A secondary airinjection pump is a device for emission control which is used to heat the catalytic converter to ensure that there are optimal temperatures for performance. They are used to reduce the emission of harmful substances in to the environment. A petrol engine will require an adequate rich mixture of air to ensure that it properly starts. This will mean that the fuel will mix with air mixture. When this happens, there will be high levels of unburned hydrocarbons as well as carbon monoxide which will produced during the starting. As the sensor for oxygen emission as well as the catalytic converter have not yet reached the optimum temperatures for their operation, these dangerous components can find their way to the environment. For the purposes of ensuring that this doesn't happen during his process of cold starting, ambient air which contains high levels of oxygen is injected into the exhaust manifold and directed to the exhaust valves by the use of secondary air system. This will result in post oxidation of the harmful substances and create water together with carbon dioxide. The heat that will be generated in this process will heat the catalytic converter thus reducing the required period of time for the oxygen sensor emissions regulator to start its operations. The systems of secondary air injection or tundra air injection pump will comprise of secondary air valve as well as air pump.
Secondary air valves are placed between the exhaust gas manifold and the secondary air pump. Secondary air valves are available in a number of designs. For instance, the secondary air return valve will stop exhaust gas, pressure peaks or condensation in the exhaust tract which will damage the secondary air injection pump. The valve for the secondary air shut off will make sure that the secondary air is only supplied to exhaust gas exhaust in the process of cold start.
Secondary air valves are operate in a number of way, either through negative pressure which is regulated by an electric hangover or by an opening caused by pressure that is generated by the air pump. They have shorter closing and opening time than the pneumatically regulated valves. There are pressure sensors fitted which will detect any kind of problem which arises. This systems happened sot be the most essential in the process of reducing the high levels of unburnt hydrocarbons as well as carbon monoxide in cold starting. This will help to reduce environmental degradation by these gases. Learn more here!
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