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In a process and apparatus for braking a hybrid drive vehicle, kinetic vehicular energy is converted by the driving electric motor into electrical power, which alternatively can be absorbed by charging a traction battery or by driving a combustion engine via a generator coupled to the engine, which

In a process and apparatus for braking a hybrid drive vehicle, kinetic vehicular energy is converted by the driving electric motor into electrical power, which alternatively can be absorbed by charging a traction battery or by driving a combustion engine via a generator coupled to the engine, which is functioning as a motor. According to the invention, engine braking is activated if the traction battery is fully charged, if its temperature lies outside a predetermined charging temperature range, or if the charging current due to the electrical power supplied by the driving electric motor exceeds a predetermined limit value.

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[ What is claimed is:] [1.] A process for braking a hybrid drive motor vehicle having a combustion engine, a generator mechanically coupled with the engine, and a driving electric motor electrically coupled to the generator and to a traction battery, wherein during a braking procedure, the driving e

[ What is claimed is:] [1.] A process for braking a hybrid drive motor vehicle having a combustion engine, a generator mechanically coupled with the engine, and a driving electric motor electrically coupled to the generator and to a traction battery, wherein during a braking procedure, the driving electric motor, in generator operation, converts kinetic energy into electric energy, which is alternatively absorbed by charging the traction battery or by driving the combustion engine, said process comprising the steps of:monitoring the charge state, temperature and charging current of the traction battery; andactivating engine braking upon the occurrence of at least one of the following:the traction battery is fully charged;the temperature of the traction battery lies outside a predetermined charging temperature range; andthe charging current intensity for the traction battery, due to the electric power supplied by the driving electric motor, exceeds a predetermined limit value.