JP2777943B2 - Inspection method for traction control and differential limiting mechanism of automobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traction control and a differential control mechanism for controlling the rotation of wheels in accordance with the rotational speed difference between the front and rear wheels and between the left and right wheels. The present invention relates to an inspection method for inspecting a function and an inspection apparatus used for performing the method.

[0002]

2. Description of the Related Art Traction control calculates a slip ratio of a driving wheel from a rotational speed difference between a driven wheel, which is one of the front and rear wheels of a vehicle, and a driving wheel, which is the other wheel, and drives the vehicle such that the slip ratio falls within a predetermined range. Conventionally, as an inspection method of such traction control, according to Japanese Utility Model Laid-Open No. 63-84444,
Each wheel of the automobile is put on each roller of the inspection device, the accelerator pedal is depressed so that each roller can rotate independently, and traction control is performed based on the rise value of the rotation speed of the drive wheel roller within a predetermined time. There has been known an apparatus that determines the quality of a product. Further, the above publication discloses that the accelerator pedal is depressed in a state where one of the left and right driving wheel rollers is braked, and the rotational speed of the other driving wheel roller is increased based on a rise value within a predetermined time. A method of determining pass / fail is also described.

[0003]

In the above-described traction control inspection, a difference in rotation speed between a driving wheel and a driven wheel (which does not rotate) occurs when the accelerator pedal is depressed, and the traction control is functioning normally. This is a method that focuses on the point that the increase in the speed of the drive wheel is suppressed and the rise value of the rotation speed of the drive wheel roller within a predetermined time becomes equal to or less than a predetermined value. The same is true. However, even if the traction control or the differential limiting mechanism does not function properly, the rise value of the roller rotation speed within a predetermined time may be less than a predetermined value depending on how the accelerator pedal is depressed. In such a case, it is determined to be acceptable, and the determination becomes inaccurate. In view of the above, an object of the present invention is to improve the accuracy of inspection of a traveling control function such as a traction control or a differential limiting mechanism.

[0004]

In order to achieve the above object,
According to a first aspect of the present invention, the inspection of the traction control functions to control the rotation of the drive wheel in accordance with the rotational speed difference between the drive wheels and the driven wheels of a motor vehicle, the place the slave wheel 1 There use an inspection device comprising a roller and a second roller carrying a driving wheel, the depression of the accelerator pedal
A state in which the driving wheels are driven to drive the car on the inspection device
In the method performed in the first run, the first roller and the second roller are connected to each other so that both rollers rotate synchronously ,
When the rotation speed of the first roller and the rotation speed of the second roller both increase to a predetermined speed, the connection between the two rollers is released to reduce the speed of the first roller, and the speed of the first roller during this speed reduction is reduced. The quality of the traction control is determined from the correlation between the rotation fluctuation and the rotation fluctuation of the second roller.
According to the second aspect of the present invention, the inspection of the differential limiting mechanism provided between the right and left drive wheels of a motor vehicle, put the first roller and the other driving wheel to put the left right one drive wheel There use an inspection apparatus and a second roller, the accelerator pedal Stepping
Drive the driving wheels to drive the car on the inspection device
In the method in which the first roller and the second roller are initially connected to each other so that both rollers rotate synchronously , the rotation speed of the first roller and the rotation speed of the second roller are initially set . When both have risen to the predetermined speed, the connection between the two rollers is released and the first roller is decelerated. From the correlation between the rotation fluctuation of the first roller and the rotation fluctuation of the second roller during this deceleration, The quality of the differential limiting mechanism is determined.

[0005]

When the first roller is decelerated, a rotational speed difference is generated between the first and second rollers, that is, between the wheels mounted on both rollers, so that a traction control or a differential limiter is provided.
Rotation of the wheels placed on the second roller by the action of configuration are controlled, the rotational speed of the second roller varies with a predetermined correlation according to the change in the rotational speed of the first roller. In the present invention, the traction control is performed by observing the correlation between the rotation fluctuation of the first roller and the rotation fluctuation of the second roller.
In order to judge the quality of the wheel or the differential limiting mechanism , the traction must be maintained regardless of whether the degree of depression of the accelerator pedal varies in each test or the degree of deceleration of the first roller varies.
Quality of the control or differential limiting mechanism can be accurately determined.

[0006]

FIG. 1 shows an inspection apparatus for inspecting a traction control and a differential control mechanism of a motor vehicle and a running control function and an anti-lock brake. The inspection apparatus includes a pair of left and right rollers 11 ₁ and 1 for front wheels. ₁ and a pair of left and right rollers 1 for the rear wheel
_2, 1 ₂ and includes a gearbox 3 ₁ obtained by connecting respective roller 1 ₁ between the rollers 1 _1, 1 ₁ of a pair of front wheel via a respective clutch 2 _1, a pair of rear wheel roller 1 _2, 1 ₂ between every two rollers 1 ₂ via a respective clutch 2 ₂ place the gearbox 3 ₂ coupled to, and linked via a connecting shaft 4 both gearbox 3 _1, 3 _2, When the vehicle is run with each wheel on each roller, if the front wheel is a driving wheel, the roller 1
₁ and clutch 2 ₁ and the gear box 3 ₁ and rear wheels serving driven wheel via a connecting shaft 4 and the gearbox 3 ₂ and the clutch 2 ₂ and roller 1 ₂ is rotated, when the rear wheels are driving wheels, The front wheels are rotated on the reverse system. Roller 1 ₁ for the front wheels, 1 ₁ on the fixed stand 5, and roller 1 ₂ for the rear wheels,
1 ₂ is provided on the moving freely sliding table 6 back and forth, and telescopic structure with a spline shaft 4b of fitting the rear portion of the connecting shaft 4 to the sleeve 4a, the movement of the sliding table 6 and adapted to adjust the distance between the rollers 1 ₁ and the rear-wheel roller 1 ₂ for the front wheels in accordance with the wheelbase of the car by.

[0007] Each of rollers 1 _1, 1 _2, the front and rear pair linked via a belt 7 so as to synchronize the rotation split roller 1
a, is composed of 1b, connects the flywheel 8 on the rollers 1 _1, 1 ₂ of the rear of the split roller 1b, a tachometer and a torque meter between the divided roller 1b and the flywheel 8 The detection means 9 is provided, and a signal from the detection means 9 is input to a monitor device 10 composed of a microcomputer to perform various tests described later. Further, consists brake for applying a braking force at least one of a pair rollers 1 _1, 1 ₁ of the front wheel, the roller 1 _2, 1 ₂ each flywheel 8 on at least one of the pair of rear wheel Braking means 11 ₁ and 11 ₂ are provided. Next, the inspection of the traction control, the inspection of the differential limiting mechanism, and the inspection of the antilock brake by the inspection device will be described in order. Note that the vehicle is a front wheel drive type.

[0008] (I) carrying the wheels of the inspection vehicle traction control to each roller 1 _1, 1 _2, the operator of the motor vehicle on the roller by depressing the accelerator pedal in a state of connecting the respective clutches 2 _1, 2 ₂ Let it run. In this case, the drive wheels serving front wheel rotation even rear wheel is transmitted from the roller 1 ₁ to the roller 1 ₂ in a system path of the serving driven wheel rotating synchronously with the front wheels and the constant velocity. The roller 1 _1, 1 ₂ of the rotational speed and the front wheel roller 1 ₁ and the rear-wheel roller 1 ₂ off the clutch 2 ₁ of the front wheel roller 1 ₁ was raised to a predetermined speed independently of each other to rotate and as to be in, to actuate the brake means 11 ₂ of the rear-wheel roller 1 ₂ and in Figure 2 the roller 1 ₂ is decelerated as indicated by a line. According to this, a difference in rotation speed is generated between the front wheel and the rear wheel, and the traction control works, and the slip ratio λ = (V ₁ −) obtained from the rotation speed V _{1 of the} front wheel and the rotation speed V _{2 of the} rear wheel. V ₂ ) / V ₁ is a predetermined set value λ1
Output control of the engine is performed so as to maintain the is decelerated with a predetermined correlation according to the front wheel i.e. the front-wheel roller 1 ₁ is deceleration of the rear wheel roller 1 ₂ as shown by line b in FIG. 2 You. In this case, front-wheel rollers 1 ₁ have to work the traction control is not decelerated as shown by line c in FIG. 2, also traction control front wheel roller 1 ₁ is excessively as indicated by the d-line in FIG. 2 when malfunction Slow down.
Then, to calculate the slip ratio lambda based on the rotational speed signal from the detection means 9 in the monitoring device 10, the slip rate within a predetermined measurement time t during deceleration of the rear wheel roller 1 ₂ lambda is the set value λ1 It is determined whether or not the value falls within a predetermined allowable range as a reference. According to this, as long as the degree of depression of the accelerator pedal is kept constant during the transition to the constant speed running state, even if the degree of depression of the accelerator pedal varies in each inspection, the reduction of the rear wheel roller is also possible. Even if the speed varies, it can be accurately determined whether the traction control is functioning properly.

When the vehicle is accelerated on a rough road such as a gravel road, the acceleration force tends to be stronger when the drive wheels are idling appropriately, and a vibration change peculiar to the rough road appears in the rotation speed of the driven wheels. At times, the set value of the slip ratio λ may be changed to a second value λ2 larger than the above value λ1, and traction control for rough roads for relaxing the engine output control and improving the acceleration efficiency may be performed. In the automotive making such rough road for traction control, by intermittently operating the braking means 11 ₂ at the time of deceleration of the rear wheel roller 1 _2, to generate a rotational vibration of the rear wheel roller 1 ₂ as shown by a line in FIG. 3 When,
Deceleration degree of the front wheel roller 1 ₁ as shown by line b is relieved slip ratio λ increases in FIG. Accordingly, a first allowable range entered by which whether a normal traction slip rate in the rear-wheel roller 1 _second rotational vibration generating before a predetermined examination time in t1 lambda is based on the first set value λ1 Whether the control is good or bad and whether the slip ratio λ within a predetermined inspection time t2 at the time of occurrence of the rotational vibration has increased to a value within a second allowable range based on the second set value λ2 is determined. The quality of the road traction control is determined.

(II) Inspection of the Differential Limiting Mechanism In order to inspect the differential limiting mechanism incorporated in the differential gear between the left and right front wheels as driving wheels, the vehicle is run on the rollers as described above, and the left and right front wheels are driven. use roller 1 _1, 1 both said rollers 1 ₁ of the rotational speed was reached predetermined speed _1, 1 ₁ of each of the clutch 2 _1, 2 one front wheel roller 1 with ₁ the cut
Braking _one by operation of the braking means 11 _1. At this time, the differential limiting torque is generated in accordance with the rotation speed difference between the left and right front wheels by the operation of the differential limiting mechanism, torque acts via one front wheel topped thereto on one of the rollers 1 ₁ to be braked I do. Then, while measuring the front wheel roller 1 _1, 1 ₁ of the rotational speed difference between the left and right, the torque acting on one of the rollers 1 ₁ to be braked is measured and generated by the measured rotational speed difference differential limiting mechanism Is compared with the measured torque to judge the quality of the differential limiting mechanism.

[0011] (III) in the case of performing the inspection of the inspection antilock brake antilock brake, the rotational speed of all the rollers 1 _1, 1 ₂ as described above is Upon reaching a predetermined speed, for the rear wheels and front wheel Turn all the rollers 1 _1, 1 ₂ of the clutch 2 _1, 2 _2, quality as the brakes pedal, described later on the basis of the signal from the torque meter provided in the monitoring device 10 to the detecting means 9 of the rollers in this state Make a decision. FIG. 4 shows a change in the torque T detected by the torque meter provided in the detecting means 9, a change in the wheel rotation speed V, a change in the wheel deceleration ν, and a change in the brake when the antilock brake normally operates. 5 shows changes in pressure P.
The anti-lock brake stops increasing the brake pressure when the wheel deceleration ν exceeds a predetermined set value vs, and the wheel speed V is set to a reference speed V determined according to a required deceleration characteristic.
s, the brake pressure is reduced when the deceleration ν falls below the set value vs, and the brake pressure is increased when the wheel speed V exceeds the reference speed. It functions to repeat the operation of. Torque T
Changes in response to the deceleration ν, and a peak appears in the waveform according to the brake pressure increase / decrease control. When the roller is stopped, the elastic energy stored in the inertial system including the wheel, the roller, and the flywheel is released, and the deceleration ν and the torque T temporarily lower to zero level or less. Then, the monitor device 10 calculates the time taken from the time when the torque T becomes equal to or more than the predetermined threshold level T ₀ to the time when the torque T decreases to be equal to or less than the zero level as the braking time tB. The number of peaks and the peak value of the generated torque T are calculated, and the quality of the antilock brake is determined based on whether or not the braking time tB, the number of peaks, and the peak value are within allowable ranges, respectively. In the figure, TL and TH indicate the lower limit and the upper limit of the allowable range of the peak value.

The friction coefficient of the outer peripheral surfaces of the divided rollers 1a and 1b constituting the rollers 1 ₁ and 1 ₂ is determined by the friction force acting between the wheel and the divided rollers 1a and 1b during braking. 8 is set to a large value exceeding the inertial force of each of the divided rollers 1a and 1b. Therefore, the rollers 1 _1, 1 ₂ at the time of braking rotating at which a constant speed without slipping relative to each wheel, the rollers 1 _1, 1 ₂ of the deceleration detected by each torque meter Thus each Matches the wheel deceleration. Further, both split rollers 1a,
1b, the inertia weight of the belt 7, each roller including a flywheel 8 1 _1, 1 _2, a predetermined level necessary to initiate the deceleration ν wheel during braking anti-lock control (deceleration of the reference speed Vs) It is set to a predetermined value which can be increased as described above and before the first pressure reduction of the brake pressure by the anti-lock control is completed, preferably such that the wheel does not stop even if the brake pressure is increased after the first pressure reduction, Thus, the brake pressure is reduced and increased at least once, and a peak appears in the torque T.

By the way, in the above-described embodiment, the rear wheel roller 1 _{2 as a} driven wheel is used in the traction control inspection.
The it was to be forcibly decelerated by the braking unit 11 _2, cut the front roller 1 ₁ of the clutch 2 ₁ or / and the rear wheel roller 1 ₂ clutch 2 _2, the braking means 11 ₂ without operating the rear wheel roller 1 ₂ may be caused to the natural deceleration. Further, as shown in FIG. 5, interposed the viscous coupling 12 to the connecting shaft 4 between the front wheel roller 1 ₁ and the rear-wheel rollers 1 _2, upon examination of the traction control, the clutch 2 _1, 2 ₂ and a braking means 11 ₂ is operated without cutting, may be caused to decelerate the rear wheel roller 1 _2. According to this, when solving the operation of the inspection after the braking means 11 _2, and power is transmitted to the rear wheel roller 1 ₂ through the viscous coupling 12, and the rear wheel placed on this and the roller 1 ₂ The speed is increased so as to be the same speed as the front wheels, and the traction control re-test and the anti-lock brake test can be performed continuously.

[0014]

As is apparent from the above description, according to the present invention, the quality of a traction control or a differential limiting mechanism for controlling the rotation of a wheel according to the rotation speed difference between the wheels is determined by determining whether or not one of the wheels is good. By observing the correlation between the rotation fluctuation and the rotation fluctuation of the other wheel, there is an effect that the determination can be made accurately without being affected by variations in the degree of depression of the accelerator pedal.

[Brief description of the drawings]

FIG. 1 is a plan view of an example of the inspection apparatus of the present invention.

FIG. 2 is a diagram showing rotation fluctuation of front and rear wheels by traction control.

FIG. 3 is a diagram showing rotation fluctuations of front and rear wheels due to traction control for rough roads.

FIG. 4 is a diagram showing a torque waveform and changes in wheel speed, wheel deceleration, and brake pressure when the antilock brake operates normally.

FIG. 5 is a plan view of another embodiment of the inspection apparatus of the present invention.

[Explanation of symbols]

1 ₁ and 1 ₂ rollers 2 ₁ and 2 ₂
Clutch 4 Connecting shaft 9 Detecting means 10 Monitor circuit (judging means) 11 ₁ , 11 ₂ Braking means 12 Viscous coupling

Continuation of the front page (72) Inventor Masaru Maruo 1-10-1 Shinsayama, Sayama-shi, Saitama Honda Engineering Co., Ltd. (56) References JP-A 1-214731 (JP, A) JP-A 1-191031 (JP, A) JP-A-5-187967 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01M 17/00-17/06

Claims (2)

(57) [Claims] The method according to claim 1. A traction control acts to control the rotation of the drive wheel in accordance with the rotational speed difference between the drive wheels and the driven wheels of the vehicle inspection, the drive wheel and the first roller to put the slave wheel There use an inspection apparatus and a second roller to put, drives the drive wheels by depression of the accelerator pedal
In this method, the first roller and the second roller are connected to each other so that both rollers rotate synchronously at the beginning of travel, and the rotational speed of the first roller is changed. When both the rotation speeds of the first and second rollers rise to a predetermined speed, the first roller is decelerated by releasing the connection between the two rollers, and the rotation fluctuation of the first roller and the second roller during this deceleration are reduced. A method for inspecting traction control of an automobile, comprising determining whether the traction control is good or bad from a correlation with a rotation fluctuation of the vehicle. Wherein the inspection of the differential limiting mechanism provided between the right and left drive wheels of a motor vehicle, the inspection apparatus and a second roller to put the first roller and the other driving wheel to put one of the driving wheel left right There use, and driving the drive wheels by depression of the accelerator pedal
In a method in which the first roller and the second roller are connected to each other so that both rollers rotate synchronously at the beginning of the traveling, the first roller and the second roller are connected to each other so that the first roller is driven . When both the rotation speed and the rotation speed of the second roller rise to a predetermined speed, the connection between the two rollers is released to reduce the speed of the first roller. And determining whether the differential limiting mechanism is good or not based on a correlation with the rotation fluctuation of the roller.