FR2461622A1 - ASSEMBLY FOR CONTROLLING THE REGULATOR OF A VEHICLE BRAKE EQUIPMENT WITH ANTI-LOCK, EQUIPPED WITH AT LEAST ONE CONTROL MICROCOMPUTER FOR THE CONTROL CHANNELS - Google Patents

Abstract

CONTROL ASSEMBLY FOR THE MONITORING OF THE REGULATOR OF A VEHICLE BRAKING EQUIPMENT WITH ANTI-LOCK, REALIZED WITH MICRO-COMPUTERS. AN ADDITIONAL COMPUTER 18 AT LEAST IS PROVIDED FOR THE CONTROL AND MONITORING OF THE REGULATION CHANNELS AND FURTHER INCLUDES A DEVICE FOR DELIVERY OF CONTROL SIGNALS AND THEIR INJECTION IN THE INPUT CIRCUITS 6, 8, AS WELL AS A SELF-TEST DEVICE AND OUTPUTS 46, 48 CONNECTED TO AN ALARM DEVICE AND TO RELAYS OF ELECTROMAGNETIC DISTRIBUTORS. IT ALSO INCLUDES A CONTROL UNIT FOR THE SEQUENCE AND INTERRUPTION OF THE CONTROL OF THE REGULATION SIGNALS IN THE EVENT OF BRAKING, OF THE REGULATION SIGNALS PRODUCED BY THE CONTROL SIGNALS AND THE ACTIVATION OF THE SELF-TEST DEVICE, IN FUNCTION OF A PREDETERMINED PRIORITY SEQUENCE.

Description

246 1622

  The present invention relates to a control assembly of the regula-

  an anti-lock vehicle braking equipment, equipped with at least one control microcomputer for the control channels for the translation of speed-dependent measuring signals, delivered by the rotation sensors and transmitted to a input circuit, and for the output of control signals that

  amplifiers transmit to electromagnetic distributors

  for the controlled application of brake pressure to cylinders

brakes.

  The invention starts from a vehicle braking equipment with anti-lock, realized with an input circuit and a microcomputer by regulation channel. An essential part of the translation taking place in the microcomputer using signals delivered by a rotation sensor, the monitoring of erroneous functions

  is no longer possible by the safety and control

  previously used in the case of a realization in cabled logic.

  The invention therefore relates to a control assembly for monitoring the regulator of a vehicle braking equipment

  with anti-lock, made using microcomputers.

  The following conditions must be met.

  1) The control circuit must not be arranged spatially

  in the control channel that it monitors.

  2) The complete signal path (source-destination) must be monitored.

  3) The control of vehicle braking equipment with anti

  blocking must be possible both in the active state and in the passive state.

  4) The control fixture should monitor itself.

  ) The detection of errors shall be transmitted to a

  signaling, without particular selection of errors.

  According to an essential characteristic of the invention, the assembly comprises at least one additional microcomputer for the control and monitoring of the control channels, whose outputs of

  data are partially linked by lines to the data sources

  born of microcontrollers for signal control

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  and by lines, at the outputs of the amplifiers of the electromagnetic distributors, and a device for the delivery of control signals and their injection into the circuits

  input, a self-test device and outputs connected to a

  positive alarm and electromagnetic valve relays; and a control unit of the control interrupt sequence

  control signals in case of braking, control signals

  produced by the control signals, and the activation of the

  self-test device, according to a priority sequence preced-

determined.

  Other features and advantages of the invention will be

  better understood using the detailed description below and

  attached drawings in which: Figure 1 shows the block diagram of the control assembly; and FIG. 2 represents the flowchart of the work steps executed in

- the microcomputer

  Figure 1 shows the following modules of two control channels 2 and 4: input circuits 6 and 8, computers 10 and 12 control ABV (anti-lock device) and / or ABV and ALB (load-dependent braking control) ), electromagnetic valve amplifiers 14 and 16. A microcomputer 18 is provided for the

  control of the two control channels.

  The microcomputer 18 is connected to the control computers by groups 20, 22 of data lines. These groups of lines

  transmit for control the signals of the microcomputers

  10, 12 to the microcomputer 18.

  Two lines 24 and 26 connect the microcomputer 18 to the input circuits 6 and 8. The microcomputer 18 delivers on these lines control signals, which activate a divider (not shown) in

  the input circuits 6, 8 to divide or halve the word

  existing speed data to simulate a set braking.

  Lines 28, 30 further connect the outputs of the amplifiers

  14 and 16 of electromagnetic valves on the microcomputer 18.

  An output line 32 of the microcomputer 18, on which signals are delivered after the execution of a self-test program,

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  is connected to the reset input of flip-flops 34, 36, whose states of the output signals are interrogated by the control microcomputers 10, 12 using lines 38, 40 and which can be set to The microcomputer 18 further comprises two outputs 46 and 48 delivering alarm and blocking signals to the electromagnetic distributors. The operation of the control circuit is described below in

using Figure 2.

  Three control operations are planned for the microcomputer 1) control of the regulation signals produced by braking set in the anti-lock braking equipment, 2) control of the regulation signals produced in anti-lock braking equipment by means of control signals, generated and transmitted separately,

  3) Self-monitoring of the microcomputer.

  The three control operations referred to above take place automatically

  with the priorities indicated by numbers 1, 2 and 3.

  1) Control of regulation signals produced by braking (control of anti-lock braking equipment in the state

  active). Each regulation signal having a temporal limitation

  this criterion is used to control the

  regulation erroneous products in the brake equipment with anti-

  blocking. These control signals thus monitored include the control signals of the electromagnets, the differentiator signals, that is to say the deceleration, acceleration control signals.

  and slip, as well as the signals indicating the operation of

lation.

  For controlling the control signals of the electromagnets, the microcomputer comprises a register, containing an assigned data word

  at the limit time. As soon as the electronic control signal appears

  magnet, and as long as this signal is present, the register is decremented to zero maximum. The decrease of the contents of the register is

2 46 162 2

  stopped by the suppression of the control signals of the electromagnets.

  The cancellation of the contents of the register shows at the output 46 of the microcomputer 18 an error signal activating an error display. The same type of control is also performed for

  deceleration and acceleration regulation. The critical time of

  of these signals being lower than that of the control signals

  electromagnets, the control of deceleration regulation signals

  ration and acceleration can detect an error in anti-lock braking equipment earlier than signal monitoring

control of the electromagnets.

  For the monitoring of slip control signals, the reference speed of both control channels is monitored

  as follows: the logical states of the control signals of the

  are interrogated and checked to see if microcomputers

  regulators can correctly calculate the reference speed.

  This is to prohibit a reference speed, passed abruptly or remaining at a high value, to produce a failure in the

two channels.

  The slip control signals are controlled as follows. When the positive edges of the slip control signals in the two channels coincide or when these signals are present simultaneously in the two channels for a predetermined time, the control microcomputers 10 and 12 are instructed to select the minimum reference, because this state indicates an error or a synchronous rotation of the wheels. In order to specify, the microcontroller having the higher reference speed decreases it rapidly. An intersection of the two reference velocity curves, as a result of the faster decay of the higher reference velocity, makes it possible to conclude that the control microcomputer can calculate the reference velocity whose value was thus correct. In this case, the error criterion

  was simply attributable to synchronous operation of the wheels.

  This is why the maximum of the reference speed can again

to be selected.

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  When a control microcomputer has an error, the instruction "rapid decay of the reference" does not result in an intersection of the reference speeds. The minimum instruction then remains, that is, the properly functioning control microcomputer can continue to adjust with its own reference. When the instruction "fast decay of the higher reference speed" does not result in an intersection of the velocities

  within a predetermined time, this situation is

  pretended as an error and an error signal is issued on the

exit 46.

  This type of monitoring of slip control signals is essentially intended to prohibit the absence of pressure in two

  wheels due to an erroneous value of the reference speed.

  The realization of the circuits and computers for monitoring the aforementioned signals is not described here, since it is not the object

of this patent.

  Control of the regulation signals produced by braking

  set in microcomputer 18 with the highest priority

  male. In other words, the check is made as soon as it appears

  a regulation signal in the case of a set braking. The con-

  control is also performed when an inadmissible interference signal

simulates the case of braking set.

  2) Control of control signals produced by control signals (control of anti-lock braking equipment

in the passive state).

  The control according to 1) essentially detects the too long application of a signal. However, it does not make it possible to detect whether a regulation signal can be delivered. The check described below

is provided for this purpose.

  During normal operation, in the absence of any braking

  and when the vehicle speed is greater than 16 km / h, the micro-

  computer 18 delivers lines 24 and 26, to a binary divider (not shown) in the input circuits 6 and 8, an instruction

  which produces the reduction or division by 2 of the instantaneous speed-word

  tani. This simulated deceleration gives rise to

  deceleration and slip. As soon as these regulatory signals

  tion act on the electromagnetic

  braking pressure, the control signals of the electro-

  magnets are blocked instantly, in order not to deliver too much energy to the electromagnets, to spare the final amplifiers connected upstream of the electromagnetic distributors and not to control the relays of the distributors. After the accused

  receiving the control signals from the electromagnetic distributors

  The regulation signals produced by the control signals are controlled according to the method previously described under 1). Activation of the dividers provided in the input circuits is

  then interrupted. Deactivation of the dividers produces the

  an acceleration control signal, controlled and

  acknowledged by the microcomputer 18. The control cycle is con-

  stunned as positive and terminated if all the regulation signals are

  correctly appeared. Otherwise, an error signaling

  reur is performed on the outputs 46 and 48 of the microcomputer 18.

  It is known that any program requires a certain time in the microcomputers 10, 12 and 18. When a deceleration regulation signal for example is determined during the execution of this control, a logic combination program converts it into a control signal. , then apply it to the regulating electromagnetic distributor. Much time elapses if all the regulation signals of the microcomputer 18 are interrogated successively, the divider of the input circuits 6 and 8 is then disconnected and

  the decay of the distributor control signal is expected.

  Relays can absorb too much energy, or even

  electromagnetic regulating distributors.

  In order to avoid this disadvantage, all the electromagnetic valve control signals are brought together by a program

  interruption. The latter drives the microcomputer 18 to

  roger the control lines of the electromagnetic distributor and to deliver an interruption to the control microcomputers 10 and

  12, thus producing a cut-off of the control signals of the electro-

2 4 6 1 6 2 2

  magnets. This arrangement requires a much shorter time and avoids the risk of excessive control of the distributors

  electromagnetic regulation.

  This check is carried out with the priority immediately below

pool.

  3) Self-control of the microcomputer 18.

  The microcomputer has a large time constant generator, which calls a program performing operations whose

  controls the main functional modules of the micro-

  computer 18. At the end of the self-check, a correct result

  reset the two flip-flops 34 and 36. The control microcomputers

  10 and 12 correspondents interrogate the state of the output signals of these latches via lines 38 and 40, then reset these latches to 0 by lines 42 and 44. When the self-check detects an error, so that one of the latches is not reset to 0, a separate error signaling (not shown) is performed and the electromagnetic distributor of the regulations 14

is cut.

  This self-check is performed with the minimum priority.

  The flowchart in Figure 2 represents the sequence of the various

no control.

  Of course, various modifications may be made by those skilled in the art to the principle and to the devices which have just been described solely by way of nonlimiting examples, without

depart from the scope of the invention.

Claims (8)

claims   1. Regulator control assembly of anti-lock vehicle braking equipment, equipped with at least one control microcomputer for control channels for translating speed-dependent measurement signals delivered by sensors of rotation and transmitted to an input circuit, and for the outputting of control signals, which amplifiers transmit to electromagnetic distributors for the controlled application of the brake pressure to the brake cylinders, said arrangement being characterized by at least one an additional microcomputer (18) for controlling and monitoring the control channels, whose data outputs are partially connected by lines (20, 22) to the data outputs of the control microcomputers (10, 12) for control of the regulation signals and, by means of   (28, 30) at the outputs of the electronic valve amplifiers   magnets (14, 16), the microcomputer (18) further comprising a device for the delivery of control signals and their injection into the input circuits (6, 8), as well as an automatic control device. test and outputs (46, 48) connected to an alarm device and solenoid valve relays, and by a control unit of the sequence and interruption of control of the control signals in the event of braking, signals of regulation   produced by the control signals and the activation of the   self-test, according to a predetermined priority sequence   undermined. Control arrangement according to claim 1, characterized in that the microcomputer (18) monitors the application times of the control signals and generates an error alarm signal during   exceeding specified time thresholds.   3. Control assembly according to one of claims 1 and 2, characterized   characterized in that the microcomputer (18) comprises registers decrementable by the clock synchronization signals and whose information contents are assigned to the limit times, the   reset inputs to the clocks being connected to the communication line   electromagnetic distributors and at the outputs of the modules of the control microcomputers (10, 12) delivering the signals. 2 4 6 1 6 2 2 regulation.   4. Control assembly according to claim 1, characterized in that   that the microcomputer (18) comprises, for the control of micro-   control computers (10, 12), a control device which is connected to dividers housed in the input circuits (6, 8) connected to the data input of the control microcomputers   (10, 12) and dividing the instantaneous speed data word to a word   test data, and which cyclically delivers control signals for the activation of these divisors.   5. Control assembly according to any one of the claims   1 to 4, characterized in that the microcomputer (18) comprises a test circuit with a large time constant generator, which cyclically sets the contents of an ordinal counter   the execution of a program for testing the various functional modules of the microcomputer (18).   Control assembly according to claim 5, characterized in that the ordinal counter, at the end of the test program, delivers a "test-end" signal which is applied to the reset inputs of assigned latches (34, 36). to the control microcomputers (10, 12) and whose outputs are connected to the circuits housed in the control microcomputers (10, 12) for determining the state of the output signal of the flip-flop, the outputs of the circuits being   linked to the reset inputs of the corresponding flip-flops.   Control arrangement according to Claim 1, characterized in that the control of the control signals in the event of braking has the highest priority, the control of the control signals produced by   control signals the next lower priority and the self- test the minimum priority.   8. Control assembly according to any one of claims 1 to   7, characterized by a control microcomputer by group of two control channels.