# US 2014/0195084 A1 · Engine operation control device for hybrid vehicle

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- Number: US 2014/0195084 A1
- Document ID: US20140195084A1
- Status: Published application
- Kind: A1
- Application number: 14/139,413
- Filed: 2013-12-23
- Published: 2014-07-10
- Earliest claimed: 2013-01-09
- Assignees: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
- Applicants: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
- Inventors: Katsunori UEDA; Sumio TANAKA; Shigetoshi HIRANO
- Web page: https://patentgrep.com/patent/US20140195084A1

## CPC

- B60W 20/20: Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
- B60K 6/442: Series-parallel switching type
- B60W 10/06: including control of combustion engines
- B60W 2555/20: Ambient conditions, e.g. wind or rain
- B60W 2555/40: Altitude
- B60W 2710/0644: Engine speed
- F02D 29/06: peculiar to engines driving electric generators
- F02D 31/001: {Electric control of rotation speed}
- F02D 2200/0414: Air temperature
- F02D 2200/10: Parameters related to the engine output, e.g. engine torque or engine speed
- F02D 2200/1006: Engine torque losses, e.g. friction or pumping losses or losses caused by external loads of accessories
- F02D 2200/703: Atmospheric pressure
- Y02T 10/62: Hybrid vehicles
- Y10S 903/93: Conjoint control of different elements
- 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
- 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)
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

An engine operation control device for a hybrid vehicle, including: an engine provided in a vehicle; a power generator that is driven by the engine to generate electric power; a driving battery that is chargeable with electric power supplied from the power generator; and a front motor and a rear motor that drive drive wheels with electric power supplied from the driving battery or the power generator, and allowing a series mode in which the front motor drives front wheels and the rear motor drives rear wheels while the engine is operated at a predetermined set rotational speed to drive the power generator to generate electric power, wherein the set rotational speed is set to increase with decreasing of the atmospheric pressure in a present position of the vehicle in the series mode.

## Claims

### Claim 1

An engine operation control device for a hybrid vehicle, comprising:
an engine provided in a vehicle;
a power generator that is driven by the engine to generate electric power;
a driving battery that is chargeable with electric power supplied from the power generator;
a driving motor that drives drive wheels with electric power supplied from the driving battery or electric power supplied from the power generator;
a mode switching unit for switching a travel mode of the vehicle to a series mode in which the driving motor drives the drive wheels to cause the vehicle to travel while the engine is operated at a predetermined set rotational speed to cause the power generator to generate electric power;
an atmospheric pressure detection unit for detecting atmospheric pressure in a present position of the vehicle; and
a setting unit for setting a rotational speed of the engine so that the set rotational speed increases with decreasing of the atmospheric pressure detected by the atmospheric pressure detection unit in the series mode.

### Claim 2 (depends on 1)

The engine operation control device for a hybrid vehicle according to claim 1, wherein
the setting unit sets the set rotational speed to a constant value in a region with flatland air pressure.

### Claim 3 (depends on 1)

The engine operation control device for a hybrid vehicle according to claim 1, wherein
the engine operation control device further comprises an intake temperature detection unit for detecting an intake temperature of the engine, and
the setting unit sets the set rotational speed so as to increase with increasing of the intake temperature of the engine detected by the intake temperature detection unit.

### Claim 4 (depends on 2)

The engine operation control device for a hybrid vehicle according to claim 2, wherein
the engine operation control device further comprises an intake temperature detection unit for detecting an intake temperature of the engine, and
the setting unit sets the set rotational speed so as to increase with increasing of the intake temperature of the engine detected by the intake temperature detection unit.

### Claim 5 (depends on 1)

The engine operation control device for a hybrid vehicle according to claim 1, wherein
the engine operation control device further comprises a friction estimation unit for estimating friction of the engine, and
the setting unit sets the set rotational speed so as to increase with increasing friction of the engine detected by the friction estimation unit.

### Claim 6 (depends on 2)

The engine operation control device for a hybrid vehicle according to claim 2, wherein
the engine operation control device further comprises a friction estimation unit for estimating friction of the engine, and
the setting unit sets the set rotational speed so as to increase with increasing friction of the engine detected by the friction estimation unit.