Control Method for Reducing Emissions of Hybrid Electric Vehicles

Abstract

The invention discloses a control method for lowering the emission of a hybrid electric vehicle. An overall vehicle controller (1) is electrically connected with the heating module of an electric heating type three-way catalytic converter (5) mounted on an exhaust pipe (4). The control method includes: the overall vehicle controller judges whether a first heating activation condition and a secondheating activation condition are satisfied or not, and if both the first heating activation condition and the second heating activation condition are satisfied, the overall vehicle controller controlsthe electric heating type three-way catalytic converter to perform heating; the overall vehicle controller judges whether the temperature of the electric heating type three-way catalytic converter rises a temperature threshold allowing an internal combustion engine (2) to start or not, and if so, the overall vehicle controller requests the starting of the internal combustion engine; if not, the overall vehicle controller controls the electric heating type three-way catalytic converter to keep heating and does not request the starting of the internal combustion engine. By the method, low-voltage storage battery feeding caused by electric heating type three-way catalytic converter heating is avoided, and the cold starting emission of the internal combustion engine is lowered.

Description

technical field [0001] The invention relates to a method for controlling vehicle emissions, in particular to a control method for reducing emissions of hybrid vehicles. Background technique [0002] As the fuel consumption requirements of vehicles are getting higher and higher, traditional internal combustion engines have gradually been unable to meet the fuel consumption requirements. Therefore, hybrid vehicles driven by internal combustion engines and electric motors are becoming more and more popular. [0003] In hybrid vehicles, there is usually a vehicle controller or vehicle control unit. The unit can request the internal combustion engine to start or request the internal combustion engine to stop, taking into account the current environmental conditions, the driver's driving intentions and many factors such as the battery level. At the same time, the vehicle controller or the vehicle control unit will also distribute the corresponding torque between the internal comb...

AI Technical Summary

Problems solved by technology

[0008] Based on the above reasons, and taking into account other factors such as cost, the application of active electric heating three-way catalytic converters in traditional internal combustion engines is not very common at present.

Images