US 2017/0267239 A1Published application

Vehicle drive system

AssigneeHonda Motor Co., Ltd.

InventorsYasushi NAKOJI, Takaaki KUWABARA, Takashi HOSHI

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Abstract

A vehicle drive system includes an internal combustion engine, a clutch, an engine rotation speed detector, an output shaft rotation speed detector, and a processor. The internal combustion engine includes cylinders and a crankshaft. The clutch is connected to the crankshaft via a torsion element and includes an output shaft. The engine rotation speed detector detects a crankshaft rotation speed. The output shaft rotation speed detector detects an output shaft rotation speed. The processor is configured to calculate a torque generated in each of the cylinders based on the crankshaft rotation speed. The processor is configured to decrease transmission torque of the clutch so that a difference between the crankshaft rotation speed and the output shaft rotation speed to be a target value when misfiring occurs. The processor is configured to identify a misfiring cylinder among the cylinders based on the torque calculated while the transmission torque is decreased.

Claims10

Dependent claims

A vehicle drive system including an internal combustion engine having a plurality of cylinders, with a crankshaft of the engine connected to a motive force transmission mechanism through a torsion element and a clutch, and the motive force transmission mechanism coupled to a driveshaft of a vehicle, the vehicle drive device comprising:

an engine rotation speed parameter detection unit that detects an engine rotation speed parameter indicating the rotation speed of the crankshaft;
an output shaft rotation speed parameter detection unit that detects an output shaft rotation speed parameter indicating a rotation speed of an output shaft of the clutch;
a misfire determination parameter computation unit that computes a misfire determination parameter indicating torque generated for each cylinder of the engine based on the detected engine rotation speed parameter;
a misfire determination unit that determines misfiring of the engine based on the misfire determination parameter;
a transmission torque reduction control unit that, when misfiring of the engine has been detected by the misfire determination unit, decreases transmission torque of the clutch so as to match a difference between the engine rotation speed parameter and the output shaft rotation speed parameter to a target value;
and
a misfiring cylinder identification unit that identifies cylinders in which misfiring is occurring based on the misfire determination parameter computed in a state in which the transmission torque has been decreased by the transmission torque reduction control unit.

4 more elements

A vehicle drive system comprising:

an internal combustion engine including cylinders and a crankshaft;
a clutch connected to the crankshaft via a torsion element and including an output shaft;
an engine rotation speed detector to detect a crankshaft rotation speed;
an output shaft rotation speed detector to detect an output shaft rotation speed of the clutch;
and
a processor configured to
calculate a torque generated in each of the cylinders based on the crankshaft rotation speed,
determine whether misfiring occurs in the engine based on the torque calculated,
decrease transmission torque of the clutch so that a difference between the crankshaft rotation speed and the output shaft rotation speed to be a target value when it is determined that misfiring occurs, and
identify a misfiring cylinder among the cylinders based on the torque calculated while the transmission torque is decreased.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/455,130Filed 10 Mar 2017
Priority: JP 2016-05468118 Mar 2016
Published: 21 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification24 codes

B60W 30/184
Propelling the vehicle: preventing damage resulting from overload or excessive wear of the driveline
B60K 28/10
Safety devices for propulsion-unit control, specially adapted for, or arranged in, vehicles, e.g. preventing fuel supply or ignition in the…
B60W 10/02
Conjoint control of vehicle sub-units of different type or different function: including control of driveline clutches
B60W 10/06
Including control of propulsion units: including control of combustion engines