Anti-lock brake controlling apparatus
AssigneeSumitomo Electric Industries, Ltd.
InventorHideaki Fujioka
Life of this patent
Estimating the term…
Abstract
A pedal stroke detector detects the degree of depression of a brake pedal of a master cylinder to determine a road surface friction coefficient. A wheel speed detector monitors the speed of each wheel of a vehicle. A vehicle body speed calculator estimates the vehicle speed from the wheel speed of each wheel and the degree of depression of the brake pedal as detected by the pedal stroke detector. A lock symptom detecting mechanism detects a lock symptom from the estimated vehicle body speed and wheel speed. When a lock symptom is detected, a memory stores the degree of depression. Subsequent movement calculations are based on the larger of the degree of depression for the instant operational cycle and the degree of depression stored in memory.
Claims17
An anti-lock brake controlling apparatus including a master cylinder for feeding an operation fluid to a wheel cylinder side in accordance with a stepping quantity of a brake pedal, and a fluid pressure controlling valve for controlling a fluid pressure of said wheel cylinder, said apparatus further comprising:
- pedal stroke quantity detecting means for detecting said stepping quantity of the brake pedal;
- said pedal stroke quantity detecting means including means for detecting a friction coefficient of a road surface;
- means for providing a signal for controlling said fluid pressure controlling valve responsive to, at least, said friction coefficient of said road surface detected by said pedal stroke quantity detecting means;
- wheel speed detecting means for detecting a speed of each wheel of a vehicle;
- wheel movements calculating means for calculating wheel movements, including at least a wheel speed responsive to said wheel speed detecting means;
- and
- vehicle body speed estimation calculating means for calculating an estimated vehicle body speed in a position of each wheel responsive to said wheel movements calculating means and a stepping quantity of the brake pedal detected by said pedal stroke quantity detecting means.
An anti-lock brake controlling apparatus comprising:
- a fluid pressure control valve comprising a solenoid valve;
- a wheel cylinder having a fluid pressure adjustable by a switching operation of said solenoid valve;
- wheel speed detecting means for detecting a speed of each wheel of a vehicle;
- wheel movements calculating means for calculating a vehicle movement, including at least a wheel speed, responsive to said wheel speed detecting means;
- and
- pressure regulating signal means for setting a pressure regulating signal, for instructing a switching operation with respect to said solenoid valve, said pressure regulating signal means setting said pressure regulating signal to adjust the fluid pressure of said wheel cylinder responsive to said wheel movements calculating means, and a larger of a stepping quantity of a brake pedal detected by a pedal stroke quantity detecting means and a stepping quantity of said brake pedal stored in a memory during a skid cycle.
An anti-lock brake control system for a vehicle, comprising:
- a brake detector for monitoring a degree of depression of a brake pedal;
- a wheel speed detector for monitoring a rotational speed of a wheel;
- means for determining a maximum permissible reduction in said rotational speed of said wheel during an anti-lock brake control operation, based on a larger of said degree of depression of said brake pedal and a previous degree of depression during a skid cycle, stored in a memory;
- and
- means, responsive to said maximum permissible reduction in said rotational speed determined by said determining means, for changing a brake pressure applied to said wheel.
An anti-lock brake control system for a vehicle, comprising:
- a brake detector effective to monitor a degree of depression of a brake pedal;
- at least first and second wheel speed detectors effective to monitor a speed of rotation of at least first and second wheels;
- at least first and second memories corresponding to said at least first and second wheels;
- means for determining a maximum permissible reduction in said speed of rotation of said wheels based on a larger of said degree of depression of said brake pedal for a present operational cycle and a previous degree of depression stored in said at least first and second memories;
- means for detecting a lock symptom in at least one of said at least first and second wheels;
- means, responsive to said means for detecting, for storing said degree of depression of said brake pedal in said at least first and second memories;
- and
- means, responsive to said means for detecting, for changing a brake pressure applied to said wheel.
Dependencies are inferred from the claim text.