Vehicle control system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsNaoto Moriya, Hideo Watanabe
Life of this patent
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Abstract
A vehicle control system is provided to prevent an occurrence of an engine misfire which may be caused by an execution of ignition retard during lean-burn operation of an engine. The vehicle control system is configured to determine a starting point of an inertia phase when a shifting operation is demanded in the lean-burn mode. The vehicle control system is further configured to switch from the lean-burn mode to the stoichiometric mode before the starting point of the inertia phase, and to execute an ignition retard of the engine in the stoichiometric mode.
Claims2
A vehicle control system that is applied to a vehicle comprising:
- an engine in which an operating mode can be switched between a stoichiometric mode in which an air/fuel ratio is set to a stoichiometric ratio, and a lean-burn mode in which the air/fuel ratio is set to a lean-burn ratio;
- and
- a transmission that changes an input speed from the engine;
- the vehicle control system comprising:
- a controller that controls the engine and the transmission;
- wherein the controller is configured to
- determine a starting point of an inertia phase in which an input speed of the transmission is changed from a speed in a current gear stage toward a speed in the gear stage to be achieved after a shifting operation of the gear stage of the transmission, when the shifting operation is demanded during propelling the vehicle in the lean-burn mode,
- switch the operating mode of the engine from the lean-burn mode to the stoichiometric mode before the starting point of the inertia phase, and
- execute an ignition retard of the engine during propelling the vehicle in the stoichiometric mode.
Dependencies are inferred from the claim text.