Engine control system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHideki Nakazono, Daisuke Akihisa
Life of this patent
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Abstract
A hybrid type vehicle designed to use an engine and motor generators to drive the vehicle, wherein the engine is provided with a variable compression ratio mechanism and a variable valve timing mechanism. When the vehicle is backing up, one motor generator is used to generate an output for vehicle drive use. If the engine is made to operate at this time, the engine torque and the engine speed are made to change along a minimum fuel consumption rate operation line.
Claims5
An engine control system comprising an output regulating system which has a pair of motor generators and which receives as input an output of an engine and generates an output for vehicle drive use, the output regulating system being formed so that an output torque of the engine is split to the motor generators, wherein the engine is provided with a compression ratio mechanism which is able to change a mechanical compression ratio and a variable valve timing mechanism which is able to control a closing timing of an intake valve, one of the motor generators is used to generate the output for vehicle drive use when the vehicle is backing up, if the engine is operated at this time, a reverse rotation direction torque acts on the other motor generator and that other motor generator is used for a power generation action, and, at this time, at the engine, the mechanical compression ratio is maintained at a predetermined compression ratio or more and the closing timing of the intake valve is held at a side away from intake bottom dead center.
An engine control system as claimed in claim wherein said predetermined compression ratio is 20.
Dependencies are inferred from the claim text.