Back to results
US 4,309,060 AGranted
Anti-locking wheel control system
AssigneeRobert Bosch GmbH
InventorsHeinz Leiber, Volker Braschel, Wolf-Dieter Jonner, Hans-Herbert Wupper
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeRobert Bosch GmbH
InventorsHeinz Leiber, Volker Braschel, Wolf-Dieter Jonner, Hans-Herbert Wupper
Estimating the term…
The invention relates to an anti-locking wheel control system in which control signals for the variation of the brake pressure are derived from the rotary motion behavior of the vehicle wheels and in which a test circuit is provided, which initiates a test for at least one wheel brake when a signal appears which indicates a tendency toward locking, in which test the over-braked vehicle wheel enters a state of high slippage, whereby the test circuit determines how the wheel behaves at the given coefficient of friction between the road surfaces and the tire, and whereby on the basis of this determination, the test circuit either provides a state in which the brake pressure is regulated or else switches to a state in which the control is made ineffective for at least some of the wheel brakes.
An anti-locking wheel control system in which control signals for the variation of the brake pressure are derived from the rotary motion behavior of the vehicle wheels and in which a test circuit is provided, which initiates a test for at least one wheel brake when a signal appears which indicates a tendency toward locking, in which test the over-braked vehicle wheel enters a state of high slippage, whereby the test circuit determines how the wheel behaves at a given coefficient of friction between road surface and tire, and whereby on the basis of this determination, the test circuit either permits the state in which the brake pressure is regulated or else switches on the state in which the control system is made ineffective for at least some of the wheel brakes, characterized by means incorporated in said test circuit for maintaining the brake pressure substantially constant during the test and by means for determining by monitoring at least one wheel during the deceleration phase, whether the vehicle wheel is running on a base with a coefficient of friction .mu., where the .mu.-slippage curve rises with increasing slippage above a predetermined slippage value whereby the control system is made ineffective if such a coefficient of friction is determined.
An anti-locking wheel control system in which control signals for the variation of the brake pressure are derived from the rotary motion behavior of the vehicle wheels and in which a test circuit is provided which initiates a test for at least one wheel brake when a signal appears which indicates a tendency toward locking, in which test the over-braked vehicle wheel enters a state of high slippage, whereby the test circuit determines how the wheel behaves at a given coefficient of friction between road surface and tire, and whereby on the basis of this determination the test circuit either permits the state in which the brake pressure is regulated or else switches on the state in which the control is made ineffective for at least some of the wheel brakes, characterized by means incorporated in said test circuit for maintaining the the brake pressure substantially constant during the test and means in said test circuit for making the control system ineffective, if a signal indicating a reduction of slippage appears after the wheel velocity has dropped below a low velocity v.sub.min.
Dependencies are inferred from the claim text.