SU1659260A1 - Antilock vehicle brake system - Google Patents

Abstract

This invention relates to a vehicle and can be used in vehicles with an air brake system. The purpose of the invention is to increase the braking efficiency. The system controls the wheel braking, the modulus of the braking torque depending on the ratio of the measured angular velocity of the wheel, the calculated derivative of the angular velocity and the specified threshold values and the same parameters. The system contains a wheel speed sensor 14, a compressed air pressure modulator 3 in the brake chambers 4 and an electronic control device including a signal converter 15 from a sensor 14 to the analog wheel speed, a differentiator 16, comparators 18 and 17 slowing down and acceleration deceleration settings, pulse formation units 22, main 21 and additional 23 control signals, pulse control signal correction block 26, blocks 24 and 25 of identifying high and low values of the coefficient of tangles and switching element 20 in the power supply circuit of the solenoid valve 7 of the modulator 3. 4 Cp. f-ly. 22 il.

Description

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Claims (5)

Claim 1. Anti-lock braking system of the vehicle, containing 13 1659250 source of compressed air connected via a pressure valve of the modulator pressure to the brake chamber, a brake valve that communicates the source of compressed air with a pneumatic control input 5 of the modulator, in the body of which there is an electromagnetic valve for selective communication of the control chamber of the relay valve with a control input or atmosphere, a valve for limiting the temperature of 10 Pa to increase the pressure in the control chamber during repeated braking, located between the pneumatic control inlet and the electromagnet valve, the pneumatic memory capacity, which communicates with the control chamber through a non-return valve and a throttle hole, and with a pneumatic control input - through a non-return valve, the wheel angular velocity sensor with a frequency to voltage converter, the output of which is connected to the input of the control device, which includes forming units main and pulse signals for brake release, the outputs of which are connected to a switching element in the power supply circuit of the electromagnetic valve, which means that, in order to In order to increase braking efficiency, the control device is equipped with a differentiator, two comparators, a second comparator setpoint correction block, an additional brake control signal generating unit, low and high clutch coefficients identification blocks and a pulse control signal correction block, with one input of the main control block the control signal and the inputs of the setpoint correction unit of the differentiator and the low clutch identification unit 40 are connected to the frequency-to-voltage converter runs, the output of the setpoint correction block goes to the correcting input of the second comparator, the output of the differentiator 45 goes to the information inputs of the comparators and the high clutch identification block, the output of the main control signal generation block is connected to the first input 50 of the pulse control signal correction block and to the first input of the additional control signal generating unit, and the input, together with the second input of the unit and the first input of the pulse generating unit 55 the control signal to the output of the second comparator, the second input of the pulse control signal correction block and the third input of the additional control signal generating block are connected to the output of the low clutch identification block, the output of the pulse control signal correction block is connected to the second input of the pulse control signal generating block, connected by the output to the third input of the correction unit, the fourth input of the additional control signal generating unit is connected to the output a first comparator, to the output of the fifth unit identifying high coupling coefficient, and an output - to the input of the switching element. 2. The system of pop. 1, characterized 15 in that the block for generating an additional control signal for disengaging includes an integrator with a variable time constant connected by information inputs to the outputs of the main control signal, an identification block for low adhesion coefficients and an identification block for high adhesion coefficients, as well as a comparator and a signal cancellation unit for braking with small signals of acceleration and deceleration of the wheel, and the input of the comparator is connected to the output of the integrator, the output of the comparator is connected with one of the integrator’s information inputs, with one of the inputs of the brake signal cancellation unit, the other two inputs of which are connected to the outputs of the first and second comparators, and the output is connected to one of the integrator’s information inputs. 3. The system under item 1, characterized in that. that the identification block of low coupling coefficients includes an integrator connected to the frequency to voltage converter connected to the output of one of the inputs of the controlled divider, and a comparator, the input of which is connected to the output of the controlled divider, and the output is connected to the timer input, and the timer output is connected to the second the input of a controlled divider. 4. Pop system. 1, characterized in that the identification unit of high adhesion coefficients is made in the form of a transistor current source, in which the output current is proportional to the difference between the threshold voltage specified by the voltage divider and the voltage proportional to the current values of the wheel acceleration signal. 5. The system pop. 1, characterized in that the pulse control signal correction unit includes a timer connected by one input to the output of the main control signal generating unit, and by another input to the output of the pulse control signal generating unit, connected by the output to one of the inputs of the voltage divider, the second input which is connected to the output of the low clutch identification unit. Un urn -CD 28 a FIG. 4 FIG. 9 FIG. 10 * 20 * -—> P" Uonop. .113 * —HZZh— from 18 BUT --------TO}--................ from / 7 in FIG. eleven 112 FIG. 12 FIG. To. FIG. 21