# US 2014/0194246 A1 · Control device for hybrid vehicle

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- Number: US 2014/0194246 A1
- Document ID: US20140194246A1
- Status: Published application
- Kind: A1
- Application number: 14/139,431
- 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; Shigetoshi HIRANO; Yusuke SASAKI
- Web page: https://patentgrep.com/patent/US20140194246A1

## CPC

- B60K 6/442: Series-parallel switching type
- B60W 10/02: including control of driveline clutches
- B60W 10/06: including control of combustion engines
- B60W 20/20: Control strategies involving selection of hybrid configuration, e.g. selection between series or parallel configuration
- B60W 20/50: Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
- B60W 2510/0241: Clutch slip, i.e. difference between input and output speeds
- B60W 2710/0644: Engine speed
- F16H 61/0206: {Layout of electro-hydraulic control circuits, e.g. arrangement of valves}
- F16H 61/061: {using electric control means}
- F16H 61/12: Detecting malfunction or potential malfunction, e.g. fail safe (in control of hydrostatic gearing F16H61/4192) {; Circumventing or fixing failures}
- Y02T 10/62: Hybrid vehicles
- Y10S 903/946: Characterized by control of driveline clutch
- 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
- F16H: GEARING
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

In a series mode, a clutch rotational speed difference ΔN is calculated, and when the clutch rotational speed difference ΔN is within a first predetermined range R1, it is determined whether a sticking determination timer t indicates a first predetermined time t1 or longer. When a closed sticking timer t indicates the first predetermined time t1 or longer, fuel cut is performed, and the clutch rotational speed difference ΔN is re-calculated. When the closed sticking timer t indicates a second predetermined time t2 or longer, and the clutch rotational speed difference ΔN is within a second predetermined range R2, it is determined that there is closed sticking of a clutch. When the closed sticking timer t indicates less than the time t2, and the clutch rotational speed difference ΔN is out of the second predetermined range R2, it is determined that there is no closed sticking of the clutch.

## Claims

### Claim 1

A control device for a hybrid vehicle comprising:
an internal combustion engine provided in the vehicle;
a power generator that is driven by the internal combustion engine to generate electric power;
a secondary battery that stores the electric power generated by the power generator;
an electric motor that drives drive wheels of the vehicle using electric power supplied from the secondary battery;
a clutch that connects/disconnects a transmission path that transmits power from the internal combustion engine to the drive wheels;
a mode switching unit for switching between a first travel mode in which the clutch is released, the internal combustion engine drives the power generator to generate electric power, and the electric motor drives the drive wheels to cause the vehicle to travel, and a second travel mode in which the clutch is connected, and power of the internal combustion engine is transmitted to the drive wheels to cause the vehicle to travel;
a rotational speed difference detection unit for detecting a difference between a rotational speed of an upstream clutch provided on a side of the internal combustion engine of the transmission path and a rotational speed of a downstream clutch provided on a side of the drive wheels of the transmission path;
a rotational speed variable unit for performing rotational speed variable control to change the rotational speed of the upstream clutch provided on the side of the internal combustion engine when the difference between the rotational speeds detected by the rotational speed difference detection unit is held within a predetermined range for a predetermined period in the first travel mode; and
a sticking determination unit for performing sticking determination of the clutch based on the difference between the rotational speeds in the rotational speed variable control.

### Claim 2 (depends on 1)

The control device for a hybrid vehicle according to claim 1, wherein
the rotational speed variable unit reduces output torque of the internal combustion engine to change the rotational speed of the upstream clutch provided on the side of the internal combustion engine in the rotational speed variable control.

### Claim 3 (depends on 1)

The control device for a hybrid vehicle according to claim 1, wherein
the rotational speed variable unit stops supply of fuel to the internal combustion engine to reduce the output torque of the internal combustion engine in the rotational speed variable control.

### Claim 4 (depends on 2)

The control device for a hybrid vehicle according to claim 2, wherein
the rotational speed variable unit stops supply of fuel to the internal combustion engine to reduce the output torque of the internal combustion engine in the rotational speed variable control.

### Claim 5 (depends on 1)

The control device for a hybrid vehicle according to claim 1, wherein
the rotational speed variable unit delays ignition timing of the internal combustion engine to reduce the output torque of the internal combustion engine in the rotational speed variable control.

### Claim 6 (depends on 2)

The control device for a hybrid vehicle according to claim 2, wherein
the rotational speed variable unit delays ignition timing of the internal combustion engine to reduce the output torque of the internal combustion engine in the rotational speed variable control.