# US 12,110,020 B2 · Braking/driving force control system

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- Number: US 12,110,020 B2
- Document ID: US12110020B2
- Status: Granted
- Kind: B2
- Application number: 18/463,489
- Filed: 2023-09-08
- Published: 2023-12-28
- Granted: 2024-10-08
- Earliest claimed: 2019-01-31
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Tomonori Nonami; Shin Nomura; Takeshi Inoguchi; Yoshihide Nakane
- Web page: https://patentgrep.com/patent/US12110020B2

## CPC

- B60T 8/175: Brake regulation specially adapted to prevent excessive wheel spin during vehicle acceleration, e.g. for traction control (safety devices for propulsion unit control responsive to, or preventing, skidding of wheels B60K28/16)
- B60W 30/143: {Speed control (B60W30/16 takes precedence)}
- B60T 8/172: Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)}
- B60W 10/06: including control of combustion engines
- B60W 10/11: Stepped gearings
- B60W 10/184: with wheel brakes
- B60W 30/085: Taking automatic action to adjust vehicle attitude in preparation for collision, e.g. braking for nose dropping
- B60W 30/18136: {Engine braking}
- B60T 2260/04: Automatic transmission
- B60W 10/196: acting within the driveline, e.g. retarders
- B60W 2520/105: Longitudinal acceleration
- B60W 2720/10: Longitudinal speed
- 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 braking/driving force control system, during control for maintaining a target vehicle speed, performs fuel cut and then, when a required braking/driving force for maintaining the target vehicle speed reduces, makes a downshift while fuel cut is continued. The braking/driving force control system causes a brake to generate a braking force such that the sum of a braking/driving force that a powertrain generates and the braking force that the brake generates agrees with the required braking/driving force. Thus, good fuel efficiency and riding comfort are obtained.

## Claims

### Claim 1

A control device that controls a powertrain including an engine and a stepped transmission, the control device comprising:
a fuel cut braking/driving force calculating unit configured to, in a current gear stage of the stepped transmission and a gear stage downshifted from the current gear stage, calculate a first fuel cut braking/driving force corresponding to the current gear stage and a second fuel cut braking/driving force corresponding to the gear stage downshifted from the current gear stage, that are braking/driving forces that the powertrain generates while fuel cut of the engine is performed; and
a shift control unit configured to set a set gear stage of the stepped transmission and perform the fuel cut of the engine in the set gear stage based on a relationship of a required braking/driving force, the first fuel cut braking/driving force, and the second fuel cut braking/driving force.

### Claim 2

A method that is performed by a control device that controls a powertrain including an engine and a stepped transmission, the method comprising:
calculating, in a current gear stage of the stepped transmission and a gear stage downshifted from the current gear stage, a first fuel cut braking/driving force corresponding to the current gear stage and a second fuel cut braking/driving force corresponding to the gear stage downshifted from the current gear stage, that are braking/driving forces that the powertrain generates while fuel cut of the engine is performed, and
setting a set gear stage of the stepped transmission and performing the fuel cut of the engine in the set gear stage based on a relationship of a required braking/driving force, the first fuel cut braking/driving force, and the second fuel cut braking/driving force.

### Claim 3

A non-transitory storage medium storing instructions that are executable by one or more processors and that cause the one or more processors to perform functions comprising:
calculating, in a current gear stage of a stepped transmission and a gear stage downshifted from the current gear stage, a first fuel cut braking/driving force corresponding to the current gear stage and a second fuel cut braking/driving force corresponding to the gear stage downshifted from the current gear stage, that are braking/driving forces that a powertrain generates while fuel cut of an engine is performed, and
setting a set gear stage of the stepped transmission and performing the fuel cut of the engine in the set gear stage based on a relationship of a required braking/driving force, the first fuel cut braking/driving force, and the second fuel cut braking/driving force.