Cold run automatic controller
of the cold run automatic controllers (KLR) is a construction unit, which reduces the pollutant output with an older passenger car with petrol engine and regulated catalyst after a cold weather starting. Since the emission test before the standard euro 2 contained still no cold weather starting, many vehicles were not yet optimized on a exhaust-poor start.
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mechanical monitoring system
if the engine, the catalyst and the Lambda probe yet their operating temperature did not reach, the exhaust gas not yet completely oxidized, it contain substantially more Carbon monoxide (CO) and hydrocarbons (C x H y) as for continuous operation is specified. An electromechanical cold run automatic controller (offered by twin Tec) supplies during the phase of the cold run valve-steered an additional air flow, which a Abmagerung fuel to the air intake system - air mixture and a better oxidation of the air pollutants causes. The amount of air becomes from the temperature of the cooling water, which engine computes number of revolutions and the load. Generally for this no interference is into the motor control necessary. If the cold run phase is terminated, thus the cooling water a certain temperature reached, switches the system off.
of the KLR is usually later built, in order to reach a classification into a better pollutant class, what with the Kfz tax can entail a clear saving. The tax saving is proportional to the capacity. Armament will reach 1 - standard made, in order the euro 2 or D3 - standard particularly with vehicles of the euro. Reason for the improvement of the pollutant class is reduced environmental impact in the cold run phase.
with less spread vehicle models with pollutant class euro 1, with those no cold run automatic controller or with vehicles with defective catalyst, is offered Upgrade is available and/or. Exchange catalysts on. This variant is however quite cost-intensive, since here the existing catalyst is exchanged against a technically improved copy. Against a KLR a Upgrade catalyst lowers the pollutant output again also after reaching the operating temperature. Since KLR do not function with diesel engined vehicles principle conditionally, only Upgrade Oxidationskatalysator are applicable to the classification into a better pollutant class. With large volume engines (in particular diesel engined vehicles) itself a catalyst change can, under which, however fast amortize tax saving.
Expandable electronic monitoring systems represent a further alternative. These systems (for example offered by HJS vehicle technology) increase directly after the start of the engine the idling speed easily by an additional electronic controller on. Thus the catalyst heats itself faster and reaches thus its operating temperature in former times. This again has the consequence that the pollutant output is substantially reduced by the Verkürzung of the cold run phase. Starting from a coolant temperature of approx. 35 °C the regulation is completely taken back by the electronic cold run automatic controller.
An overview of all possibilities makes the General German Automobile Association in the document “re-tooling systems available to the improvement of the pollutant classification” .
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- twin Tec (manufacturer)