Patent ID: 7934779
Filing Date: 2011-05-03
Classification: B60K,B60L,B60T,B60W,Y02T

Abstract:
1. A vehicle, comprising: an internal combustion engine capable of outputting power; a motor capable of outputting at least a regenerative braking force to an axle of the vehicle; an accumulator unit that transmits electric power to and from the motor; a fluid pressure braking structure having a pressurization unit for pressurizing an operation fluid, the fluid pressure braking structure capable of outputting a braking force by utilizing an operational pressure of the operation fluid produced according to a driver's braking operation and a negative pressure produced by the internal combustion engine, and an increased pressure of the operation fluid produced by pressurization of the operation fluid by the pressurization unit; a braking force demand setting module that sets the braking force demand required by the driver in response to the driver's braking operation; a braking control module that controls the motor and the fluid pressure braking structure to satisfy the set braking force demand by a total of the regenerative braking force and the operational braking force when a sum of the regenerative braking force produced by the motor and an operational braking force based on the operational pressure is sufficient for the braking force demand set in response to the driver's braking operation, the braking control module controlling the motor and the fluid pressure braking structure to satisfy the set braking force demand by a total of the regenerative braking force, the operational braking force, and a braking force based on the increased pressure of the operation fluid when the sum of the regenerative braking force produced by the motor and the operational braking force based on the operational pressure is insufficient for the braking force demand set in response to the driver's braking operation; an operational pressure detection unit that detects the operational pressure; a negative pressure measurement unit that measures the negative pressure produced by the internal combustion engine; and a regenerative braking force setting module that sets a regenerative braking force obtainable by regeneration of the motor in response to the driver's braking operation, wherein the braking force demand setting module sets the braking force demand based on the detected operational pressure and the measured negative pressure, and wherein the braking control module controls the pressurization unit based on a result of subtraction of the set regenerative braking force and an operational braking force based on the detected operational pressure from the set braking force demand.