SU1290129A1 - Device for checking stability of vehicle during braking - Google Patents

Abstract

This invention relates to a device for monitoring vehicle stability when braking. The purpose of the invention is to increase the functionality and accuracy of the control. The device contains sensors 1, 2 of braking forces connected to analog switches 3, 4, the outputs of which are connected to the inputs of blocks 5, 6, sampling and storage. In addition, the output of the blocks 5, 6 through the keys 7 and 8 are connected to the inputs of the divisible blocks 9 and 10 of the division. The outputs of the blocks 5, 6 are connected to the inputs of the adder 11, the output of which is connected to the input of the block 12 for sampling and storing. The output of block 12 through the key 13 is connected to the adder 14 of sequential action. The adder 14 is connected to one input of the multiplication unit 15, to the other input of which the setting device 16 is connected. The block 15 is connected to the same input of the adders 17 and 18, to the other inputs of which the setting devices 19 and 20 are connected; The outputs of the adders 17 and 18 are connected § (L

Description

1290

to the inputs of the divider units 9 and 10 division, the outputs of which are connected to the decoder 21, connected to the block 22 of the display. The pulse generator 23 is connected to the information input of the key 24, to the permitting input of which the brake start sensor 25 is connected, and to the prohibitory input - a sensor 26 reaching the threshold pressure level. Key 24 is connected to

one

The invention relates to the transport engineering and operation of wheeled vehicles, namely, devices for testing and monitoring their brake system.

The purpose of the invention is to enhance the functionality and increase

accuracy of control.

The drawing shows the block diagram of the device for monitoring the stability of the vehicle during braking.

The device contains sensors 1 and 2 of braking forces, the outputs connected respectively to the information inputs of the first and second analogue cells, of which 3 and 4, the outputs of which are connected to the inputs of the first and second blocks 5 and 6 of sampling and storing respectively, the outputs of which the third and fourth analog switches 7 and 8, respectively, are connected to the inputs of the divisible first and second blocks 9 and 10 of the division. The outputs of the first and second blocks 5 and 6 of sampling and storage are respectively connected to the inputs of the first adder 11, the output of which is connected to the input Tpe of the second block 12 of sampling and storage. The output of the block 12 via the fifth analog key 13 is connected to the input of the second adder 14 of the series. The output of the adder 14 is connected to one of the inputs of the multiplication unit 15, to the other input of which the setter 16 is connected. The unit 15 is connected to the first inputs of the third and fourth adders 17 and 18 to its second input, the connectors 29

the counter 27 connected via a decoder 28 to block 22. The device determines the dynamic loads on the wheels during braking according to the value of the total braking force, determines the blocking order of the vehicle wheels by dynamic values and compares it with the allowable ones. 1 il.

Adjusters 19 and 20. The outputs of the third and fourth adders 17 and 18 are connected to the inputs of the divider of the first and second blocks 9 and 10 of the division, the outputs of which are connected to the inputs of the first decoder 21. The output of the decoder 21 is connected to the display unit 22. The pulse generator 23 is connected to the information input of the additional key 24 by its output, to the permit input of which the brake start sensor 25 is connected, and to the prohibitory input - a sensor 26 reaching the threshold pressure level. The key 24 with its output is connected to the input of the counter 27, the output of which through the second decoder 28 is connected to the display unit 22.

The device works as follows.

With the help of potentiometric sensors 1 and 2, the braking forces measured by the left and right wheels of the controlled axle of the vehicle being tested on the stand are measured. When the braking forces reach maximum values, the analog switches 3 and 4 switch the signals of sensors 1 and 2 to the inputs of the lines of blocks 5 and 6 of the sample and memory, made in the form of electrolytic capacitors with a mash loss tangent, in which the values of the maximum braking forces of the wheels are remembered. The indicated voltage values are added by the first adder 11, and the resulting amount, characterizing the axial braking force, is stored in a line of sampling and memorizing blocks 12, performed similarly to blocks 5 and 6.

312

Then, these operations are repeated for all checked axes of the vehicle, after which the fifth analog key 13 sequentially commutes the voltage levels corresponding to axial braking forces from the line of sampling and storing blocks 12 to the adder 14, where they are sequentially added. The total voltage obtained in adder 14, which characterizes the total braking force of the vehicle, is fed to the input of multiplication unit 15, where it is multiplied with the voltage value set by setpoint 16 (which is a precision potentiometer) from a reference voltage source. The set voltage level characterizes the value of h / 2L, where h is the height of the center of mass of the vehicle; L is its base.

Obtained in block 15 level on

the voltage goes to the inputs of the adders 17 and 18. The second input of the third adder 17 receives the voltage from the setting device 19, performed similarly to the block 17. This voltage corresponds to the value of the static load on the front wheel, i.e. at the output of the third adder 17, a voltage level is obtained corresponding to the dynamic load on the front wheel of the vehicle during braking:

7 п + 2.-Ь 2L

where Z is the dynamic load on

front wheel in the process of braking;

G - static load on the front wheel; RO - total brake force. The second input of the fourth adder 18 is inputted using the setting device 20, which is made similarly to the sensor 16, a voltage whose value corresponds to the static load on the rear wheel. Thus, at the output of the fourth adder 18, a voltage level is obtained corresponding to the dynamic load on the rear wheel of the vehicle during braking:

Z G - 2 2L

5 5 0

five

five

0

with Q g

294.

where Z is the dynamic load on the rear wheel during braking;

G - static load on the rear wheel.

The voltage levels obtained in adders 17 and 18, corresponding to the values of dynamic loads on the vehicle's wheels during braking, arrive at the first inputs of dividing blocks 9 and 10, the second inputs of which by means of analog switches 7 and 8 alternate the devices 5 and 6 sampling and storing the magnitude of the stresses characterizing the braking forces of the left and right wheels of the respective axes. At the outputs of blocks 9 and 10 dividing, the voltage levels corresponding to the dynamic specific braking forces of the wheels are obtained:

, l.o P, l.o / z ,. .

where - dynamic specific torus

Mozna force of the left or right wheel of the i-th axis;

1lp braking force of the left or right wheel of the i-th axis.

Through the first decoder 21, information about the obtained values of dynamic specific braking forces of the wheels is fed to the display unit 22, made in the form of a digital scoreboard or in the form of a digital printing device.

Simultaneously with the control of the braking forces, the response time of the axle drive is measured. According to the signal of the contact sensor 25, the start of braking installed on the brake pedal, the additional key 24 transmits pulses generated by the generator 23 of pulses to the counter 27. When the set pressure value is reached in the brake actuator, the threshold sensor 26 reaches the pressure level and closes the additional key 24 and stops the flow of pulses to the counter 27. In the second decoder 28 by the number of pulses recorded by the counter 27 during the time from the moment you depress the brake pedal to reaching the set yes phenomena in the drive, the response time of the brake drive of the checked axis is determined, which is displayed by the display unit 22.

If the response time of the vehicle's brake drive axles is within acceptable limits, then the order of wheel locking during braking is controlled by the values of dynamic specific braking forces of the wheels, and those wheels whose dynamic specific braking forces are longer are blocked.

Claims (1)

Claim 1 A device for monitoring vehicle stability when braking, containing braking force sensors, adders, dividing units, display unit, characterized in that, in order to expand the functionality and increase the accuracy of control, it is equipped with analog keys, sampling and memorizing units multiplication, sensors, decoders, a brake start sensor, a sensor, reaches neither a threshold pressure level, an additional key, a pulse generator, or a counter, while the braking force sensors es the first and second analog switches are connected to the inputs of the first and second sampling blocks and the storing, the outputs of which are connected to the inputs of the first summatoRedaktor A. Lezhnina Compiled by S. Makarov Tehred L. Oleiik Co Po 7891/37 Circulation 799 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 0 five 0 Pa and through the third and fourth analog keys to the first inputs of the dividing units, the output of the first adder is connected to the input of the third sampling and storage unit, the output of which is connected via the fifth analog key to the input of the second sequential adder, the output of which is connected to the first input of the multiplication unit, to the second input of which the first control device is connected and the output of the multiplication unit is connected directly to the first input of the third adder and to the first input of the fourth adder, to the second input of the third adder a second master is connected, and a third master is connected to the second input of the fourth adder, the outputs of the third and fourth adders are connected to the second inputs of the dividers, the outputs of which are connected to the display unit through the first decoder, the brake start sensor and the sensor for reaching the threshold pressure level are connected to the additional key inputs , the output of the pulse generator through an additional key is connected to the input of the counter, the output of which is connected to the display unit through the second decoder. Proofreader T. Kolb Subscription