108results about How to "Reduce shift shock" patented technology

A twin clutch speed-change apparatus that can reduce shift shock includes a transmission with multiple gear pairs disposed between a main shaft and a countershaft. A twin clutch is provided on the main shaft, a rotational drive force from an engine being connected / disconnected between the transmission and the engine, a dog clutch is provided between an axially slidably attached slidable gear and an axially non-slidably attached non-slidable gear to select a gear pair, for transmitting a rotational drive force, from the multiple gear pairs. Dog teeth of the dog clutch include steps different in axial height from each other between a portion abutted against a lateral wall surface of a dog hole when the rotational drive force is transmitted by the dog clutch, and a portion abutted against a lateral wall surface of the dog hole when the rotational drive force is not transmitted by the dog clutch.

The invention relates to a hybrid drive system (2) for a motor vehicle (1), comprising an internal combustion engine (7) and an electric motor (16) which respectively drives the wheels (6) of the motor vehicle (1). Said internal combustion engine (7) is coupled to the corresponding wheels (6) by means of a first multi-speed gearbox (14). Said electric motor (16) is coupled to the corresponding wheels (6) by means of a second multi-speed gearbox (19).

An automatic gearbox of synchronizer-free and gearshift without power interruption type is prepared for applying two-shaft mode with five-gear variable speed, adding double-surface gearshift clutch, fixing fixed plate of gearshift clutch on a shaft of gearbox and arranging two float plates at two sides of said fixed plate.

Provided is a shift control device for a vehicle, constructed so as to reduce shift shocks in clutch-to-clutch shifting. With a transmission, for which multiple gear ranges are set in accordance with the engagement and release states of multiple engagement mechanism capable of continuously changing the torque capacity, being connected to the output side of a power supply, this shift control device for a vehicle performs clutch-to-clutch shifting that switches from a prescribed gear range to another gear range by gradually reducing the torque capacity of a prescribed engagement mechanism so as to release the prescribed engagement mechanism and gradually increasing the torque capacity of another engagement mechanism so as to engage this other engagement mechanism. In addition, this shift control device for a vehicle is equipped with: an output shaft torque calculation means (step S7) that calculates a target value for the output shaft torque of the transmission on the basis of the input shaft torque for the transmission, which is based on a driving amount requested by the driver, the angular acceleration of the input shaft of the transmission, the angular acceleration of the output shaft of the transmission, and the torque shares of the engagement-side engagement mechanism and the release-side engagement mechanism; and a torque capacity calculation means (step S8) that calculates the torque capacities for the engagement-side engagement mechanism and the release-side engagement mechanism in the torque phase and the inertia phase during clutch-to-clutch shifting, on the basis of the target value for the output shaft torque, the angular acceleration of the input shaft of the transmission, the angular acceleration of the output shaft of the transmission, and the torque shares of the engagement-side engagement mechanism and the release-side engagement mechanism.

In a downshift of an automatic transmission in a state where an accelerator pedal is depressed, one of a clutch-to-clutch shift in which the shift is carried out by gradually reducing an engagement pressure of a clutch or a brake to be disengaged in the shift and a rotation synchronization shift in which the shift is carried out by reducing the engagement pressure of the clutch or the brake more quickly than in the clutch-to-clutch shift is selected based on an output shaft torque of the automatic transmission, a region where the rotation synchronization shift is selected is lower in output shaft torque than a region where the clutch-to-clutch shift is selected, and hence it is possible to appropriately selectively execute a shift placing emphasis on a shock and a shift placing emphasis on a shift speed in accordance with the output shaft torque.