Braking force distribution control for a four wheel drive vehicle
AssigneeNisshinbo Industries, Inc.
InventorsHiroshi Oshiro, Wataru Ozawa, Yutaka Tanaka, Norihiko Usui
Life of this patent
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Abstract
A method for braking force distribution control for a vehicle with a direct four wheel drive mode, which does not become an obstacle to an effective braking force and disconcert the driver's feeling. This method relates to a braking force distribution control for a vehicle during direct four wheel drive mode and under the condition that the anti-skid control is inhibited, which does not operate pressure reduction control or the amount of pressure reduction.
Claims6
A method for braking force distribution control for a four wheel drive vehicle, said vehicle uses a direct four wheel drive mode for operating anti-skid control and braking force distribution control, said vehicle has a hydraulic unit comprising a main hydraulic circuit connected between a master cylinder and an inlet valve via a wheel cylinder and an auxiliary hydraulic circuit connected between said wheel cylinder and an auxiliary reservoir via an outlet valve, a wheel speed sensor determines respective wheel speed of each of four wheels of said four wheel drive vehicle, and an electronic control device to control said hydraulic unit, wherein
- said braking force distribution control for the vehicle, during said direct four wheel drive mode and under a condition that said anti-skid control is inhibited, does not operate pressure reduction control and does not limit an amount of pressure reduction in said hydraulic unit.
A method for braking force distribution control for a four wheel drive vehicle, said vehicle uses a direct four wheel drive mode for operating anti-skid control and braking force distribution control, said vehicle has a hydraulic unit comprising a main hydraulic circuit connected between a master cylinder and an inlet valve via a wheel cylinder and an auxiliary hydraulic circuit connected between said wheel cylinder and an auxiliary reservoir via an outlet valve, a wheel speed sensor determines respective wheel speed of each of four wheels of said four wheel drive vehicle, and an electronic control device to control said hydraulic unit, wherein
- during said direct four wheel drive mode and under a condition that said anti-skid control is inhibited, said braking force distribution control for the vehicle increases pressure in said hydraulic unit if vehicle vibration is detected.
A method for braking force distribution control in a four wheel vehicle including a hydraulic unit comprising a main hydraulic circuit connected between a master cylinder and an inlet valve via a wheel cylinder and an auxiliary hydraulic circuit connected between said wheel cylinder and an auxiliary reservoir via an outlet valve, said method comprising the steps of:
- prohibiting pressure reduction and prohibiting a limit in the amount of pressure reduction in said wheel cylinder when said vehicle is in said direct four wheel drive mode and said anti-skid control is inhibit.
A method for braking force distribution control in a four wheel vehicle including a hydraulic unit comprising a main hydraulic circuit connected between a master cylinder and an inlet valve via a wheel cylinder and an auxiliary hydraulic circuit connected between said wheel cylinder and an auxiliary reservoir via an outlet valve, said method comprising the steps of:
- detecting vehicle vibration;
- and
- increasing pressure in said wheel cylinder in response to said step of detecting vehicle vibration when said vehicle is in a direct four wheel drive mode and an anti-skid control is inhibited.
Dependencies are inferred from the claim text.