Device and control method for shortening light-off time of three-way catalytic converter

Abstract

The invention discloses a device for shortening three-way catalytic converter light-off time. The device comprises an electrical energy storage unit, an ECU control unit, a turbine, a gas compressor, an intercooler, a three-way catalytic converter and an air inlet bypass pipe; one end of the air inlet bypass pipe is connected to a pipeline between the gas compressor and the intercooler, the other end of the air inlet bypass pipe is connected to a pipeline between the three-way catalytic converter and an exhaust pipe outlet valve. The control method comprises the steps that the three modes of keeping the exhaust gas temperature before the engine stops last time, directly introducing high-temperature compressed air into the three-way catalytic converter, and converting the compressed air into the electric energy through exhaust gas energy and heating the exhaust gas through the electric energy when cold starting is conducted are conducted simultaneously, and therefore the three-way catalytic converter reaches light-off temperature within a short time, and the purpose of improving vehicle cold starting emission is achieved.

Description

technical field [0001] The invention relates to the technical field of automobile aftertreatment, in particular to a device and a control strategy for shortening the light-off time of a three-way catalytic converter. Background technique [0002] In-machine purification technology plays a greater role in reducing exhaust pollution by improving the engine combustion process, but its effect is limited, and it has negative effects on the power and economy of the car to varying degrees. As the requirements for engine emissions become more and more stringent, it becomes more and more difficult to improve the working process of engines. Engines that can balance power, economy, and emission performance are becoming more and more complex, and the cost is also rising sharply. Therefore, all parts of the world have successively developed exhaust gas post-treatment purification technologies, and installed various purification devices in the exhaust system while not affecting or less af...

AI Technical Summary

Problems solved by technology

[0002] In-machine purification technology plays a greater role in reducing exhaust pollution by improving the combustion process of the engine, but its effect is limited, and it has negative effects on the power and economy of the car to varying degrees

As the requirements for engine emissions become more and more stringent, it becomes more and more difficult to improve the working process of the engine. Engines that can balance power, economy, and emission performance are becoming more and more complex, and the cost is also rising sharply.

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