Process and apparatus for braking a hybrid-drive motor vehicle
First Claim
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; and
activating 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; and
the charging current intensity for the traction battery, due to the electric power supplied by the driving electric motor, exceeds a predetermined limit value.
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Accused Products
Abstract
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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Citations
6 Claims
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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:
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monitoring the charge state, temperature and charging current of the traction battery; and activating 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; and the charging current intensity for the traction battery, due to the electric power supplied by the driving electric motor, exceeds a predetermined limit value. - View Dependent Claims (2, 3, 4)
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5. An apparatus 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 the driving electric motor carries out a drive function for the engine, and the engine is designed to carry out an engine braking function, said apparatus comprising:
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a brake pedal sensor for detecting position of a brake pedal of said vehicle; a traction battery monitoring unit which monitors an operating state of the traction battery; and a hybrid drive control unit coupled to receive output signals from said brake pedal sensor, a slip control system and said traction battery monitoring unit, said output signals from said traction battery monitoring unit including information concerning at least one charge state, temperature, and charging current of said traction battery; said hybrid drive control unit including means for triggering at least one of battery charging braking and engine braking in response to a signal from said brake pedal signal, and for triggering engine braking upon the occurrence of at least one of the following; the recorded battery charge state has exceeded a predetermined full charge limit value; the battery temperature lies outside a predetermined charging temperature range; and the recorded charging current exceeds a predetermined charging current limit value. - View Dependent Claims (6)
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Specification