Power control method and system of hybrid electric vehicle

Abstract

The invention discloses a power control method and system of a hybrid electric vehicle. The power control method and system of the hybrid electric vehicle are applied to the hybrid electric vehicle which comprises an engine and an electric / generation all-in-one machine. The working condition parameters of the engine are obtained when the hybrid electric vehicle is in a running state; whether the engine runs in a low load condition or in a high load condition is judged according to the working condition parameters; the load of the engine in the high load condition is higher than that in the low load condition; and the working condition of the electric / generation all-in-one machine is adjusted if the engine runs in the low load condition to make the engine to run in the high load condition or make the engine stop working. By applying the power control method and system of the hybrid electric vehicle, the engine can be made to run in the high load condition or stop working through adjusting the working condition of the electric / generation all-in-one machine, the engine is avoided working in the low load condition, so that the temperature of exhaust gas can be increased, nitric oxide in exhaust gas can be fully decomposed by an exhaust gas aftertreatment system, and the exhaust gas pollution is decreased.

Description

technical field [0001] The present application relates to the field of power technology, and more particularly relates to a power control method and system for a hybrid electric vehicle. Background technique [0002] With the increasing shortage of non-renewable resources such as oil and people's increasing emphasis on environmental protection, more and more users will use hybrid vehicles as their primary choice for car purchases. [0003] The power system of a hybrid vehicle usually includes an engine and an electric / generator integrated machine. The electric / generator integrated machine is a motor with two working modes of a motor and a generator. The engine can drive the car alone, and can also drive the electric / generator integrated machine. For power battery charging, the electric / generator integrated machine can be used as a motor to drive the car alone, or it can be used as a generator to charge the power battery driven by the engine, so the hybrid car can take into a...

AI Technical Summary

Problems solved by technology

[0004] However, in the current hybrid electric vehicles, the engine can only passively output torque according to the needs of the whole vehicle, and cannot automatically adjust the output torque according to the actual operating state of the vehicle. When the exhaust temperature is low, the exhaust after-treatment system cannot fully decompose the nitrogen oxides in the exhaust, resulting in greater exhaust pollution, which is not conducive to environmental protection

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