Method of limiting torque of an electric machine of a hybrid vehicle with a speed control system

Abstract

A method for a hybrid vehicle for limiting the torque drawn by a first electric machine (12) linked to a combustion engine (2) linked to a transmission (4), said first machine being designed to supply current to a battery (10) of the onboard network of the vehicle, and an energy storage device (16) which delivers said energy to a second traction electric machine (20), the vehicle comprising an automatic system for controlling the speed of same, characterised in that, in case the combustion engine (2) is not able, on a given ratio of the transmission (4), in response to a request from the automatic speed control system, to deliver the preferred acceleration, it sheds the load of the energy storage device (16) or of the battery (10) of the onboard network before using the second electric machine, or changing the ratio, if this load shedding alone is not sufficient to provide the preferred acceleration.

Description

technical field [0001] The invention relates to a hybrid vehicle having a traction heat engine and an electric machine coupled to the heat engine, the electric machine capable of charging an electrical energy storage device, a method of limiting the torque driving the electric machine, and the implementation of the method of hybrid vehicles. Background technique [0002] One class of known hybrid vehicles has a traction heat engine, which may be of gasoline or diesel type, driving the front wheels through a transmission comprising different ratios, coupled in a permanent manner to a front electric motor which can act It acts on the engine to start the heat engine, and on the generator to charge the battery and electrical energy storage of the on-board network. [0003] The energy storage device supplies power to a second rear electric motor that drives the rear wheels, which can also act on the engine to transmit torque at these wheels, or on a generator to recover vehicle ...

AI Technical Summary

Problems solved by technology

[0009] To this end, the invention proposes a method for limiting the torque of a hybrid vehicle, said torque being taken up by a first electric machine coupled to a drive mechanism (4) that drives the vehicle through transmissions (4) comprising different speed ratios A traction heat engine with a first electrical machine arranged to supply current to a low voltage battery of an on-board network of a vehicle including an automatic control system for its speed to regulate or limit speed , characterized in that the method of limiting torque reduces or sheds energy storage in the event that the heat engine is unable to deliver an acceleration of the vehicle sufficient to correspond to the level of comfort in response to the requirements of the automatic speed control system based on the same speed ratio of the transmission The load of the low-voltage battery of the device or the vehicle network

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