JPH0485161A - Traction controller for vehicle - Google Patents

Abstract

PURPOSE:To secure the traveling stability of a vehicle by prohibiting motion of a control prohibiting means if accelerator opening is less than the specified opening and driving wheel speed is faster than the reference one at a time when the control prohibiting means prohibits traction control. CONSTITUTION:A car traction control controller 20 prohibits any execution of traction control under the condition that driving wheel speed is slower than the reference speed, and if this driving wheel speed is faster than the reference one opening of a main throttle valve 8 is beyond the reference opening, in the case where a manual switch 50 is ON state and a prohibiting command of the traction control is performed by a car driver. While if the driving wheel speed is faster than the reference one and the opening of the main throttle valve is less than the reference one, it is so judged that a car is running on a low mu road, whereby the traction control is performed. Accordingly, in the case where the car enters the low mu road and the driving wheel gets slipping at time of prohibiting the traction control, this traction control is executed and thereby traveling stability in the car is thus securable.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an acceleration slip control device for a vehicle that suppresses acceleration snop of drive wheels that occurs when a vehicle accelerates, and more specifically, the present invention relates to an acceleration slip control device for a vehicle that suppresses acceleration snop of drive wheels that occurs when a vehicle accelerates. The present invention relates to a vehicle acceleration slip control device that can be set arbitrarily by a person.

[Prior Art] Conventionally, acceleration has been used to control the rotational speed of the drive wheels so that the frictional force acting between the drive wheels and the road surface is maximized by suppressing the acceleration slip that occurs in the drive wheels when the vehicle accelerates. Slip control devices are known.

Also, for this type of device (for example, Japanese Patent Application Laid-Open No. 60-1431
As described in Publication No. 71, a manual switch is provided to externally set the execution/non-execution of slip control to maximize vehicle performance, such as drifting and spin turns, which actively utilize the slip of the drive wheels. Some are designed to respond to requests from drivers who want to drive in a relaxed manner.

[Problems to be Solved by the Invention] However, in this type of device, when the driver operates a manual switch to prohibit the execution of slip control, the friction coefficient μ is relatively large (hereinafter referred to as a high μ road). ), it is possible to drift and turn the vehicle even if the vehicle enters a corner, etc., but on a road surface with a small coefficient of friction μ (hereinafter referred to as a low μ road), even a slight acceleration operation will cause the drive wheels to It is possible that the engine is idling.

Therefore, the present invention (1) enables slip control to be executed to ensure vehicle running stability when the vehicle enters a low μ road, even if slip control is prohibited by operating a manual switch. It was done with the purpose of making it possible.

[Means for Solving the Problems] That is, the present invention, which has been made to achieve the above object, comprises a driving wheel speed detecting means for detecting the driving wheel speed, and a vehicle body speed detecting means for detecting the vehicle body speed, as illustrated in FIG. a detection means; a control means for calculating the slip amount of the drive wheels that occurs during vehicle acceleration based on the drive wheel speed and the vehicle body speed, and controlling the rotation of the drive wheels so that the slip amount becomes a predetermined slip amount; and an external operation. Acceleration slip control for a vehicle, comprising: a manual switch for inputting a command to stop the operation of the control means; and a control inhibiting means for prohibiting the operation of the control means when the command to stop the operation is input from the manual switch. The device includes an accelerator opening detection means for detecting an accelerator opening of an internal combustion engine that drives the drive wheels, and when an operation stop command is input from the manual switch, when the accelerator opening is below a predetermined opening and control prohibition release means for prohibiting the operation of the control prohibition means and operating the control means when the drive wheel speed is equal to or higher than a reference speed set based on the vehicle body speed. The gist of this paper is an acceleration slip control system for a vehicle, which is characterized by:

[Function] In the acceleration slip control device of the present invention configured as described above, when an operation stop command is input from the outside via the manual switch, the control inhibiting means executes the acceleration slip control. In addition, when the control prohibition means prohibits acceleration slip control due to the operation stop command 1: The accelerator opening is below the predetermined opening and the drive wheel speed is above the reference speed set based on the vehicle speed. Be it (
The melon control prohibition canceling means prohibits the operation of the control prohibiting means and causes the control means to execute acceleration slip control.

In other words, in the present invention (even if the driver of the companion vehicle operates a manual switch to prohibit the execution of acceleration slip control), the acceleration request of the vehicle driver is determined from the accelerator opening degree, and the acceleration slip control is prohibited. If the driving wheel speed exceeds the reference speed even though the vehicle driver has not requested acceleration (it is assumed that slipping is occurring on a low μ road), acceleration slip control is executed. It is.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

First, FIG. 2 is a schematic configuration diagram showing the overall configuration of an acceleration slip control system according to an embodiment in which the present invention is applied to a front engine rear drive (FR) vehicle using an internal combustion engine 2 as a power source.

As shown in the figure, a sub-throttle valve 10 is provided in the intake passage 4 of the internal combustion engine 2 in addition to the main throttle valve 8, which is opened and closed in conjunction with the accelerator pedal 6. The throttle valve] 0 is configured to open and close to control the output torque of the internal combustion engine 2 to execute acceleration slip control.

Normally, the sub-throttle valve 10 is controlled to be fully open. When acceleration slip occurs, 1 mm. Acceleration slip control circuit 2
It is opened and closed via the drive motor 22 in response to a control signal output from the drive motor 22. Further, the sub-throttle valve 10 and the main throttle valve 8 are provided with a sub-throttle opening sensor 24 and a main throttle opening sensor 26, respectively, for detecting their openings. The opening/closing control of the sub-throttle valve 10 can be executed while checking the opening degrees of the throttle valves 8 and 10.

In addition, the rotation of the internal combustion engine 2 is transmitted to the left and right rear wheels (drive wheels) 36 via a propeller shaft 32° differential gear 34.
A drive wheel speed sensor 42 as a drive wheel speed detection means for detecting the drive wheel speed VR from the rotation of the other output shaft is provided in the transmission 38 that transmits data to the left and right front wheels (driven wheels) 36FL and 36RR. , 36FR (driven wheel speed sensor 44FL for inspecting each other's rotational speed,
Equipped with 44FR. In addition, driven wheel speed sensor 44F
This is for calculating the average value of the rotational speeds of the left and right driven shafts 36FL and 36FR as the vehicle speed VS, and corresponds to vehicle speed detection means.

Acceleration slip control circuit 20 (friend CPU, ROM.

The sub-throttle valve 10 is configured by a well-known microcomputer consisting of a RAM, etc., and detects acceleration slip of the driving wheels 36RL and 36RR based on the detection signals from the above-mentioned sensors. A well-known acceleration slip control process is executed in which the output torque of the internal combustion engine 2 is controlled by opening and closing.

Further, a manual switch 50 operated by the vehicle driver is connected to the acceleration slip control circuit 20, and depending on the operating state of the manual switch 50, acceleration slip control is executed or disabled. It also executes control prohibition processing that switches execution.

This control prohibition process will be explained below with reference to the flowchart of FIG. Note that this control prohibition process is executed at predetermined time intervals in the acceleration slip control circuit 20, separately from the acceleration slip control described above.

As shown in FIG. 3, in the acceleration slip control process, first in step 100, it is determined whether or not the manual switch 50 is in the ON state and the vehicle driver has issued an instruction to inhibit acceleration slip control. Then, the manual switch 50 is turned OFF.
In the F state, if the vehicle driver has not issued an instruction to prohibit acceleration slip control, the control execution flag FON is reset in step 110, and the control permission flag FTR is set in the subsequent step 120, and the process is temporarily terminated. do.

Furthermore, the control execution flag FON (@1: is set when the manual switch 50 is in the ON state and the vehicle driver has issued a prohibition command for acceleration slip control through the process described later), and when execution of acceleration slip control has been permitted. This flag is used to instruct the control permission flag FTR to execute or non-execute acceleration slip control. The control is executed, and if the control permission flag FTP is reset, the execution of the acceleration slip control is stopped.

Next, in step 100, when it is determined that the manual switch 50 is in the ON state and the vehicle driver has issued an instruction to inhibit acceleration slip control, the process proceeds to step 130.
It is determined whether the control execution flag FON is in a reset state. If the control execution flag FON is in the reset state, the process moves to the following step 140, and the driving wheel speed sensor 4
2, the driving wheel speed VR detected by the driven wheel speed sensors 44FL and 44FR is set by adding or multiplying a predetermined value to the vehicle body speed vS obtained based on the detection signals from the driven wheel speed sensors 44FL and 44FR. S) By determining whether or not the driving wheel is slipping, it is determined whether the driving wheel is slipping or not, and when it is determined that the driving wheel speed VR is smaller than the reference speed VTH and the driving wheel is not slipping,
Proceeding to step 150, execution of acceleration slip control is prohibited by resetting the control permission flag FTR, and the process is temporarily terminated.

On the other hand, in step 140, the driving wheel speed VR is set to the reference speed V.
If it is determined that slip has occurred in the drive wheels at TH or above, the process moves to the following step 160, where the opening degree θ of the main throttle valve 8 detected by the main throttle opening degree sensor 26 is checked. It is determined whether the opening degree is less than or equal to a preset reference opening degree θTH. In this embodiment, the main throttle valve 8 is linked with the accelerator pedal 6, so the opening θ of the main throttle valve 8 corresponds to the accelerator opening, and the main throttle opening sensor 26 is connected to the accelerator pedal. Corresponds to opening detection means.

Then, in step 160, if it is determined that the opening degree θ of the main throttle valve 8 exceeds the reference opening degree θTH, the vehicle driver intentionally turns the drive wheels to perform drift driving, spin turns, etc. The vehicle is slipping due to high μ
Assuming that the vehicle is traveling on the road, the process moves to step 150 described above.

On the other hand, if it is determined in step 160 that the opening degree θ of the main throttle valve 8 is equal to or less than the reference opening degree θTH,
It is determined that the vehicle driver is not intentionally causing the drive wheels to slip and the vehicle is traveling on a low μ road, and the process proceeds to step 170. Then, in step 170, the control execution flag FO
N and reset the timer counter T in the subsequent step 180, and then in step 120 set the control permission flag FTR regardless of the ON state of the manual switch 50 to execute acceleration slip control. Terminate the process once.

Next, in step]30, if it is determined that the control execution flag FON is set, that is, when the manual switch 50 is in the ○N state and the vehicle driver has issued an instruction to prohibit acceleration slip control, When execution of acceleration slip control is permitted in the process of step 140 described above, the process proceeds to step 190, and by incrementing the timer counter T, the time during which execution of acceleration slip control is permitted is counted. In the following step 200,
By determining whether the value of the timer counter T has exceeded a predetermined value Ta, it is determined whether the predetermined time has elapsed. Then, in step 200, if it is determined that the value of the timer counter T is smaller than the predetermined value Ta and the execution permission time of acceleration slip control has not elapsed for the predetermined time, the process is temporarily terminated and the timer counter T is
If it is determined that the value of is greater than or equal to the predetermined value Ta and the execution permission time of the acceleration slip control has exceeded the predetermined time, it is assumed that the slip of the driving wheels has been suppressed by the acceleration slip control, and the control execution flag FON is set in step 210. After resetting the control permission flag FTR in step 150, the process is temporarily terminated.

As explained above, in the vehicle acceleration slip control device of this embodiment, when the manual switch 50 is in the ON state and the vehicle driver issues an instruction to prohibit acceleration slip control, Acceleration slip control is executed under the conditions that the driving wheel speed VR is smaller than the reference speed VTH, and that the opening θ of the main throttle valve 8 exceeds the reference opening θTH. Prohibited, even if the drive wheel speed VR is above the reference speed VTH and the opening degree θ of the main throttle valve 8 is less than the reference opening degree θT)I (it is determined that the vehicle is running on a low μ road). , to perform acceleration slip control.

Therefore, if the vehicle enters a low μ road and the drive wheels begin to slip while the vehicle driver has prohibited acceleration slip control,
It is possible to ensure the running stability of the vehicle and improve safety.

In the above embodiment, an acceleration slip control device that controls the rotation of the drive wheels by opening and closing the sub-throttle valve 0 to suppress the output torque of the internal combustion engine 2 was explained as an example, but the ignition timing retard control device Alternatively, an acceleration slip control device that suppresses the output torque of the internal combustion engine 2 by reducing the amount of fuel supplied, etc. An acceleration slip control device that directly controls the rotation of the drive wheels by driving a brake device installed on the drive wheels; The present invention can also be applied to an acceleration slip control device that controls the rotation of drive wheels by a combination of various controls.

[Effects of the Invention] As detailed above, in the acceleration slip control device of the present invention, even if the vehicle driver operates the manual switch to prohibit execution of acceleration slip control, the accelerator opening is below a predetermined opening degree and the drive wheel speed is above a reference speed, it is assumed that the drive wheels are slipping on a low μ road and acceleration slip control is executed.

For the second reason, according to the present invention, when the vehicle enters a low μ road and the drive wheels begin to slip while the vehicle driver has prohibited acceleration slip control, acceleration slip control is executed. , it becomes possible to ensure the running stability of the vehicle.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating the configuration of the present invention, FIG. 2 is a schematic configuration diagram showing the overall configuration of an acceleration slip control device according to an embodiment, and FIG. 3 shows a control prohibition process executed in an acceleration slip control circuit. A flowchart representing, is. 2... Internal combustion engine 6... Accelerator pedal 8...
・Main throttle valve 10...Sub throttle valve 20...Acceleration slip control circuit 22...Drive motor 26...Main throttle opening sensor 36RL, 36RR...Drive wheels 36FL, 36FR...Sub Driving wheel 42... Drive wheel speed sensor 44... Driven wheel speed sensor 5o... Manual switch Fig. 2 6FL bRL Fig. 1

Claims (1)

[Claims] Drive wheel speed detection means for detecting the drive wheel speed, vehicle body speed detection means for detecting the vehicle body speed, and calculating the slip amount of the drive wheels that occurs when the vehicle accelerates based on the drive wheel speed and the vehicle body speed. a control means for controlling the rotation of the drive wheel so that the slip amount becomes a predetermined slip amount; a manual switch for inputting an operation stop command for the control means by external operation; and an operation from the manual switch. an acceleration slip control device for a vehicle, comprising: a control inhibiting means for prohibiting operation of the control means when a stop command is input; means, when the operation stop command is input from the manual switch, when the accelerator opening is below a predetermined opening and the driving wheel speed is above a reference speed set based on the vehicle speed; An acceleration slip control device for a vehicle, comprising: a control prohibition canceling device that prohibits the operation of the control prohibition device and operates the control device.