A kind of engine system and control method

Abstract

The invention relates to the field of automobile power, and discloses an engine system and a control method. The engine system includes an intake pipeline, an exhaust pipeline and an insulated gas storage tank. The insulated gas storage tank is provided with a first communication port, a second communication port and a third communication port, and the first communication port passes through the first connecting pipe. connected to the intake pipeline upstream of the compressor, the second communication port is connected to the exhaust pipeline between the turbine and the exhaust regulating valve through the second connection pipeline, and the third communication port is connected to the exhaust pipeline through the third connection pipeline. On the exhaust line between the gas regulating valve and the temperature sensor. The invention introduces the low-temperature exhaust gas in front of the three-way catalytic converter into the thermal insulation gas storage tank when the engine is cold started, and can be used as a low-pressure EGR while reducing emissions, reducing fuel consumption, and refilling the three-way catalytic converter stored before the last stop. The high-temperature, low-emission gas is exported to the three-way catalytic converter, the temperature of the three-way catalytic converter is increased, the light-off time is shortened, and the cold start emission is reduced.

Description

technical field [0001] The invention relates to the field of automobile power, in particular to an engine system and a control method. Background technique [0002] With the increasingly stringent emission regulations and fuel consumption regulations, energy saving and emission reduction has become the primary goal of today's engine development. When the engine is cold started, the body temperature is low, the oil and gas are not mixed uniformly, and the combustion cannot be completed, which leads to an increase in fuel consumption and HC emissions. Insufficient combustion also leads to low exhaust temperature, the three-way catalytic converter cannot quickly reach the light-off temperature, and the conversion efficiency is poor. Studies have shown that HC and CO emissions from the cold start stage account for 50%-80% of the emissions in the entire emission test process. [0003] In the prior art, in order to increase the exhaust gas temperature and the temperature of the ...

AI Technical Summary

Problems solved by technology

However, due to the high exhaust temperature, EGR cooling often faces problems such as insufficient cooling capacity or condensed water.

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