# US 9,517,762 B2 · Control apparatus for internal combustion engine

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- Number: US 9,517,762 B2
- Document ID: US9517762B2
- Status: Granted
- Kind: B2
- Application number: 14/896,189
- Filed: 2014-06-04
- Published: 2016-04-28
- Granted: 2016-12-13
- Earliest claimed: 2013-06-07
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Takashi Kawai; Mitsumasa Fukumura; Hiroshi Sugimura; Satoshi Maeda
- Web page: https://patentgrep.com/patent/US9517762B2

## CPC

- B60W 20/15: Control strategies specially adapted for achieving a particular effect
- B60K 6/24: characterised by the combustion engines
- B60K 6/445: Differential gearing distribution type
- B60L 50/16: with provision for separate direct mechanical propulsion
- B60W 10/06: including control of combustion engines
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- 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)}
- F02D 17/00: Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling (controlling or rendering inoperative by varying inlet or exhaust valve operating characteristics F02D13/00)
- F02D 29/02: peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
- B60W 2510/06: Combustion engines, Gas turbines
- B60W 2510/0685: Engine crank angle
- B60W 2710/06: Combustion engines, Gas turbines
- B60W 2710/083: Torque
- B60Y 2300/45: Engine shutdown at standstill
- Y02T 10/62: Hybrid vehicles
- Y02T 10/84: Data processing systems or methods, management, administration
- Y10S 903/903: having energy storing means, e.g. battery, capacitor
- 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
- 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
- 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
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A control apparatus of the invention is applied to a three-cylinder internal combustion engine that is mounted in a vehicle and in which a first MG is connected to a crankshaft in a manner capable of transmitting power. When stopping the internal combustion engine, a vehicle control unit controls output torque of the first MG such that the internal combustion engine is stopped in a state where a preset particular cylinder is in a compression stroke. The particular cylinder is a cylinder in which a mutually weakening relationship is established between a vibration component that is generated due to precession in the internal combustion engine when the internal combustion engine is started from the state where this particular cylinder is in the compression stroke and a vibration component that is predicted to be generated in the vehicle when it is assumed that torque to be applied to the crankshaft at a startup of the internal combustion engine is applied to the crankshaft in a state where a piston and a connecting rod of each cylinder are detached.

## Claims

### Claim 1

A control apparatus applied to a three-cylinder internal combustion engine that is mounted in a vehicle and in which an electric motor is connected to a crankshaft in a manner capable of transmitting power, the control apparatus comprising
control unit configured to control output torque of the electric motor at a time that the internal combustion engine is stopped such that the internal combustion engine is stopped in a state where a preset particular cylinder is in a compression stroke or an expansion stroke, wherein
the particular cylinder is a cylinder in which a mutually weakening relationship is established between a vibration component generated due to precession of the internal combustion engine in the case where the internal combustion engine is started from the state where said particular cylinder is in the compression stroke or the expansion stroke and a vibration component predicted to be generated in the vehicle in the case where it is assumed that torque to be applied to the crankshaft at a startup of the internal combustion engine is applied to the crankshaft in a state where a piston and a connecting rod of each cylinder are detached.

### Claim 2 (depends on 1)

The control apparatus according to claim 1, wherein
in the case where a specified engine stop condition is established and a crank angle of the internal combustion engine falls within a preset specified determination crank angle range, the control unit is configured to stop combustion of the internal combustion engine and then executes speed lowering control for lowering a rotational speed of the crankshaft by outputting torque from the electric motor, and
a crank angle range in which the internal combustion engine is stopped in a state where the particular cylinder is in the compression stroke or the expansion stroke by starting the speed lowering control when the crank angle of the internal combustion engine falls within the determination crank angle range is set as the determination crank angle range.

### Claim 3 (depends on 2)

The control apparatus according to claim 2, wherein
the vehicle is provided with an operation switch through which a driver commands the vehicle to travel in a mode that prioritizes fuel economy, and
the control unit is configured to
stop combustion of the internal combustion engine and then executes the speed lowering control in the case where the operation switch is OFF, the engine stop condition is established, and the crank angle of the internal combustion engine falls within the determination crank angle range, and
stop the combustion of the internal combustion engine and then executes the speed lowering control in the case where the operation switch is ON and the engine stop condition is established.

### Claim 4 (depends on 1)

The control apparatus according to claim 1, wherein
in the case where the specified engine stop condition is established, the control unit configured to stop combustion of the internal combustion engine and then executes speed control for lowering a rotational speed of the crankshaft by outputting torque from the electric motor, and
a magnitude of the torque output from the electric motor in the speed control is set such that the particular cylinder is brought into the state of the compression stroke or the expansion stroke when the internal combustion engine is stopped.