Regie Nationale Des Usines Renault

Patrice Baudoin

Daniel Houley

Control device of a continuous transmission associated with a heat engine and with a reversing converter whose turbine shaft is either made solid with the shaft of the reactor to obtain forward, or made solid with the housing to obtain reverse, characterized in that said control device generates an input speed set point of the variable speed drive (12) for reverse, which is different from the input speed set point of the variable speed drive for forward; so as to obtain, during the sliding time of the converter in reverse, a transmission ratio of the variable speed drive (12) which is lengthened and becomes longer than the one of forward.

Control device of a continuous transmission

A power transmission device for starting in forward or reverse, particularly for a motor vehicle having a heat engine, characterized in that it comprises a simple three-pinion planetary gear train associated with a clutch and brake to give reduced energy dissipation during starting in reverse.

Power transmission device for starting in forward or reverse

In the regulation of a motor-drive unit for a motor vehicle having a heat-engine and a continuously variable ratio transmission, in a clutch-engaged phase the heat-engine fuel feed is controlled so that it is a function of the displacement of the accelerator pedal of the vehicle and of the speed of the heat-engine such that the power delivered by the engine is substantially equal to the power required for that displacement of the accelerator pedal. In addition, the transmission ratio is controlled so that the speed of the heat-engine approaches an ideal speed which depends upon the power required and is predetermined for operation of the motor-drive unit which is optimalized in accordance with a chosen criterion. Operation is thus obtained with, for example, minimum consumption or pollution while taking into account, in the transient phase, the operation desired by the driver.

Vehicle engine control

Method of vehicle engine control

A hybrid transmission system for use in internal combustion engine vehicles provides two modes of vehicle operation. In the first or city mode, the vehicle is propelled by one or more reversible hydraulic motor/pumps which operate as a function of vehicle accelerator pedal displacement and of brake pedal displacement and which are driven by fluid pressure stored in an accumulator. In the second or highway mode, the vehicle is propelled by its internal combustion engine through a mechanical transmission. During the city mode operation, the accumulator is automatically and intermittently charged by a reversible hydraulic motor/pump driven by the internal combustion engine. Also, during the city mode, the internal combustion engine operates only during intermittent charging of the accumulator. The hybrid transmission system has automatic regulating units to control the accumulator charging process, to regulate the brake fluid pressure within the master brake cylinder to insure that vehicle braking is solely a function of brake pedal displacement, and to control which reversible hydraulic motor/pump(s) is (are) utilized during the city mode operation. Additionally, the hybrid transmission system utilizes a manually operated mode/selection device to allow the vehicle operator the choice of first or second mode vehicle operation.

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Bougival, France

Patrice Baudoin