 45 degrees, and when the output opening T obtained as described above is larger, the output opening T is corrected to this upper limit value.

FIG. 3 is a flow chart for explaining the operation of one embodiment of the present invention. In step n1, the depression amount A of the accelerator pedal 3 detected by the accelerator sensor 2 is read. In step n2, the vehicle speed Vs is read from the automatic transmission control device 8 via the line 9. In step n3, the corresponding target opening degree TA is read from the values obtained in steps n1 and n2 based on the graph shown in FIG.

At step n4, a request from another control device 8, 28 is received via the line 9, and at step n5, the target opening TB corresponding to the request is calculated. In step n6, the target opening degrees TA and TB obtained in steps n3 and n5 are compared, and the smaller value is selected, for example, and the actual output opening degree T is set in step n7. In this way, the output opening degree T corresponding to the depression amount A of the accelerator pedal 3, the vehicle speed Vs, and the demands from the other control devices 8 and 28.
Is calculated, the process moves to step n8.

In step n8, the brake switch 20
It is determined from the detection result of step S9 whether the brake pedal 19 is depressed, and if so, the process proceeds to step n9 to calculate the deceleration ΔV of the vehicle speed Vs.

This deceleration ΔV is obtained from the difference between the current value Vsi of the vehicle speed Vs detected in step n2 and the value Vso which is 1 sec earlier, for example.
The main routine shown in FIG. 3 is, for example, 4
It is performed every msec, and therefore the value Vso is set to the previous value by 25 calculation cycles. Further, this value Vs is subjected to a filtering process by being subjected to a smoothing process in which a predetermined number of data is set in the control device 8, for example, an average value of data for 8 calculation cycles. Similarly, each sensor 2, 12
It is assumed that the above-described smoothing process is also performed on the detection result of 1 to reduce noise and detection error.

At step n10, the opening upper limit Tmax of the throttle valve 7 corresponding to the deceleration ΔV is calculated. In step n11, the output opening T is the opening upper limit T
It is determined whether or not max is exceeded, and if so, the output opening T is set to the opening upper limit Tmax in step n12, and then control output is performed in step n13. If not, such correction is performed. If not, the output opening T determined in step n7 remains unchanged, and the process directly moves from step n11 to n13 to perform control output. Further, in step n8, even when the brake pedal 19 is not depressed, the process directly goes to step n13, and the control output is performed at the output opening T of step n7.

FIG. 4 is a flow chart for explaining the operation of another embodiment of the present invention. This embodiment is similar to the above-mentioned embodiment, and the corresponding portions bear the same reference numerals.
In this embodiment, the deceleration ΔV obtained in step n9
Is determined in step n21 to be greater than the predetermined value ΔVmax, and if so, step n21
Move to 22. In step n22, it is determined whether or not the output opening T obtained in step n7 is larger than the previous opening To, and if so, the output opening T is set to the previous opening To in step n23. After that, the process proceeds to step n13, in which the deceleration Δ
When V is less than or equal to the value ΔVmax, and step n2
2 and the output opening T is less than or equal to the previous opening To,
The process directly moves to step n13. Therefore, the deceleration Δ
When V is larger than the value ΔVmax, the throttle valve 7
Is prohibited to control in the opening direction.

FIG. 5 is a flow chart for explaining the operation of still another embodiment of the present invention, and the portions corresponding to the above-mentioned embodiment are designated by the same reference numerals. In this embodiment, when the deceleration ΔV is calculated in step n9, the process proceeds to step n31, and the maximum opening speed ΔTmax of the throttle valve 7 corresponding to the deceleration ΔV is calculated. Further, in step n32, the opening speed ΔT is calculated from the difference between the current output opening degree T obtained in step n7 and the previous control output opening degree To. In step n33, it is determined whether or not the opening speed ΔT is larger than the maximum opening speed ΔTmax, and if so, the value obtained by adding the maximum opening speed ΔTmax to the previous control output opening degree To is determined in step n34. After the actual control output opening T is set to, the process proceeds to step n13, where the opening speed ΔT is the maximum opening speed ΔT.
When it is less than or equal to max, the process directly moves to step n13. That is, when the throttle valve 7 is opened at a speed exceeding the maximum opening speed ΔTmax set corresponding to the deceleration ΔV, the opening speed ΔT is limited to the maximum opening speed ΔTmax to open the next control output. Determine the degree T.

As described above, according to each embodiment of the present invention, when the brake pedal 19 is depressed, the control output opening T of the throttle valve 7 with respect to the depression amount A of the accelerator pedal 3 is limited. The fuel consumption can be suppressed, and the load on the brake can be suppressed to suppress the occurrence of fade.

[0033]

As described above, according to the present invention, when the target opening of the throttle valve is obtained from the depression amount of the accelerator pedal, the target opening is limited when the brake operation is being performed. When the accelerator pedal is excessively depressed while the pedal is being operated, the target opening of the throttle valve can be limited to improve fuel efficiency, and the load on the brake can be suppressed to prevent the occurrence of fade. .

[Brief description of drawings]

FIG. 1 is an electronic throttle control device 1 according to an embodiment of the present invention.
FIG. 3 is a block diagram of a configuration related to the above and FIG.

FIG. 2 is a graph showing a relationship of a target opening degree TA of a throttle valve 7 with respect to a depression amount A of an accelerator pedal 3.

FIG. 3 is a flowchart for explaining the operation of the embodiment of the present invention.

FIG. 4 is a flow chart for explaining the operation of another embodiment of the present invention.

FIG. 5 is a flow chart for explaining the operation of still another embodiment of the present invention.

[Explanation of symbols]

 1 Electronic Throttle Control Device 2 Accelerator Sensor 3 Accelerator Pedal 4 Motor 5 Internal Combustion Engine 7 Throttle Valve 8 Automatic Transmission Control Device 10 Automatic Transmission 12 Throttle Opening Sensor 13, 14 Electromagnetic Clutch 19 Brake Pedal 20 Brake Switch 23 Processing Circuit 28 Internal Combustion Engine control device

Claims (3)

[Claims] 1. A throttle control method for driving and controlling a throttle valve so that a target opening degree corresponding to an amount of depression of an accelerator pedal is obtained. When depression of a brake pedal is detected and deceleration of a vehicle body is detected, A throttle control method characterized in that the target opening is limited to a predetermined opening corresponding to the deceleration of the vehicle body. 2. A throttle control method for driving and controlling a throttle valve so that a target opening corresponding to the amount of depression of an accelerator pedal is obtained. When depression of a brake pedal is detected and deceleration of a vehicle body is equal to or greater than a predetermined value. A throttle control method, characterized in that when the presence of the accelerator pedal is detected, the target opening degree is prevented from increasing with respect to a change in the depression amount of the accelerator pedal. 3. A throttle control method for driving and controlling a throttle valve so that a target opening degree corresponding to a depression amount of an accelerator pedal is obtained. When depression of a brake pedal is detected and deceleration of a vehicle body is detected, A throttle control method characterized in that the throttle valve is prohibited from opening faster than a maximum opening speed of the throttle valve which is predetermined corresponding to the deceleration rate of the vehicle speed.