Method for controlling engine torque when shifting gears
AssigneesRENAULT s.a.s., Automobiles Peugeot, Automobiles Citroen
InventorsChristian Taffin, Jean-Pierre Arbona
Life of this patent
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Abstract
The invention relates to a motor vehicle comprising a fully automatic transmission, of the type in which a management unit (20) controls the operation of the engine (10) as a function of torque demand information from a throttle pedal (24), and of the type in which the engine management can be modified as a function of information transmitted by a transmission (16) control unit (22) to the engine (10) management unit (20), characterized in that for certain phases of operation of the vehicle, the transmission (16) control unit (22) inhibits the action of the torque demand information, for which it substitutes an engine management command to which the management unit (20) is subordinated.
Claims18
A motor vehicle comprising:
- a fully automatic transmission having a transmission control unit;
- and
- an engine having an engine management unit, said engine management unit receives, from a throttle pedal, information representative of torque demand from a driver of the motor vehicle, on the basis of the information, the engine management unit controls operation of the engine,
- said engine management unit supplies information to the transmission control unit, management of said engine being modifiable as a function of information transmitted by the transmission control unit to the engine management unit,
- for certain phases of operation of the vehicle, the transmission control unit inhibits an action of the torque demand information and substitutes said torque demand information with an engine management command to which the engine management unit is subordinated,
- wherein when shifting from an old gear ratio to a new gear ratio which is progressively lower, the transmission control unit transmits to the engine management unit, a management command so that the engine follows a given speed variation curve.
A motor vehicle comprising:
- a fully automatic transmission;
- a transmission control unit for controlling said transmission;
- an engine connected to said transmission;
- an engine management unit for managing said engine;
- and
- a throttle pedal transmitting torque demand information from a user of the vehicle to the engine management unit,
- wherein the transmission control unit controls the transmission to follow a given speed variation curve and compares the torque demand information to a maximum torque value, so that there is at least two of a limit on engine torque as a function of design specifications of the transmission, the limit is removed when the user demonstrates a rapid increase in the demand for additional torque, and a duration for the additional torque is limited.
Dependencies are inferred from the claim text.