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Method and system for modifying HC discharge of engine when starting

An engine and cold start technology, applied to engine components, combustion engines, machines/engines, etc., to achieve the effect of reducing emissions

Inactive Publication Date: 2008-07-02
CHERY AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method only considers working through the heater to increase the temperature of the three-way catalytic converter

Method used

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  • Method and system for modifying HC discharge of engine when starting

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Embodiment 1

[0013] Embodiment 1 A method for improving HC emission during cold start of an engine, the main steps are: 1. Take fresh air and inject it into the passage behind the exhaust valve of the engine; 2. When the exhaust valve is opened, the fresh air directly carries out oxidation reaction with the exhaust gas; 3. The exhaust gas enters the three-way catalytic converter for catalytic conversion. The specific solution is that the secondary air pump pumps fresh air from the air filter, passes through the secondary air valve (the ECU determines the amount of air injection), and then distributes the air to both ends of the cylinder head by a special structure and enters the exhaust manifold. The air groove on the pipe (the four-cylinder machine adopts the method of injecting two by two), and a hole is drilled at the same position on the cylinder head, which leads to the exhaust valve, the air groove on the exhaust manifold and the hole on the cylinder head The holes are directly conne...

Embodiment 2

[0014] Example 2 as figure 1 As shown, a system for improving HC emission when the engine is cold started, including a secondary air pump 4 that takes air from an air filter 2 and is connected to a secondary air valve 5 inlet controlled by a solenoid valve 6, an oxygen sensor 7, and a three-way catalyst 8 and an electronic control unit (ECU) 1; the pipeline behind the engine exhaust valve 9 is connected to the three-way catalytic converter 8; an oxygen sensor 7 is arranged in front of the three-way catalytic converter 8; the electronic control unit 1 is electrically connected to the solenoid valve 6 and the oxygen sensor 7 ; It is characterized in that: the outlet of the secondary air valve 5 is connected to the exhaust valve 9 of the engine.

[0015] The electromagnetic valve 6 is a vacuum valve, which takes vacuum by connecting the intake manifold pipeline. The electronic control unit 1 is also electrically connected to and controls the throttle body 3 on the intake pipelin...

Embodiment 3

[0016] Embodiment 3 A system for improving HC emission when the engine is cold started, the rear outlet of the secondary air valve 5 is connected to the exhaust valve 9 of the engine. This is done by milling an air slot in the exhaust manifold and drilling a hole in each exhaust port on the exhaust side of the cylinder head that communicates with the air slot on the exhaust manifold. Then the fresh air is pumped in by the secondary air pump 4, and the fresh air is evenly distributed into the exhaust air passage by the air groove on the exhaust manifold, and finally the purpose of directly injecting fresh air into the exhaust passage is realized. All the other, with embodiment 2.

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Abstract

Disclosed is a method of improving HC emission when an engine is cold-started. The method includes the following main steps: 1. fresh air is injected into a passage behind an exhaust valve of the engine; 2. when the exhaust valve is opened, the fresh air performs oxidation reaction directly with exhaust gas; 3. the exhaust gas enters a three-way catalytic converter for catalyzing and converting. A system realizing the method comprises an inlet of a secondary air valve which connects an electromagnetic valve control and a secondary air pump extracting air from an air filter, an oxygen sensor, the three-way catalytic converter and an electronic control unit; wherein the rear pipe of the exhaust valve of the engine is connected with the three-way catalytic converter, the oxygen sensor is arranged before the three-way catalytic converter, and the electronic control unit is connected with the electromagnetic valve and the oxygen sensor via electricity. The method is characterized in that the rear outlet of the secondary air valve is connected with the exhaust valve of the engine. Since the position where secondary air is injected into the exhaust gas is arranged directly behind the exhaust valve, the oxidation reaction utilizes the temperature of the exhaust gas to the greatest extent, emission of HC and Co is greatly reduced, and the catalytic converter is started as soon as possible, thereby resulting in that emission requirements of cold-started emission values can be achieved more easily.

Description

technical field [0001] The invention relates to an automobile engine combustion emission method and system, in particular to a method and system for improving HC emission when the engine is cold started. Background technique [0002] It is well known that secondary air is injected to improve engine cold start emissions. When the engine starts, because the engine temperature is not high, the NOx emission is relatively small, but the HC and CO are relatively high. At this time, by injecting fresh air into the exhaust gas, HC and CO are further oxidized to generate H 2 O and CO 2 , so as to reduce the emission value, and at the same time, the oxidation reaction generates heat, which accelerates the light-off of the three-way catalytic converter and makes it work faster, so as to meet higher emission regulations. At present, the method of injecting fresh secondary air into the inlet of the three-way catalytic converter is basically used to achieve the above-mentioned effects....

Claims

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Application Information

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IPC IPC(8): F01N3/30F01N3/32F01N9/00
CPCY02T10/47Y02T10/22Y02T10/40
Inventor 张建波甘云强王许华周剑明倪强
Owner CHERY AUTOMOBILE CO LTD
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