Combustion engine with quick arrangement for its exhaust gas cleaning device during cold or idle run

Claim 1

In a combustion engine, an exhaust gas cleaning arrangement operable at predetermined temperature and placed in the exhaust gas conduit of the engine, such predetermined temperature is attained by said exhaust gas cleaning arrangement through the heat of the exhaust gases, a device for adjusting the ignition timing and the fuel supply to the engine during a cold start thereof or during an idle running phase of operation thereof for delivering exhaust gases having an increased temperature for quickly heating up said cleaning arrangement, said device comprising a pair of switching means serially connected with respect to each other in a circuit, a pair of magnetically operated valve means connected parallel with respect to each and series with respect to said pair of switching means in said circuit, a suction pipe means for supplying fuel-air mixture to the engine, a valve means mounted in said suction pipe means for controlling the supply of the fuel and air mixture, a pipe conduit means comprising a branch of said suction pipe means and bypassing said control valve means, one of said magnetic valve means being coupled with said pipe-conduit for effecting opening or closing thereof, a low pressure conduit means connected to said suction pipe means, means for adjusting the ignition timing connected to said low pressure conduit means, the other of said magnetic valve means being coupled to said low pressure conduit means for effecting the opening or closing thereof, a thermostat means for sensing the temperature of said exhaust gas cleaning arrangement and connected there for operation to one of said switching means for effecting energization of said magnetic valve means, a camming means fixedly coupled with said control valve means for effecting the actuation of the other of said switching means, said magnetic valve means receiving energizing current when both of said switching means are actuated, whereby an enriched fuel-air mixture is supplied to the engine through said pipe-conduit means when it is opened by one of said magnetic valve means, and said ignition timing means is set ''''delayed'''' by said adjusting means in response to a pressure condition in said low pressure conduit when the other of said magnetic valve opens said conduit duRing the idle running operation of said engine.