Control method for antilock braking systems with stress sensor
AssigneeJapan Electronics Industry, Limited
InventorNagao Miyazaki
Life of this patent
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Abstract
An antilock braking system using stress sensors installed in the wheel axle of a motor vehicle. The stress sensors measure a road surface frictional force, a vertical load, a road surface friction coefficient, a braking torque, and a side force. An arithmetic calculator calculates a parameter value M from these measured values. An ABS controller controls movement process toward a braking pressure reduction mode in accordance with the change in the value M. Thereby, the system can preclude the locking of the wheel of the motor vehicle even when the brake is suddenly applied.
Claims10
A control method for controlling the release timing of the brake pressure in antilock braking systems for motor vehicles by processing a measured value of at least one stress sensor in an arithmetic means, said method comprising the steps of:
- sampling a measured value Fs of road surface frictional force between a road surface and a wheel of the motor vehicle, a measured value Ts of braking torque applied on the wheel from the stress sensor respectively;
- calculating a parameter M=Fs-Ts from said sampled value;
- and
- monitoring a calculated value of said parameter M from the time when a braking pressure is applied on the wheels to release the braking pressure when the calculated value of said parameter M reaches a prepared threshold TH.
A control method for antilock braking systems for controlling the release timing of the brake pressure for motor vehicles by processing a measured value of at least one stress sensor in an arithmetic means, said method comprising the steps of:
- sampling a measured value Ts of braking torque applied on the wheels, a measured value Ns of a vertical load of the motor vehicle, and a measured value .mu.s of a road surface friction coefficient between a road surface and the wheel of the motor vehicle from the stress sensor respectively;
- calculating a parameter M=Nsx.mu.S-Ts from said sampled values;
- and
- monitoring a calculated value of said parameter M from the time when a braking pressure is applied on the wheels to release the braking pressure when the calculated value of the parameter M reaches a prepared threshold TH.
A control method for antilock braking systems for controlling the release timing of the brake pressure for motor vehicles by processing a measured value of at least one stress sensor in an arithmetic means, said method comprising the steps of:
- sampling a measured value Fs of road surface frictional force between a road surface and a wheel of the motor vehicle by using the stress sensor;
- calculating a differential coefficient dFs/dt of a road surface frictional force from said values;
- and
- monitoring said differential coefficient dFs/dt of a road surface frictional force from the time when a braking pressure is applied on the wheels to release the braking pressure when dFs/dt becomes zero.
A control method for antilock braking systems for controlling release timing of brake pressure of motor vehicles by processing a measured value of at least one stress sensor in an arithmetic means, said method comprising the steps of:
- sampling a measured value .mu.s of a road surface friction coefficient between a road surface and a wheel of the motor vehicle by using the stress sensor;
- calculating a differential coefficient d.mu.s/dt of a road surface friction coefficient from said values;
- and
- monitoring said differential coefficient d.mu.s/dt of a road surface frictional coefficient from the time when a braking pressure is applied on the wheels to release the braking pressure when d.mu.s/dt becomes zero.
A control method for antilock braking systems for controlling release timing of brake pressure of motor vehicles by processing a measured value of at least one stress sensor in an arithmetic means, said method comprising the steps of:
- sampling a measured value Ss of side force and a measured value .mu.s of a road surface friction coefficient between a road surface and a wheels of the motor vehicle using the stress sensor;
- specifying a threshold value TH corresponding to the measured value .mu.s of road surface friction coefficient sampled from the stress sensor from a plural threshold data prepared in advance according to the measured value .mu.s;
- and
- comparing said measured value Ss and said specified threshold value TH every time said measured value Ss is sampled from the stress sensor, to release the braking pressure when said measured value Ss reaches said threshold value TH in the comparing step.
Dependencies are inferred from the claim text.