Antilocking control system
First Claim
1. In an antilocking control system for the wheel brakes of a vehicle including a pressure regulating unit for commonly regulating the pressure in the brakes of at least two wheels of the vehicle, sensor means for producing output signals corresponding to the rotational behavior of the wheels whose brakes are being regulated, and evaluation and control circuit means responsive to the output signals from said sensor means for producing control signals for said pressure regulating means to cause same to regulate the pressure, said control signals being selectively based either on the rotational behavior of the wheel first tending to lock (select-low) or on the rotational behavior of the wheel which is the last to show a tendency to lock (select-high), the improvement wherein said evaluation and control circuit means includes:
- first means effective during the select-low mode of operation for measuring the time duration (T1) of the pressure buildup phase following a pressure reduction phase until there again occurs a tendency to lock at at least one wheel;
switching means responsive to the occurrence of a signal indicating a tendency to lock for switching the mode of operation to select-high;
second means for measuring the time duration (T2) of the pressure increase period during said select-high mode of operation and for continuously comparing the result with the measured time duration (T1) of the pressure buildup phase during select-low operation;
control means responsive to the measured time duration T2 having reached a given relationship to the previously measured time duration T1 for effecting continuation of the select-high mode of operation for a given time duration T3 and then switching the mode of operation back to the select-low mode of operation; and
switch-back means responsive to an indication, during select-high operation, that the second wheel also shows a tendency to lock before a given time duration T2 has been reached for effecting a switch-back to the select-low mode of operation.
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Accused Products
Abstract
An antilocking control system for vehicles in which control signals for controlling a pressure regulating unit associated with two wheels or two groups of wheels are produced in an evaluating circuit from the signals of at least one sensor associated with these wheels or groups of wheels and in which the pressure is at times controlled based on the rotational behavior of the wheel first tending to lock (select-low) and at times based on the rotational behavior of the wheel being the last to show a tendency to lock (select-high). During the select-low mode of operation the duration T1 of the pressure buildup phase following a pressure reduction phase is measured until there again occurs a tendency to lock at at least one wheel and then the mode of operation is switched to the select-high mode. During the select-high mode of operation the duration T2 of the pressure increase period is measured and the result is continuously compared with the measured duration (T1) of the pressure buildup phase during select-low operation. When the measured duration T2 reaches a given relationship to the duration T1, the select-high mode of operation is continued for a given duration T3 after which the mode of operation is switched back to the select-low mode. A switching arrangement is provided which responds if, during the select-high mode of operation, the second wheel (or group of wheels) also shows a tendency to lock before a given time duration T2 has been reached, to effect switching back to the select-low mode of operation.
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Citations
28 Claims
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1. In an antilocking control system for the wheel brakes of a vehicle including a pressure regulating unit for commonly regulating the pressure in the brakes of at least two wheels of the vehicle, sensor means for producing output signals corresponding to the rotational behavior of the wheels whose brakes are being regulated, and evaluation and control circuit means responsive to the output signals from said sensor means for producing control signals for said pressure regulating means to cause same to regulate the pressure, said control signals being selectively based either on the rotational behavior of the wheel first tending to lock (select-low) or on the rotational behavior of the wheel which is the last to show a tendency to lock (select-high), the improvement wherein said evaluation and control circuit means includes:
- first means effective during the select-low mode of operation for measuring the time duration (T1) of the pressure buildup phase following a pressure reduction phase until there again occurs a tendency to lock at at least one wheel;
switching means responsive to the occurrence of a signal indicating a tendency to lock for switching the mode of operation to select-high;
second means for measuring the time duration (T2) of the pressure increase period during said select-high mode of operation and for continuously comparing the result with the measured time duration (T1) of the pressure buildup phase during select-low operation;
control means responsive to the measured time duration T2 having reached a given relationship to the previously measured time duration T1 for effecting continuation of the select-high mode of operation for a given time duration T3 and then switching the mode of operation back to the select-low mode of operation; and
switch-back means responsive to an indication, during select-high operation, that the second wheel also shows a tendency to lock before a given time duration T2 has been reached for effecting a switch-back to the select-low mode of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
- first means effective during the select-low mode of operation for measuring the time duration (T1) of the pressure buildup phase following a pressure reduction phase until there again occurs a tendency to lock at at least one wheel;
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28. In an antilocking control system for the wheel brakes of a vehicle including a pressure regulating unit for commonly regulating the pressure in the brakes of two wheels of the vehicle, a sensor associated with each of the regulated wheels for producing output signals corresponding to the rotational behavior of the wheels, and evaluation and control circuit means responsive to the output signals from said sensors for producing control signals for said pressure regulating means, to cause same to regulate the pressure, said control signals being selectively based either on the rotational behavior of the wheel first tending to lock (select-low) or on the rotational behavior of the wheel which is the last to show a tendency to lock (select-high);
- the improvement wherein said evaluation and control circuit means includes;
first means effective during the select-low mode of operation for measuring the vehicle deceleration V*F1 during the pressure buildup period following a pressure reduction period;
a switching means, responsive to the occurrence of a signal indicating a tendency to lock following pressure buildup, for switching the mode of operation to the select-high mode;
second means for measuring the vehicle deceleration V*F2 during this select-high mode of operation;
control means responsive to the vehicle deceleration V*F2 having reached a given relationship to the vehicle deceleration V*F1 for effecting continuation of the select-high mode of operation for a given period of time and then for switching the mode of operation back to the select-low mode of operation; and
switch-back means, responsive to an indication during select-high operation that the second wheel also shows a tendency to lock before the given relationship V*F2 to V*F1 has been reached, for immediately switching the mode of operation back to the select-low mode.
- the improvement wherein said evaluation and control circuit means includes;
Specification