Drive force control system for hybrid vehicles
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKazuma Aoki, Tatsuya Imamura, Yasuhiro Oshiumi, Yukari Okamura
Life of this patent
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Abstract
A control system for hybrid vehicles to prevent a reduction in a brake force when an electrical input to a battery is restricted. A controller is configured to execute a regeneration control to deliver a regenerative torque resulting from operating second motor as a generator to the drive wheels, and an engine brake control to deliver a brake torque resulting from a power loss of an engine to the output member. The controller is further configured to select an HV-Lo mode when an input power allowed to accumulate in the battery is smaller than a threshold power.
Claims14
A drive force control system for a hybrid vehicle, comprising:
- an engine;
- a first rotary machine that serves not only as a motor but also as a generator;
- a transmission mechanism that distributes an output torque of the engine to the first rotary machine side and an output member side, wherein an operating mode can be selected from a first mode in which a ratio of the output torque of the engine delivered to the output member side to a torque of the engine is set to a first predetermined ratio, and a second mode in which a ratio of the output torque of the engine delivered to the output member side to a torque of the engine is set to a second predetermined ratio that is smaller than the first predetermined ratio;
- a battery;
- a second rotary machine that serves not only as a motor but also as a generator, and that is connected electrically to the first rotary machine;
- and
- a controller to control the transmission mechanism,
- wherein the controller is configured to
- execute a regeneration control to deliver a regenerative torque resulting from operating the second rotary machine as a generator to the drive wheels, and an engine brake control to deliver a brake torque resulting from a power loss of the engine to the output member,
- maintain a rotational speed of the engine to a predetermined speed during execution of the engine brake control by operating the first rotary machine as a motor or a generator, and
- restrict selection of the first mode when an input power allowed to accumulate in the battery is smaller than a threshold power.
Dependencies are inferred from the claim text.