# US 10,118,494 B2 · Vehicle control method and vehicle control device

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,118,494 B2
- Document ID: US10118494B2
- Status: Granted
- Kind: B2
- Application number: 15/572,955
- Filed: 2015-06-15
- Published: 2018-05-03
- Granted: 2018-11-06
- Earliest claimed: 2015-06-15
- Assignees: Nissan Motor Co., Ltd.
- Applicants: Nissan Motor Co., Ltd.
- Inventors: Yuuki Ozawa; Youko Yoshioka; Takao Andou
- Web page: https://patentgrep.com/patent/US10118494B2

## CPC

- B60L 9/18: fed from DC supply lines
- B60K 6/48: Parallel type
- B60K 6/543: the transmission being a continuously variable transmission
- B60L 15/2009: {for braking}
- B60W 10/02: including control of driveline clutches
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60W 10/30: including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- B60W 20/40: Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers {(power-up or power-down of the driveline B60W30/192)}
- B60W 30/18054: {at stand still, e.g. engine in idling state (hill holding B60W30/18118)}
- B60W 30/20: Reducing vibrations in the driveline
- F16D 48/06: Control by electric or electronic means, e.g. of fluid pressure
- B60W 20/14: in conjunction with braking regeneration
- B60W 2520/04: Vehicle stop
- B60W 2710/081: Speed
- B60W 2710/083: Torque
- F16D 2500/1045: Friction clutch
- F16D 2500/30401: On-off signal indicating the engage or disengaged position of the clutch
- F16D 2500/3067: Speed of the engine
- F16D 2500/3108: Vehicle speed
- F16D 2500/3111: Standing still, i.e. signal detecting when the vehicle is standing still or bellow a certain limit speed
- F16D 2500/31493: Switches on the dashboard
- F16D 2500/70424: Outputting a clutch engaged-disengaged signal
- F16D 2500/70454: Engine speed
- Y02T 10/62: Hybrid vehicles
- Y02T 10/64: Electric machine technologies in electromobility
- 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
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN 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
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A vehicle control method is provided for controlling a vehicle having a friction clutch configured to switch between engagement and disengagement between a motor/generator and a drive wheel. The vehicle control method includes maintaining a friction clutch disengaged with slack eliminated in a stroke while the vehicle is stopped, reducing a motor rotational speed using a predetermined rotational speed as a target motor rotational speed in response a request to stop a motor/generator upon determining the motor rotational speed of the motor/generator is greater than the predetermined rotational speed, and when the motor rotational speed has reached the predetermined rotational speed, reducing the motor rotational speed toward zero while limiting the torque of the motor/generator.

## Claims

### Claim 1

A vehicle control method for controlling a vehicle comprising a friction clutch configured to switch between engagement and disengagement between a motor/generator and a drive wheel, an oil pump that supplies hydraulic oil pressure to the friction clutch, and an electric oil pump driven by an electric motor to supply hydraulic oil pressure to the friction clutch, the vehicle control method comprising:
maintaining the friction clutch disengaged with slack eliminated in a stroke while the vehicle is stopped,
reducing a motor rotational speed using a predetermined rotational speed as a target motor rotational speed in response a request to stop the motor/generator upon determining the motor rotational speed of the motor/generator is greater than the predetermined rotational speed, and
when the motor rotational speed has reached the predetermined rotational speed, reducing the motor rotational speed toward zero while limiting torque of the motor/generator.

### Claim 2 (depends on 1)

The vehicle control method as recited in claim 1, wherein
when the motor rotational speed reaches the predetermined rotational speed, maintaining the motor rotational speed at the predetermined rotational speed until a predetermined time has elapsed, after which the limiting of the torque of the motor/generator is started.

### Claim 3 (depends on 2)

The vehicle control method as recited in claim 2, wherein
the target motor rotational speed when limiting the torque of the motor/generator is set to the predetermined rotational speed.

### Claim 4 (depends on 1)

The vehicle control method as recited in claim 1, wherein
the target motor rotational speed when limiting the torque of the motor/generator is set to the predetermined rotational speed.

### Claim 5

A vehicle control device comprising:
a friction clutch configured to switch between engagement and disengagement between a motor/generator and a drive wheel,
an oil pump configured to supply hydraulic oil pressure to the friction clutch,
an electric oil pump that is driven by an electric motor to supply hydraulic oil pressure to the friction clutch, and
a control unit that maintains the friction clutch disengaged with slack eliminated in a stroke while the vehicle is stopped, that reduces the motor rotational speed using a predetermined rotational speed as a target motor rotational speed in response to a request to stop the motor/generator, if the motor rotational speed of the motor/generator is greater than the predetermined rotational speed, and reduces the motor rotational speed toward zero that when the motor rotational speed has reached the predetermined rotational speed while limiting torque of the motor/generator.