Device for control of processes that depend on engine temperature in an automotive internal combustion powerplant

Claim 1

An exhaust system for an automotive internal combustion powerplant comprising; an inner pipe and an outer pipe longitudinally displaceable relative to each other, which pipes are parts of a thermal reactor and are thrust one into the other upon heating, a control means having two parts, one part being a segment of the inner pipe and the other part being attached to the outer pipe, the control means defining a throttling zone for the exhaust gases passing through the inner pipe, the crosssection of the throttling zone enlarging with rising temperature and consequent relative displacement of the pipes, a by-pass line provided with a catalytic afterburning means and connected to the outer pipe and in communication with the inner pipe ahead of the throttling zone in the direction of exhaust gas flow by way of orifices in the wall of the inner pipe, said orifices being increasingly throttled down with rising temperature of the inner pipe and consequent movement thereof relative to the by-pass line.