36results about How to "Suppresses deterioration of drivability" patented technology

When any one of a plurality of variable valve characteristic mechanisms which vary different operating characteristics of an intake valve is failed, a limit which is capable of satisfying predetermined conditions for a change in opening timing of the intake valve at the time when the other operating characteristic is varied by the normally operating variable valve characteristic mechanism, is set and the operating characteristics of the intake valve are controlled while limiting the intake valve opening timing by the limit, by the normally operating variable valve characteristic mechanism.

This invention relates to a shift control device for an automatic transmission, which prevents deterioration of drivability by improving shift allowance. The shift control device comprises: a thermal load prediction unit which predicts a thermal load state of a friction element upon completion of a shift from a current thermal load state of the friction element; and a shift control unit which, when the thermal load state upon shift completion predicted by the thermal load prediction unit corresponds to a predetermined state, either performs the shift in a modified shift mode in which a heat generation amount of the friction element is smaller than the heat generation amount of the friction element when the predetermined state is not established, or prohibits the shift. The predetermined state is set at a different state in a case where the shift is an upshift and in a case where the shift is a downshift, and is set on the basis of a gradient of a traveling road.

A control device for a hybrid vehicle, which can inhibit damage to an exhaust purification catalyst and also suppress deterioration of drivability, is provided. The control device exercises catalyst protective control, which inhibits operation of an engine and drives a traction motor, if a state where an exhaust air-fuel ratio detected by an exhaust air-fuel ratio detection unit is lean continues for a first predetermined time or longer.

A shift control device is configured to control switching between shift stages in a multi-stage automatic transmission such that a gear ratio selected at a predetermined vehicle speed and selected in a regenerative traveling mode that is a boundary region with respect to an EV traveling mode becomes greater than a gear ratio selected at the predetermined vehicle speed and selected in an HV traveling mode that is a boundary region with respect to the EV traveling mode, and is configured to control the switching between the shift stages such that a gear ratio of a shift stage selected when the traveling mode is switched from the regenerative traveling mode to the EV traveling mode is greater than a gear ratio of a shift stage selected when the traveling mode is switched from the HV traveling mode to the EV traveling mode under the same vehicle speed and parameter.

When there is a request for a skip downshift that transitionally establishes an intermediate speed position, a surge hydraulic pressure at the start of a torque phase during shift control toward the intermediate speed position is set so as to be lower than a surge hydraulic pressure at the start of a torque phase during shift control toward a required speed position.

The invention provides a control device for an engine. While the vehicle is running, the catalyst device is warmed up early by appropriately executing the catalyst early warm-up control while suppressing deterioration of drivability or the like. The PCM (60), which is a control device for the engine, executes the catalyst advance warm-up control (AWS control) as follows when the catalyst device (35) is in an inactive state when the vehicle is running. Fuel injection control for injecting fuel in such a way that a homogeneous air-fuel mixture is formed in the combustion chamber (11) to make it burn homogeneously, and to control the amount of intake air to increase the amount of intake air, and to control the ignition time compared with the reference ignition time. Hysteresis ignition control preheats the catalyst device in advance. In addition, the PCM (60) changes the ignition timing retardation amount by which the ignition timing is retarded from the reference ignition timing by the ignition control according to the engine speed and / or the engine load.

An electric vehicle includes: a synchronous motor; an induction motor; and a control unit configured to adjust a torque from the synchronous motor and a torque from the induction motor, wherein the control unit includes a torque varying device configured to reduce an output torque from the synchronous motor while maintaining a total drive force of the electric vehicle, and increasing an output torque from the induction motor in the case where the electric vehicle is stopped in a state in which a torque is output from the synchronous motor. Accordingly, there is provided an electric vehicle capable of restraining deterioration of drivability and performing thermal protection of a motor and a control unit.