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Stability control system for vehicle

  • US 6,053,583 A
  • Filed: 03/27/1998
  • Issued: 04/25/2000
  • Est. Priority Date: 03/31/1997
  • Status: Expired due to Fees
First Claim
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1. A system of driving stability control for a vehicle equipped with a braking system for controlling driving stability of the vehicle according to vehicle driving conditions of applying braking force selectively and independently to respective wheels, said system of driving stability control comprising:

  • a master cylinder for developing braking pressure according to pedal travels by which a brake pedal is pressed down;

    hydraulic pressure distribution means for distributing said braking pressure to a brake unit of each said wheel from said master cylinder therethrough;

    opening/closing means disposed in said hydraulic pressure distribution means for opening said hydraulic pressure distribution means to distribute said braking pressure to said brake unit and closing said hydraulic pressure distribution means to prevent distribution of said braking pressure to said brake unit;

    pressuring means installed to said hydraulic pressure distribution means downstream from said opening/closing means to pressurize said braking pressure to be supplied to said brake unit;

    pressure relief means connected to said brake unit to relieve said braking pressure from said brake unit;

    driving condition monitoring means for monitoring a driving condition of the vehicle;

    pressure detecting means for detecting a step-on pressure which with a brake pedal is stepped on; and

    control means for controlling said opening/closing means so as to close said hydraulic pressure distribution means which said driving condition monitoring means detects a specified driving condition, executing driving stability control by which said pressurizing means and said pressure relief means are controlled so as to apply braking force selectively and independently to said brake units when said driving condition monitoring means detects a specified driving condition, executing coordinated braking control by which, when said pressure detecting means detects a specified step-on pressure during execution of said driving stability control, said braking pressure is delivered to said brake units according to said pedal travels while said driving stability control is continued, rectifying said driving stability control so as to make a participative degree of said driving stability control smaller while said step-on pressure is higher than said specified step-on pressure than while said step-on pressure is lower than said specifies step-on pressure, judging whether said driving condition causes a spin of the vehicle, and restraining said rectification of said driving stability control while said step-on pressure is higher than said specified step-on pressure when judging said driving condition to cause a spin of the vehicle.

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