Control device for hybrid system
AssigneeDenso Corporation
InventorTakahiro KONDO
Life of this patent
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Abstract
When switching an operation state of an engine in a hybrid system from a lean burn operation to a stoichiometry operation, the lean burn operation is once switched to a rich operation and then switched to the stoichiometry operation. During a period from before switching to the rich operation to after switching to the rich operation, an intake air restriction for restricting an amount of intake air to the engine is performed. As a result, the amount of intake air is made smaller than when the intake air restriction is not performed. Further, during the period in which the intake air restriction is performed before switching to the rich operation, a fuel cut for cutting fuel to the engine is performed.
Claims9
A control device for controlling a hybrid system having an engine and a motor with a three-way catalyst in an exhaust system of the engine, and driving a drive object by at least the motor, the control device comprising:
- a rich operation unit that switches from a lean burn operation to a rich operation once and then switches to a stoichiometry operation when switching an operation state of the engine from the lean burn operation to the stoichiometry operation;
- an intake air restriction unit that performs an intake air restriction for restricting an intake air amount to the engine during a period from before switching to the rich operation to after switching to the rich operation, to reduce the intake air amount compared to a case where the intake air restriction is not performed;
- and
- a fuel cut unit that performs a fuel cut for stop supplying fuel to the engine while performing the intake air restriction before switching to the rich operation.
Dependencies are inferred from the claim text.