Exhaust system for car, has urea injection device comprising valve, and control unit for determining opening of valve in aspiration mode and controlling closing of injector to avoid any gas aspiration coming from processor
摘要
<p>The system has a urea injection device comprising a valve (28), which is arranged in a supply line (22) and upstream in the vicinity of an injector (24). A control unit determines closing of the valve in first and second modes and opening of the valve in a third mode of aspiration to allow fast aspiration of outdoor air and residual urea contained in the supply line of a power supply by a pump. The control unit controls closing of the injector to avoid any gas aspiration coming from a processor (14).</p>
