초록 ▼

An electronically controlled vehicular hydraulic brake system provides anti-lock braking, traction control, and vehicle stability control. The system includes a hydraulic control unit (HCU) containing control valves and other components in fluid communication with wheel brakes. Low temperatures caus

An electronically controlled vehicular hydraulic brake system provides anti-lock braking, traction control, and vehicle stability control. The system includes a hydraulic control unit (HCU) containing control valves and other components in fluid communication with wheel brakes. Low temperatures cause the viscosity of hydraulic fluid to increase. Performance of the braking system can be improved at low temperatures according to methods of this invention. A first preferred method of improving braking performance is to increase the brake fluid temperature inside the HCU. Several examples of methods to increase fluid temperature inside the HCU are presented. A second preferred method of improving braking performance is to preload the wheel brakes with a pressure that does not adversely affect normal driving. Several examples of methods to preload the wheel brakes are presented.

대표청구항 ▼

1. A control unit for an electronically controlled vehicular braking system comprising:a hydraulic control unit having a housing comprising a metallic block, the housing having bores and conduits receiving hydraulic fluid, and the housing further having a bore which is not in fluid communication wit

1. A control unit for an electronically controlled vehicular braking system comprising:a hydraulic control unit having a housing comprising a metallic block, the housing having bores and conduits receiving hydraulic fluid, and the housing further having a bore which is not in fluid communication with the hydraulic fluid; a control valve mounted on the housing of the hydraulic control unit; a pump mounted on the housing of the hydraulic control unit; an electronic control unit mounted to the housing of the hydraulic control unit; an electric motor mounted to the housing of the hydraulic control unit; a heating device received in the bore in the housing of the hydraulic control unit which is not in fluid communication with the hydraulic fluid, and the heating device electrically connected to the electronic control unit and to the electric motor.