# US 11,440,418 B2 · Control system for electric vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,440,418 B2 - Document ID: US11440418B2 - Status: Granted - Kind: B2 - Application number: 16/794,337 - Filed: 2020-02-19 - Published: 2020-08-27 - Granted: 2022-09-13 - Earliest claimed: 2019-02-25 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Hideaki Otsubo; Daijiro Kawasaki - Web page: https://patentgrep.com/patent/US11440418B2 ## CPC - B60L 15/2009: {for braking} - B60L 7/18: Controlling the braking effect (B60L7/12, B60L7/14, B60L7/16 take precedence) - B60W 50/16: Tactile feedback to the driver, e.g. vibration or force feedback to the driver on the steering wheel or the accelerator pedal - F16H 59/08: Range selector apparatus - B60L 2240/423: Torque - Y02T 10/72: Electric energy management in electromobility - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - 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 - F16H: GEARING - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A control system for an electric vehicle configured to allow a driver to grasp the situation of the electric vehicle when launching the electric vehicle by operating a brake pedal, and to reduce electric consumption of a motor. A controller controls the motor to generate a signal torque when a brake pedal depressed to generate brake force is returned so as to allow the driver to sense a change in a behavior of the vehicle, and terminate generation of the signal torque by the motor before the brake force is reduced to zero. ## Claims ### Claim 1 A control system for an electric vehicle having a prime mover including at least a motor, a brake device that is operated by a driver to generate a brake force, and a detector that collects data relating to the brake force, comprising: a controller that is configured to control the motor to generate a signal torque when the brake device operated to generate the brake force to stop the electric vehicle is returned to reduce the brake force to zero, so as to allow the driver to sense a change in a behavior of the electric vehicle resulting from returning the brake device, and terminate generation of the signal torque by the motor before the brake force is reduced to zero. ### Claim 2 (depends on 1) The control system for the electric vehicle as claimed in claim 1, wherein the signal torque includes a drive torque generated by the motor possible to generate vibrations sensible by the driver while keeping the electric vehicle to stop. ### Claim 3 (depends on 1) The control system for the electric vehicle as claimed in claim 1, wherein the electric vehicle comprises a shifting device that is shifted by the driver between a drive position to select a drive range in which a drive force is established by delivering an output torque of the prime mover to drive wheels, and a non-driving position to select a non-driving range in which the output torque of the prime mover is not delivered to the drive wheels so as not to establish the drive force, the detector detects a position of the shifting device, and the controller is further configured to control the motor to generate the signal torque in a same direction as a drive torque to propel the electric vehicle in the forward direction when the shifting device is positioned in the drive position. ### Claim 4 (depends on 3) The control system for the electric vehicle as claimed in claim 3, wherein the controller is further configured to control the motor to generate the signal torque in an opposite direction to the drive torque, after generating the signal torque in the same direction as the drive torque by the motor. ### Claim 5 (depends on 1) The control system for the electric vehicle as claimed in claim 1, wherein the controller is further configured to control the motor in such a manner that an absolute value of the drive force established by generating the signal torque by the motor will not exceed an absolute value of the brake force. ### Claim 6 (depends on 1) The control system for the electric vehicle as claimed in claim 1, wherein the controller is further configured not to generate the signal torque by the motor if a speed to reduce the brake force to zero is faster than a predetermined speed.