Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
  • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
  • B60T8/88—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means
  • B60T8/885—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration with failure responsive means, i.e. means for detecting and indicating faulty operation of the speed responsive control means using electrical circuitry
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T2270/00—Further aspects of brake control systems not otherwise provided for
  • B60T2270/40—Failsafe aspects of brake control systems
  • B60T2270/406—Test-mode; Self-diagnosis
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
  • B60T2270/00—Further aspects of brake control systems not otherwise provided for
  • B60T2270/40—Failsafe aspects of brake control systems
  • B60T2270/413—Plausibility monitoring, cross check, redundancy
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S303/00—Fluid-pressure and analogous brake systems
  • Y10S303/09—Plural processors

Definitions

• the invention relates to an anti-lock control system for the separate monitoring of the wheels of a vehicle, consisting of four identically constructed control channels consisting of sensors, evaluation circuit and brake control unit for the various wheel brakes as well as safety circuits and devices for checking the functionality of the anti-lock control system in time Intervals in a test cycle in that an identical test signal is coupled into all channels from the test device and that the effects of these test signals at predetermined, corresponding points on the channels from the safety circuit and the test device, in pairs with regard to an at least approximate correspondence of the time occurrence and / or the value of the occurring signal can be compared, a switching and / or warning signal being generated when the compared signals are around a predetermined value, which can also be 0. differ from each other.
• DE-OS 26 14 016 describes a two-channel anti-lock regulator in which a test signal is coupled into the channels from time to time, in particular when the vehicle is at a standstill, and in which the resulting signals are compared at different, corresponding positions of the channels become. If the signals do not match, a warning and / or switching signal is generated.
• a safety circuit for both channels that contains time elements, which can be checked separately, for which purpose the time constants of the time elements can be shortened if necessary.
• a two-channel anti-lock controller to dispense with a safety circuit with timing elements, to couple a test signal into the channels at predetermined time intervals even while driving, to provide two test circuits and in each of them the at different positions to compare the resulting signals of the two channels, the warning and / or switching signal being generated if they do not match.
• a rehab is recognized even if a test circuit fails.
• the object of the invention is to assign a safety and testing device to an anti-blocking regulator with four control channels, which allows redundant monitoring of the system, in which test signals do not have to be coupled in while driving, and which requires relatively little effort.
• the safety circuit with timing elements is retained and the principle described in DE-OS 26 14 016 is advantageously transferred to a four-channel controller. Despite the four channels, only two safety circuits are required and these monitor the channels redundantly. According to a development of the invention, the same monitoring circuit that compares the controller signals is also used to compare the signals generated in the safety circuit in the test cycle. For this purpose, the time constants of the safety circuit are preferably shortened so that the test cycle does not have to be extended too long.
• the monitoring circuit is particularly simple if, in the case of a digital design of the control channels, the digital signals to be transmitted from one channel pair to the safety circuit of the other channel pair are first converted into serial signals in the transmission paths and then converted back into parallel signals. Then you only need to compare the individual signal parts of the serial signals for agreement with the monitoring circuit. This also applies to the comparison of the safety circuit signals when checking the safety circuit.
• Fig. 2 the monitoring circuit used in this.
• the anti-lock controller shown in Fig. 1 consists of four sensors S 1 - S 4 , which provide the wheel speed corresponding signals.
• the signals from the transmitters S 1 and S 2 are fed via a two-channel amplifier unit 5 to a block 6 which has a two-channel controller 7, a safety circuit 8, a data converter 9, a second data converter 10 and connecting channels 11-13.
• Parts 7-13 work digitally, ie digital words are transmitted in parallel via the connecting channels 11-13.
• These digital words also contain the valve control signals that pass through the safety circuit and can be blocked there in the event of a fault.
• These valve control signals activate the brake pressure control device via amplifiers 16 and 17, which is shown here for convenience as valve 1 4 and 15 per channel.
• the controllers 7 and 7 ' generate digital signals, which are represented as digital words in parallel via the line system 11 or 11' to the safety circuit between 8 ' reach.
• the safety circuits 8 and 8 ' which have time elements, monitor these control signals, but possibly via the line systems 11 and 11' also generated at different positions, signals generated in the controllers 7 and 7 'for too long a duration and possibly other impossibilities . If such conditions occur, the safety circuits emit a warning and / or shutdown signal via line 18 or 18 '. What can be monitored in a system with side members can be found, for example, in DE-OS 22 32 034.
• Both safety circuits 8 and 8 'thus monitor the signals of both controllers, so that an impossibility (error) that occurs is recognized even if a safety circuit fails.
• the safety circuits 8 and 8 ' also contain the test devices which check the system from time to time when the vehicle is stopped.
• the sensors S 1 - S 4 are switched off via lines 19 and 19 'and an identical test signal is coupled into all channels via lines 20 and 20', which is constructed in such a way that all branches of the controller can be checked.
• the signals which arise at the different, corresponding points of each channel pair are compared (in accordance with DE-OS 26 14 016) in succession by the action of the test device (in FIGS. 8 and 8 ').
• FIG. 2 A configuration of the monitoring circuit 23 that is possible and sufficient for the exemplary embodiment in FIG. 1 is shown in FIG. 2.
• the lines 21 and 22 of FIG. 1 are connected to the terminals 21 'and 22'.
• the exclusive iv-OR gate 24 has an output signal if the signals present at the same time do not match, which means that an error must be present.
• the gate 27 is prepared for the transducers (lines 19, 19 ”) by the switch-off signal fed to the terminal 26.
• the branches of the safety circuits equipped with timing elements can also be checked by making these branches - after switching the timing elements - respond and then again comparing signals generated by corresponding positions. This takes place here in a subsequent control cycle in which the AND gate 29 is prepared by the block 25 and, if the signals fed in at 21 'and 22' differ, the error signal at terminal 31 is generated via these AND gates 29. If necessary, other system signals can then be checked. Since the two safety circuits also receive identical input signals from the controller during the test cycle, any nodes in the safety circuit can be continuously monitored for identity.

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• Engineering & Computer Science (AREA)
• Transportation (AREA)
• Mechanical Engineering (AREA)
• Regulating Braking Force (AREA)
• Valves And Accessory Devices For Braking Systems (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6135941

Family Applications (1)

Country Status (6)

Cited By (5)

Families Citing this family (23)

Citations (4)

Family Cites Families (3)

• 1981
  • 1981-07-02 DE DE19813126102 patent/DE3126102A1/de not_active Withdrawn
• 1982
  • 1982-06-22 WO PCT/DE1982/000131 patent/WO1983000124A1/en active IP Right Grant
  • 1982-06-22 DE DE8282902059T patent/DE3273323D1/de not_active Expired
  • 1982-06-22 US US06/474,574 patent/US4493210A/en not_active Expired - Fee Related
  • 1982-06-22 JP JP57502147A patent/JPS58501027A/ja active Granted
  • 1982-06-22 EP EP82902059A patent/EP0082859B1/de not_active Expired
  • 1982-06-30 IT IT22155/82A patent/IT1152272B/it active

Patent Citations (4)

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