JP2521045B2 - Anti-lock control method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antilock control method for a vehicle, which is equipped with a drive system capable of directly connecting four-wheel drive and a cross pipe type two-system antilock control braking device, When the drive system of the vehicle is a direct-coupled four-wheel drive, it is possible to realize control with high stability and good control efficiency.

[Background of the Invention]

In the cross piping type two-system antilock system, when the drive system of the vehicle is in the direct-coupled four-wheel drive state, the interference of the wheels in each system occurs, the antilock control does not operate normally, and a so-called "jerky feeling" is generated. ", Or the tail of the vehicle may be shaken, and the directional stability may be deteriorated.

[Object of the Invention]

The present invention effectively avoids the above-mentioned problems such as "jerky feeling" and swinging of the tail of the vehicle in the cross piping type two-system anti-lock control system when the drive system of the vehicle is in the direct four-wheel drive state. While ensuring high stability,
An object of the present invention is to provide an antilock control method capable of realizing excellent braking efficiency.

[Structure of the Invention] In the anti-lock control method of the present invention, in the cross piping type two-system anti-lock control system, when the drive system of the vehicle is in the direct-coupled four-wheel drive state, left and right rear wheels are selected low and left and right. Lock determination is performed based on the select low with each front wheel.

〔The invention's effect〕

According to the present invention, it is possible to reduce the influence of the front and rear wheels on each other during control, thereby realizing smooth control, and moreover, one of the front and rear wheels that has a greater control force dependency affects the smaller side. Even in the system, braking efficiency can be improved.

〔Example〕

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

Referring first to FIG. 1, there is shown a braking device to which the present invention can be applied. In this figure, FR, FL, RR,
RL is a front right wheel, a front left wheel, a rear right wheel, and a rear left wheel, respectively.
1 is a brake pedal, 2 is a master cylinder, 3 _FR ,
3 _FL , 3 _RR , and 3 _RL are the right front wheel FR, left front wheel FL, and right rear wheel R, respectively.
R is a wheel cylinder of the brake device for the left rear wheel RL. This brake system is equipped with a right front wheel wheel cylinder 3 _FR
And the left rear wheel wheel cylinder 3 _RL are connected via a pipe 4a, and the left front wheel wheel cylinder 3 _FL and the right rear wheel wheel cylinder 3 _RR are connected via a pipe 4b to form a so-called cross piping type dual system. ing. Although not shown,
The front shaft and the rear shaft of each wheel can be directly connected to the drive system.

Further, in FIG. 1, 5 _FR , 5 _FL , 5 _RR , and 5 _RL are wheel speed detectors (speed sensors) provided in association with the right front wheel FR, the left front wheel FL, the right rear wheel RR, and the left rear wheel RL, respectively. ), And
These speed sensors input detection information to the control circuit 6. The control circuit 6 can be generally configured by using a microcomputer, and in the present invention, the control circuit 6 is configured to include the constituent elements shown in the chain line block 6 in FIG. 2, respectively. Reference numerals 7a and 7b are modulators each including a gate valve, a pressurizing valve, a depressurizing valve, etc. The master cylinder 2 connects the right front wheel wheel cylinder 3 _FR and the left rear wheel wheel cylinder 3 _RL via the modulators 7a and 7b. The pipe 4a and the left front wheel wheel cylinder 3 _FL and the right rear wheel wheel cylinder 3 _RR are connected to the pipe 4b. These modulators 7a
And 7b are controlled by a signal from the control circuit 6 during the antilock control operation to perform an operation such as pressurization, depressurization or pressure retention for each wheel cylinder.

According to the present invention, as shown in FIG. 2, the control circuit 6 includes row select circuits 8a, 8b and 8c and logic circuits 9a and 9b. It should be noted that the configuration shown in FIG. 2 is for the case where the drive system is a direct-coupled four-wheel drive, and in the case of two-wheel drive (FF), any other appropriate configuration can be adopted. Is. In addition, in FIG. 2, portions corresponding to FIG. 1 are indicated by the same reference numerals as those in FIG. In the control circuit 6, the right rear wheel speed sensor 5 _RR and the left rear wheel speed sensor 5 _RL are respectively connected to the two input terminals of the row select circuit 8a, and the output of this row select circuit 8a is the other two row select signals. Connected to one input terminal of each of circuits 8b and 8c,
The right front wheel speed sensor 5 _FR and the left front wheel speed sensor 5 _FL are connected to the other input terminals of these two row select circuits 8b and 8c, respectively. Row select circuit 8b
Logic circuits 9a and 9b are connected to the output sides of and 8c, respectively.

According to the configuration of the present invention described above, the left and right rear wheels are selected low by the low select circuit 8a, and the selected low and the right front wheel and the left front wheel are selected by the low select circuit.
Select lows are made at 8b and 8c, respectively, and lock determination is made at the logic circuit 9a or 9b based on the select low.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a cross piping type two-system braking device to which the present invention can be applied, and FIG. 2 is a block diagram showing a configuration for carrying out the method of the present invention. In the drawing, FR is the right front wheel, FL is the left front wheel, RR is the right rear wheel,
RL is the left rear wheel, 1 is a brake pedal, 2 is a master cylinder, 3 _{FR to} 3 _RL is a wheel cylinder, 4a and 4b are cross pipes, 5
_FR to 5 _RL Speed sensor, 6 control circuit, 7a, 7b are modulators, 8a to 8c show low-select circuit, 9a, 9b is a logic circuit.

Claims (1)

(57) [Claims] 1. An antilock control method for a vehicle, comprising a drive system capable of direct drive four-wheel drive and a cross pipe type two-system antilock control brake device, wherein the drive system is in a direct drive four-wheel drive state. The anti-lock control method is characterized in that the lock determination is performed based on the select low of the left and right rear wheels and the select low of the left and right front wheels.