CS202726B1 - Connection of the metering and control facility for the cylinder testing shops of the automobile brakes - Google Patents

Abstract

The test stand is a roller braking unit. The device consists of electronic sensors for wheel braking torques, and of an electronic sensor for the operating pressure, connected to an evaluating circuit consisting of measurement and store circuits, and of an evaluation unit. The store control input is connected to a wheel slip indicator. A slip rate selector for the wheels can be provided between the store and indicator circuits. The selector can have hand-operated keys.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention

Dooavatoí devices mainly use hydraulic or pneumatic system for transmission of examined quantities of braking systems for signal acquisition, signal processing and reading on the measuring instrument and registration record. The disadvantage of these devices is unreliable reading of measured values on the measuring instrument · Their recording device allows only recording the relationship of two quantities, usually braking and control forces · Furthermore, it is not possible to read the braking forces at the moment of wheel lock, in these chosen conditions. A special device must be used to measure the rise and fall of the pressure in air pressure braking systems, without the use of uniform pressure sensors.

The above mentioned drawbacks are removed by involving a measuring and control device, for the cylindrical test ^b y ^d car ^p ccording-finding, - ^h is O ^Z poddtate comprises tem ^that к cylinders service brakes are connected via levers connected to electronic sensors brake momennu wheels which are together with the second valves of the control pressure sensor in the brake system, each connected to a grinding circuit, which is connected via a memory circuit to an evaluation device, wherein the control inputs of the memory circuits are via controllers -and one of the selector contacts

202 726

202 726 manual input buttons connected to the wheel slip indication Siens, wherein the outputs of the wheel slip preselection actuators are additionally connected to a sum circuit whose output is coupled via further selector contacts and control input of a second memory circuit of the second electronic brake pressure control sensor and control an input of a third memory circuit connected between the third measuring device and a third measuring circuit connected to a third electronic pedal pressure sensor, the second memory circuit being connected to the second outputs of the memory block of the automatic device for evaluating the pressure build-ups and drops in the brake systems; the input of the second measuring circuit is connected to the input of the discriminator.

The electronic conception of the device forms an integrated workplace for simultaneous measurement, recording and evaluation of decisive variables of car braking systems, based on the method of sensing and processing of measured variables using memories acting automatically at the moment of blocking or reaching the selected value of wheel slip. investigated variables. The values of the characteristic quantities are registered in the form of memory preservation of the analogue quantity or graphical record on the recorder.

The electronic system of the device allows a comprehensive examination of brake systems, especially air systems. Functionally it combines two measuring devices with one sensor connection, a device for examining the braking forces on car wheels depending on system pressure, control force and wheel slip and a device for examining pressure changes in the control system depending on the time.

An exemplary embodiment of the circuit according to the invention is shown in the attached drawing.

The left wheel 1 and the right wheel 6 of the car and the brake system 11 are located on the rollers 6 of the brake test station. The cylinders 6 are provided with electric motors 6, wherein the reaction torque induced by braking to the car 12 is transmitted to the electronic sensors 22 by means of the cylinders 6 and the levers 6, 6 '. 7 *** are located in the braking system J and on the brake pedal 8, where a start and end sensor 6 of the braking process is also connected, connected to two timing circuits Jg, which are further connected and an evaluation logic circuit J1. The electronic sensors 2 ', 7 ' are connected by 9 measuring circuits 11, 11 (and memory circuits 11, 11 ') which are coupled to the wheel slip indicators 12, 12 * and the evaluation devices 21, 22 ' The slip preselection actuators 16, 16 * are connected to the slip indicator members 22 ', to which the summation circuit 17 operated by the buttons 18, 19, 20 is connected. 21 »23 * are connected, and electric motors 6,

The measured value recorder 24 is coupled to the inputs of the analog evaluators 22, 13 * and the digital display 25 with the electrical printer 26. The second electronic pressure sensor 7 * of the pressure sensor is connected via the second measuring circuit 10 * to the de-discriminator 27 and the reference member 28.

202 720 Discriminator 22 is connected to a logic circuit 21 connected further to a memory block 32 with a light indication 33 and a reset button 34 »

Signal generated by electromagnetic sensor 2. 7 *. is processed by a measuring circuit 10, 10 'and with ^p amělováho circuit 11, the AUTOMATIC И stored in Ameto ^{ratio P n} and eyes cator ⁿ í member 12. 12' slip wheels 1, 2 and is evaluated at the evaluating unit 12 »13» The sum of the moometers of the left wheel 1 and the right wheel 2 is performed by the summing circuit 14 and stored in the digital converter 16. With the memory circuits 11, 11 it is possible to directly determine the state of the brake system in dependence on the setpoint slip through driver preferences ^KL Uzu 16 16 * ^automatic operation equ ^ judgments circuit 17 ensures ^zac h ° tion of measured values derived from the blocking of one of the 1, 2, or slip setpoints. The measured values are automatically stored in the manual or automatic control memory, which is preselected by the selector button 18. The manual input, controlled by the button 19, can be used to centrally control the measurement process on all measuring channels or separately. The braking system is started by means of the push-buttons 22, 22 'for each electric motor. The electric motors can be stopped either manually by stop pushbutton 22, 23 * or automatically when the preset slip is exceeded. Graphic recording of the measured values is provided by the recorder 24. The apparatus ^of DT ^m doppinib ^p aralelně к vyhotaocovacím totrojům ^ 12> 13 *. di ^gi tal ^m disptojem printer 25 with an electric 26th

The pressure rise rating is derived from the pressure gradient of the second electronic sensor 7 *, which is compared in the discriminator window 27 with prescribed pressure limits adjustable in a programmable manner. the reference member 28. Pressure rise time interval, start the second switch is realized by a programmable timing circuit 22 ^ · DAAS interval pressure drop is controlled by a timing circuit 30. The correlation time interval, and the pressure gradient is evaluated logicým circuit 31. A result of the action of PA ^m ěťovéh btoku ^about 32 ^ tomaticty stored in ^{d s} ruh it aměťov ^{p s} of a circuit 11 * and vytodwcra ^second evaluating unit 13 **. Light indication 33 shows a good-bad condition. It is necessary to reset the results stored in the memory with the reset button M ·

The measuring and control device according to the invention can be pulled out in all cylindrical test stands of vehicle brakes.

Claims (1)

Connecting the measuring and control device for a service brake cylinder automoOilj, tick ^en é ^IIM, from ^{the e} to the rollers (4) of ^the U ^s e ^b ny ^b RZD as ^p res ^then y (6, 6 *) PMPO uM ele ^ rcrnictó sensor (7, 7 *) of the braking torque of the wheels (1, 2), which, together with the second electronicagraph (7 ^{Z /} ) of the brake pressure control pressure (3), are each connected to a metering circuit (10, 202 720 1θ ', 10), which is connected via a memory circuit C11, 11', 11) to an evaluation device (13, 13 ', 13), wherein the control inputs of the memory circuits (11, 11') are via controllers (16, 16 ') ) the wheel slip presets (1, 2) and one of the contacts of the handwheel select button (18) connected to the wheel slip indicator members (12, 12 ') (1, 2), the outputs of the wheel slip presets (16, 16') (1, 2) are additionally connected to the summation circuit (17), the output of which is connected via further contacts of the selection button (18) and the control input of the second memory circuit (11) of the second electronic pressure control sensor (1 ') and a control input of a third memory circuit (11 ') connected between the third measuring device (13') and the third measuring circuit (10 '), which is connected to a third electronic pedal pressure sensor (7'), with the second memory circuit (11) the second memory outputs are connected a block (32) of an automatic device for evaluating the rise and fall of pressure in brake systems, to the input of the discriminator (27) is connected the output of the second measuring circuit (10).