Control device for hybrid vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroki MORITA, Yoshihito KANNO, Gohki KINOSHITA
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Abstract
A control device according to the invention moves an operation point of an internal combustion engine such that a distribution of engine torque with respect to required torque is reduced and then carries out air-fuel ratio control for reducing an air-fuel ratio of the internal combustion engine in a case where an operation mode of the internal combustion engine should be switched from a lean combustion mode to a stoichiometric combustion mode.
Claims5
A control device for a hybrid vehicle applied to a hybrid vehicle including an internal combustion engine and at least one motor generator as power sources for traveling, the internal combustion engine capable of switching operation modes between a lean combustion mode and a non-lean combustion mode set to an air-fuel ratio on a rich side in comparison to the lean combustion mode, the control device comprising:
- torque control unit capable of changing a distribution of engine torque of the internal combustion engine and motor torque of the motor generator with respect to required torque;
- and
- air-fuel ratio control unit configured to carry out air-fuel ratio switching control for reducing the air-fuel ratio of the internal combustion engine in a case where the operation mode is switched from the lean combustion mode to the non-lean combustion mode,
- wherein the air-fuel ratio control unit carries out the air-fuel ratio switching control after the torque control unit reduces the distribution of the engine torque with respect to the required torque in a case where the operation mode should be switched from the lean combustion mode to the non-lean combustion mode,
- wherein the torque control unit reduces the distribution of the engine torque with respect to the required torque by calculating the engine torque based on a first target air-fuel ration in the lean combustion mode, a second target air-fuel ration in the non-lean combustion mode, the required torque, and regeneratable torque regeneratable in the motor generator.
A control device for a hybrid vehicle applied to a hybrid vehicle including an internal combustion engine and at least one motor generator as power sources for traveling, the internal combustion engine capable of carrying out a lean combustion mode and capable of carrying out a rich spike for temporarily changing an air-fuel ratio into an air-fuel ratio on a rich side when the lean combustion mode is carried out, the control device comprising:
- torque control unit capable of changing a distribution of engine torque of the internal combustion engine and motor torque of the motor generator with respect to required torque;
- and
- air-fuel ratio control unit configured to carry out air-fuel ratio switching control for reducing the air-fuel ratio of the internal combustion engine in a case where the rich spike is carried out,
- wherein the air-fuel ratio control unit carries out the air-fuel ratio switching control after the torque control unit reduces the distribution of the engine torque with respect to the required torque in a case where the rich spike should be carried out,
- wherein the torque control unit reduces the distribution of the engine torque with respect to the required torque by calculating the engine torque based on a first target air-fuel ratio in the lean combustion mode, a second target air-fuel ratio during the rich spike, the required torque, and regeneratable torque regeneratable in the motor generator.
3-4. (canceled)
Dependencies are inferred from the claim text.