METHOD AND ARRANGEMENT FOR CHECKING THE OPERATIONAL CAPABILITY OF AN EXHAUST-GAS PROBE HEATER AND THE SUPPLY SYSTEM THEREOF

摘要

PCT No. PCT/DE90/00569 Sec. 371 Date Apr. 30, 1991 Sec. 102(e) Date Apr. 30, 1991 PCT Filed Jul. 26, 1990 PCT Pub. No. WO91/03636 PCT Pub. Date Mar. 21, 1991.A method and an arrangement for carrying out the method are proposed whose fundamental concept is to perform a diagnosis of the heating device of an exhaust-gas probe, which emits a control signal for closed-loop controlling the air/fuel mixture of an internal combustion engine. The diagnosis is based on that the exhaust-gas probe is heated more rapidly because of the switching-in of the heating device than by mere heating by the exhaust gases which flow past the exhaust-gas probe. The heating device includes at least the probe heater, devices which supply the probe heater with the necessary heating power, and the supply leads therefor.