Gearshift method and device for a hybrid electric vehicle

Abstract

The embodiment of the invention discloses a gear shifting method and device of a hybrid electric vehicle. The method includes the steps that an up-shifting command input by a user is obtained; the current state of charge of a battery is obtained; the threshold value range of the current state of charge of the battery is judged; and according to the threshold value range of the current state of charge of the battery, the gear shifting speed of a target gear is adjusted, wherein the threshold value comprises at least one of a standard state of charge range, a high state of charge range and a lowstate of charge range. According to the technical scheme, through adjustment of the gear shifting speed of the target gear, in other words, gear shifting is delayed or conducted in advance, the stand-by power of an engine is fully used for charging the vehicle in a hybrid power mode, motor drive is used for conducting discharging control on the battery in a pure electric mode, the state of chargeof the battery is adjusted, and therefore the state of charge of the battery is balanced.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a gear shifting method and device for a hybrid electric vehicle. Background technique [0002] As the international community pays more and more attention to energy security and environmental protection issues, countries have increasingly stringent requirements on vehicle emissions. Reducing dependence on energy and realizing energy conservation and emission reduction has become an urgent problem to be solved for the sustainable development of the world economy. Therefore, hybrid electric vehicles have become the development trend of today's automobile industry. [0003] From the perspective of the battery, overcharging (the SOC of the battery state of charge is too high) and excessive discharging (the SOC is too low) will affect the life of the battery, which is determined by the characteristics of the battery. Therefore, it is necessary to control the SOC of the battery w...

AI Technical Summary

Problems solved by technology

If the energy of the battery is used too much, the battery is often in a state of too low SOC when the vehicle is running, and it will enter power generation during driving, which will affect the power and comfort. Users feel that the performance of the vehicle is extremely unstable, causing users to complain; if the battery power is used too little, the battery is always in a state of too high SOC during driving, resulting in unreasonable energy distribution

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