# US 2013/0154344 A1 · Electric vehicle brake control device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0154344 A1 - Document ID: US20130154344A1 - Status: Published application - Kind: A1 - Application number: 13/820,114 - Filed: 2011-09-30 - Published: 2013-06-20 - Earliest claimed: 2010-11-08 - Assignees: Nissan Motor Co., Ltd. - Inventors: Masayuki Imamura - Web page: https://patentgrep.com/patent/US20130154344A1 ## CPC - B60T 8/17: Using electrical or electronic regulation means to control braking {(detecting or indicating faulty operation B60T8/885)} - B60T 8/1755: Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve (road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02) - B60T 8/4045: {involving ON/OFF switching} - B60T 8/4872: {pump-back systems} - B60T 13/20: with control of pump driving means - B60T 13/586: {the retarders being of the electric type} - B60W 10/08: including control of electric propulsion units, e.g. motors or generators - B60W 30/18127: {Regenerative braking} - B60T 2270/604: Merging friction therewith; Adjusting their repartition - B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES - B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT ## Abstract A vehicle brake control device includes a master cylinder, a plurality of wheel cylinders, a VDC brake hydraulic pressure unit, a motor controller and an integration controller. When a brake operation is carried out, the integration controller carries out a regenerative brake control which achieves a target deceleration. Additionally, a motor suspension control is carried out which suspends a drive status of the VDC motor when the vehicle velocity is less than a first prescribed value. Furthermore, when the vehicle velocity exceeds a second prescribed value and the brake operation is carried out while the VDC motor is in the suspended status, the value of the target deceleration is set to a lower value than the value of the target deceleration which the driver requests, and a motor reactivation control is carried out which reactivates the VDC motor. ## Claims ### Claim 1 A vehicle brake control device for an electrically driven vehicle, comprising: a master cylinder that generates a master cylinder pressure in accordance with a braking operation; a wheel cylinder is disposed at each front and rear wheels to supply a hydraulic pressure braking power to a corresponding one of the front and rear wheels; a brake hydraulic pressure actuator interposed between the master cylinder and the wheel cylinders, and the brake hydraulic pressure actuator including a hydraulic pressure pump driven by a pumping motor and a differential valve for controlling the pressure difference between a wheel cylinder pressure and the master cylinder pressure during operation of the pumping motor; a regenerative brake force control unit is connected to an electric drive motor that is coupled to a drive wheel, the regenerative brake force control unit controlling a regenerative brake force that is generated by the electric drive motor; a regenerative cooperative brake control unit that achieves a target deceleration at the braking operation by a sum of a base hydraulic pressure portion of the master cylinder pressure and a regenerative portion of the regenerative brake force, and further compensates for a shortage of the regenerative portion by an add-on pressure portion generated by the brake hydraulic pressure actuator; a motor stop control unit that stops the pumping motor from operating upon the vehicle speed falling below a first predetermined vehicle speed value; and a motor restart control unit that sets the target deceleration value lower than the target deceleration of a driver's request and restarts the pumping motor upon determining the vehicle speed exceeding a second predetermined vehicle speed value and brake is operated while the pumping motor is in a stopped state. ### Claim 2 (depends on 1) The vehicle brake control device as claimed in claim 1, wherein the motor restart control unit sets the target deceleration value by subtracting from the target deceleration value which the driver requests at the vehicle speed exceeding the first predetermined vehicle speed value at least a portion corresponding to an overshoot of an actual deceleration caused by an excessive rotation of the pumping motor. ### Claim 3 (depends on 1) The vehicle brake control device as claimed in claim 1, wherein the motor restart control unit determines the target deceleration value in accordance with a first target deceleration calculation map that is based on a brake pedal operation amount where the target deceleration value is smaller in the first target deceleration calculation map for values of the brake pedal operation amount that are less than a predetermined value than in a second target deceleration map that is used while the vehicle speed is equal to or greater than the first predetermined vehicle speed. ### Claim 4 (depends on 2) The vehicle brake control device as claimed in claim 2, wherein the motor restart control unit determines the target deceleration value in accordance with a first target deceleration calculation map that is based on a brake pedal operation amount where the target deceleration value is smaller in the first target deceleration calculation map or values of the brake pedal operation amount that are less than a predetermined value than in a second target deceleration calculation map that is used while the vehicle speed is equal to or greater than the first predetermined vehicle speed.