Internal combustion engine gas exhaust and temperature exhaust management system and control method

Abstract

The invention belongs to the technical field of vehicle engines, and particularly relates to an internal combustion engine gas exhaust and temperature exhaust management system and a control method. The internal combustion engine gas exhaust and temperature exhaust management system comprises an internal combustion engine, an air filter, an inlet gas intercooler and an aftertreatment system. Whenengine exhaust gas recirculation (EGR) is introduced into management, according to different engine load requirements, by controlling the open degree of a second exhaust managing valve and a first exhaust managing valve which are integrated on a first runner and a second runner respectively as well as the combined effect of a low-temperature EGR one-way valve, the backpressure of the engine is improved, then EGR is driven to enter a gas inlet system, the introduction proportion of EGR can be controlled flexibly, and the control requirement that the exhaust recirculation proportion in a cylinder is 0-100% can be achieved. The system and the control method can also be used for engine exhaust temperature management and can assist in engine braking.

Description

technical field [0001] The invention belongs to the technical field of automobile engines, and in particular relates to an exhaust and exhaust temperature management system and control method of an internal combustion engine. Background technique [0002] Facing the upgrading of commercial vehicle emission regulations, the emission requirements are becoming more and more stringent. The development trend of emission regulations is to meet the emission requirements in the entire map area of ​​the engine, and exhaust gas recirculation (EGR) technology has become the most effective means of emission control. EGR technology has gradually become The mainstream technical route, but the introduction of EGR needs to be matched with a small supercharging scheme, so that the engine can meet the EGR demand at medium and high speeds, but it will cause an increase in pumping loss, resulting in deterioration of engine economy. At the same time, it is more difficult to introduce EGR at low s...

AI Technical Summary

Problems solved by technology

[0004] In order to meet the rapid temperature rise of engine exhaust, the current existing technology adopts throttle valve, exhaust back pressure valve, cylinder post-injection and other solutions, but its disadvantages are: ①Limited heating capacity, ②Throttle valve, exhaust back pressure valve may Causes the risk of turbocharger oil leakage, ③ economical deterioration is obvious, ④ the uniformity of intake combustion of each cylinder is poor, the emission consistency and NVH performance are poor

[0005] A method for treating exhaust gas and an exhaust system mechanism on an internal combustion engine are disclosed in the existing patent literature. The disadvantages of this structure are: ① limited by the structure, it can only achieve the requirement of controlling the exhaust gas recirculation of 0-50%, ②At the same time, due to the single-channel closure, the one-sided back pressure is too large, which causes the cylinders of the engine to be charged differently. The unbalanced working medium in the cylinder is not good for emission control. At the same time, the explosion pressure in the cylinder will be different, which will cause NVH problems. It is necessary to combine the fuel supply system with an asymmetric fuel injection strategy to manage engine exhaust temperature

[0006] A cylinder deactivation and engine braking method for thermal management is disclosed in the existing patent literature, and its disadvantages are: ① Its structure realizes cylinder deactivation and engine braking through the engine exhaust mechanism, and its valve mechanism has a large mechanical load , poor reliability, ②The cylinder valve opens under high pressure, and its noise level is relatively high

[0007] A kind of engine exhaust temperature raising device is disclosed in existing patent document, and its shortcoming is: 1. It divides cylinder into groups, increases air intake throttle valve to make a group of cylinders intake air, but it will cause surge and leakage to supercharger; Oil risk; ②Adjust the fuel volume of the cylinder and increase the fuel injection volume of other grouped cylinders, the uniformity of each cylinder is poor, and there is a large NVH problem

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