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US 2002/0117339 A1Published application
Parallel hybrid electric vehicle
AssigneeJatco Transtechnology Ltd.
InventorKenji Nakashima
Life of this patent
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Abstract
In a parallel hybrid electric vehicle, when the difference in number of revolutions between an engine and a motor/generator is smaller than a predetermined value at starting of the vehicle, an ECU sets a predetermined torque correction amount in accordance with the relationship between an engine inertia and a motor/generator inertia. The ECU carries out correction of torque of one of the engine and the motor/generator in accordance with the predetermined torque correction amount as set.
Claims13
A parallel hybrid electric vehicle, comprising:
- an engine;
- a motor/generator having functions of a motor and a generator;
- a transmission;
- a differential gear comprising a first shaft connected to an output shaft of the engine, a second shaft connected to an output shaft of the motor/generator, and a third shaft connected to an input shaft of the transmission;
- an engagement device interposed between two of the first to third shafts of the differential gear, the engagement device being engaged when a difference in number of revolutions between the engine and the motor/generator is smaller than a predetermined value at starting of the vehicle;
- and
- an electronic control unit (ECU) which controls operating conditions of at least one of the engine and the motor/generator,
- wherein when the difference in number of revolutions is smaller than the predetermined value, the ECU sets a predetermined torque correction amount in accordance with a relationship between an inertia of the engine and that of the motor/generator, and
- wherein the ECU carries out a correction of torque of one of the engine and the motor/generator in accordance with the predetermined torque correction amount as set.
6 more elements
A parallel hybrid electric vehicle, comprising:
- an engine;
- a motor/generator having functions of a motor and a generator;
- a transmission;
- a differential gear comprising a first shaft connected to an output shaft of the engine, a second shaft connected to an output shaft of the motor/generator, and a third shaft connected to an input shaft of the transmission;
- an engagement device which carries out engagement and release between two of the first to third shafts of the differential gear;
- and
- an electronic control unit (ECU) which, at starting of the vehicle, puts the engagement device in a non-engaged state and controls torque of the motor/generator to maintain a number of revolutions of the engine at a predetermined number,
- wherein the ECU puts the engagement device in an engaged state when numbers of revolutions of the first to third shafts of the differential gear agree at least substantially with each other, and
- wherein the ECU carries out one of the following operations of:
- decreasing the torque of the motor/generator at engagement of the engagement device when an inertia of the motor/generator is smaller than a value obtained by multiplying an inertia of the engine by a gear ratio of the differential gear;
- increasing the torque of the motor/generator at engagement of the engagement device when the motor/generator inertia is larger than the value;
- increasing the torque of the motor/generator at engagement of the engagement device when the motor/generator inertia is smaller than the value;
- and
- decreasing the torque of the motor/generator at engagement of the engagement device when the motor/generator inertia is larger than the value.
11 more elements
Dependencies are inferred from the claim text.