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By a lean burn operation, a highly efficient operation region is enlarged, the proportion of engine operation in a low torque condition is increased, and the proportion of motor operation using a battery is decreased. It is possible to provide a hybrid car of an engine-electric motor configuration w

By a lean burn operation, a highly efficient operation region is enlarged, the proportion of engine operation in a low torque condition is increased, and the proportion of motor operation using a battery is decreased. It is possible to provide a hybrid car of an engine-electric motor configuration which can effect a highly efficient operation without increasing the capacity of motor and that of battery.

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What is claimed is: 1. A hybrid car comprising: an engine; a power distributing mechanism for distributing power of said engine; a torque assisting motor-generator disposed on an output shaft of said power distributing mechanism; a driving shaft connected to said torque assisting motor-generator; a

What is claimed is: 1. A hybrid car comprising: an engine; a power distributing mechanism for distributing power of said engine; a torque assisting motor-generator disposed on an output shaft of said power distributing mechanism; a driving shaft connected to said torque assisting motor-generator; a differential motor-generator connected to an input shaft of said power distributing mechanism; a battery connected to both said torque assisting motor-generator and said differential motor-generator through an inverter; and an engine controlling unit configured to provide delayed closing of the intake valve by varying valve timing of intake valves in the engine. 2. A hybrid car according to claim 1, wherein said engine is a cylinder-direct fuel injection engine. 3. A hybrid car comprising: a lean burn engine; a battery connected to a torque assisting motor-generator through an inverter; a lean NOx catalyst for reducing NOx in the exhaust gas from the lean burn engine in a lean burn combustion time; and a control unit to control an air/fuel ratio and to control a torque distribution between the lean burn engine and the torque assisting motor-generator; wherein, during a regeneration of said lean NOx catalyst, the torque assisting motor-generator is operative to control a torque thereof to lower a torque of the lean burn engine. 4. A hybrid car according to claim 3, wherein said lean NOx catalyst causes NOx component to be adsorbed thereon in a lean burn operation and causes it to be reduced in a rich burn operation. 5. A hybrid car according to claim 4, wherein the catalyst when deteriorated by being poisoned with SOx contained in fuel is regenerated by the rich burn operation. 6. A hybrid car according to claim 4, further including: an NOx adsorption estimating means; an SOx deterioration estimating means; and a regeneration control determining means; wherein the air/fuel ratio in regeneration control is set richer than a stoichiometric air/fuel ratio and, at the same time, engine torque is decreased and motor torque is controlled to maintain a substantially constant driving shaft torque. 7. A hybrid car according to claim 4, further including: a regeneration control determining means; wherein the air/fuel ratio in, regeneration control is set richer than a stoichiometric air/fuel ratio and, at the same time, engine torque is decreased and motor torque is controlled to maintain a substantially constant driving shaft torque. 8. A hybrid car according to claim 4, further including: an NOx adsorption estimating means; an SOx deterioration estimating means; and a regeneration control determining means; wherein, during outputting of torque from the engine during the lean burn operation, by regenerating said air/fuel ratio, under a condition where a torque of the engine supplied to a driving shaft of the car is lowered, said air/fuel ratio of the engine is made richer than the stoichiometric value, and with lowering of the torque of the engine, the torque of said motor-generator is increased, and the torque thereof is supplied to said driving shaft. 9. A hybrid car comprising: a lean burn engine; a battery connected to a torque assisting motor-generator through an inverter; a lean NOx catalyst for reducing NOx in the exhaust gas from the lean burn engine in a lean burn combustion time; and a control unit for controlling an air/fuel ratio and controlling a torque distribution between the lean burn engine and the torque assisting motor-generator; wherein during torque outputting from the lean burn engine by a richening of said air/fuel ratio of the lean burn engine, the torque assisting-motor-generator is controlled to lower a torque of the lean burn engine. 10. A hybrid car comprising: a lean burn engine; a battery connected to a torque assisting motor-generator through an inverter; a lean NOx catalyst for reducing NOx in the exhaust gas from the lean burn engine in a lean burn combustion time; and a control unit configured to control an air/fuel ratio of the lean burn engine and a torque distribution between the lean burn engine and the torque assisting motor-generator; wherein during torque outputting from the lean burn engine by regenerating of said air/fuel ratio, under a condition where a torque of the engine supplied to a driving shaft of the car is lowered, the air/fuel ratio, is enriched and with a lowering of the torque of the engine, the torque of said motor-generator is increased, and the torque thereof is supplied to said driving shaft. 11. A hybrid car comprising: a lean burn engine; a battery connected to a torque assisting motor-generator through an inverter; a lean NOx catalyst for reducing NOx in the exhaust gas from the lean burn engine in a lean burn combustion time; and a control unit for controlling an engine air/fuel ratio and controlling a torque distribution between the lean burn engine and the torque assisting motor-generator; wherein during torque outputting from the lean burn engine by regenerating said lean NOx catalyst, under a condition where a torque of the engine supplied to a driving shaft of the car is lowered, said engine air/fuel ratio of the engine is made richer than the stoichiometric value, and with lowering of the torque of the engine, the torque of said motor-generator is increased, and the torque thereof is supplied to said driving shaft.