Dynamic air compensation and heat management system of diesel engine

Abstract

The invention provides a diesel engine dynamic air compensation and heat management system which comprises a supercharger and an engine, an intercooler and a DACS valve are sequentially arranged on a pipeline between an air outlet of the supercharger and an air inlet of the engine, and air flowing out of the air outlet of the supercharger sequentially passes through the intercooler and the DACS valve to enter the air inlet of the engine; one end of the bypass air guide pipe is communicated with a pipeline between an air outlet of the supercharger and a port, close to the supercharger, of the intercooler; the other end of the bypass gas guide pipe is communicated with the DACS valve; a bypass throttle valve is arranged at a port, communicated with the DACS valve, of the bypass air guide pipe; a temperature sensor is arranged at an air inlet of the engine and used for detecting the air inlet temperature of the air inlet of the engine in real time. The system further comprises an engine controller and a DACS controller. Adjustment of the air inlet temperature of the engine is effectively achieved, so that the exhaust temperature is increased, and tail gas emission is improved.

Description

technical field [0001] The invention belongs to the technical field of engine air, and in particular relates to a dynamic air compensation and thermal management system for a diesel engine. Background technique [0002] When the engine is working, the turbocharging device is used to increase the engine output torque without increasing the engine displacement; the air intake intercooler is used to cool the high-temperature air after turbocharging to increase the intake charge; the air intake throttling is adopted The device reduces the intake flow of the engine and increases the exhaust temperature to ensure the normal operation of the exhaust after-treatment device. [0003] The turbocharged engine has insufficient boost pressure due to insufficient exhaust gas capacity at low speeds, which limits the increase in fuel injection volume, resulting in poor low-speed torque performance. [0004] The engine responds sluggishly at low RPMs due to aerodynamic lag in the turbocharg...

AI Technical Summary

Problems solved by technology

[0003] Turbocharged engine at low speed due to insufficient exhaust gas capacity leads to insufficient boost pressure, which limits the increase in fuel injection volume, resulting in poor torque performance at low speeds

[0004] Slow engine response at low rpm due to turbocharger aerodynamic lag

The intercooler will increase the resistance of the intake air, resulting in a decrease in the intake boost pressure of the engine, resulting in a decrease in engine performance; in light engine load conditions, the charge air cooling demand is low, and the intake air passes through the intercooler, resulting in heat loss, which will cause Engine exhaust temperature decreases, and too low exhaust temperature will reduce the conversion efficiency of the aftertreatment device, resulting in worsening emissions

[0005] The engine uses a throttle valve to control the intake air, and the intake air volume is reduced to increase the exhaust temperature under low-load conditions. Generally, it will increase the pumping loss and reduce the engine efficiency, resulting in worse fuel consumption

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