US 4,291,594 AGranted

Method of vehicle engine control

AssigneeRegie Nationale des Usines Renault

InventorPatrice Baudoin

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Abstract

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.

Claims10

Dependent claims

A method of regulation of a motor-drive unit for a motor vehicle which comprises a heat-engine and a transmission having a continuously variable transmission ratio, said method comprising:

during steady operation (a) controlling the heat-engine fuel feed as a function of the two variables which consist of (i) the displacement of the accelerator pedal of the vehicle and (ii) the speed of rotation of the heat-engine, to cause the power delivered by the heat-engine to be as near as possible to the power required which corresponds with the displacement of the accelerator pedal, and (b) controlling the transmission ratio to cause the speed of rotation of the heat-engine to tend to approach an ideal speed which depends upon said required power and is predetermined for operation of the motor- drive unit, which is optimalised in accordance with a chosen criterion;
and
during transient operation (a) modifying the power delivered by the heat-engine as a function of the displacement of the accelerator pedal to be as near as possible to said required power, and (b) thereafter controlling the transmission ratio without changing the modified power so that said speed of rotation tends to approach said ideal speed.

Dependencies are inferred from the claim text.

Facts

Application: 05/891,995Filed 31 Mar 1978
Priority: FR 77 0979931 Mar 1977
Granted: 29 Sep 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification14 codes

B60W 10/06
Including control of propulsion units: including control of combustion engines
B60W 10/02
Conjoint control of vehicle sub-units of different type or different function: including control of driveline clutches
B60W 10/101
Including control of change-speed gearings: infinitely variable gearings
B60W 30/188
Propelling the vehicle: controlling power parameters of the driveline, e.g. determining the required power