Abstract: The invention is directed to a method for limiting the temperature of the exhaust gas of an internal combustion engine operating at high load. In the method, a first measure for reducing the exhaust-gas temperature is carried out when the engine is operating under high load. Then, a check is made as to whether this measure is effective. If the first measure is inadequately effective, then a second measure is carried out to reduce the exhaust-gas temperature.

Abstract: The invention is directed to a method for adjusting a supplemental quantity of fuel which is supplied to an internal combustion engine during warm-up operation in addition to a basic quantity measured for an operationally warm engine. The method includes the step of basing the adaptation of the supplemental quantity of fuel on an evaluation of the control actuating variable of an idle speed control.

Abstract: Data is transmitted asynchronously between a master and a slave microprocessor unit by first converting the number representing the word or part thereof to be transmitted into a time interval, transmitting a pulse having a width corresponding to the time interval and, at the receiver, reconverting the pulse width (time interval) to a number. Conversion and reconversion can be accomplished by, respectively, down counting a counter with a fixed frequency from the number constituting the word to be transmitted and up-counting a counter during the received pulse width at the same frequency.