Claims
- 1. A system for detecting wheel sensor malfunctions for an automotive vehicle having a plurality of wheels each having a rotational behavior and having a brake system with a control unit including at least one anti-lock control and traction slip control, said system for detecting wheel sensor malfunctions comprising:
- sensor means for sensing the rotational behavior of said plurality of wheels and generating output signals representative of the rotational behavior;
- first circuit means, responsive to said output signals, for generating:
- (a) wheel speed signals individually representative of the wheel speeds of said plurality of wheels and
- (b) wheel acceleration signals individually representative of the wheel accelerations of said plurality of wheels;
- logic circuit means, responsive to:
- (a) said wheel speed signals and
- (b) said wheel acceleration signals,
- for generating valve control signals;
- a valve block responsive to said valve control signals for modulating braking pressure; and
- second circuit means, responsive to:
- (a) said wheel speed signals,
- said wheel acceleration signals,
- (c) a predetermined deceleration limit value,
- (d) a predetermined overspeed threshold, and
- (e) a predetermined bottom speed threshold
- for initiating a time monitoring function having a duration when:
- (a) at least one of said wheel acceleration signals has a wheel acceleration value which is below said deceleration limit value and said overspeed threshold, and
- (b) at least one of said wheel speed signals has a value which is below said bottom speed threshold.
- 2. A system in accordance with claim 1, wherein said duration is in the range between 20 and 60 seconds.
- 3. A system in accordance with claim 2, wherein said duration is approximately 30 seconds.
Priority Claims (1)
Number |
Date |
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41 22 484.1 |
Jul 1991 |
DEX |
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Parent Case Info
This application is a division of application Ser. No. 08/178,300, filed as PCT/EP92/01392 Jun. 20, 1992, now U.S. Pat. No. 5,476,311.
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Divisions (1)
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178300 |
Jan 1994 |
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