SECONDARY-AIR SYSTEM AND METHOD FOR CHECKING THE OPERABILITY OF THE SECONDARY-AIR SYSTEM

摘要

A method for checking the operability of a secondary-air system of an internal combustion engine includes measuring a first pressure between a first secondary-air pump and a first master secondary-air valve as well as a second master secondary-air valve, measuring a second pressure between a second secondary-air pump and a first slave secondary-air valve and a second slave secondary-air valve, controlling the first master secondary-air valve and the first slave secondary-air valve together, and controlling the second master secondary-air valve and the second slave secondary-air valve together. A secondary-air system includes a first control and a second control, wherein a first master secondary-air valve and a first slave secondary-air valve are controllable together by the first control and wherein a second master secondary-air valve and a second slave secondary-air valve are controllable together by the second control.

主权项

1. A secondary-air system, comprising:
a plurality of exhaust gas banks including a first master exhaust gas bank, a second master exhaust gas bank, a first slave exhaust gas bank, and a second slave exhaust gas bank; a plurality of secondary-air pumps including a first secondary-air pump and a second secondary-air pump; a plurality of secondary-air lines including a first secondary-air line, a second secondary-air line, a third secondary-air line, and a fourth secondary-air line, wherein, by using said secondary-air pumps, secondary air is guidable, via said secondary-air lines, to said exhaust gas banks; a plurality of secondary-air valves including a first master secondary-air valve, a second master secondary-air valve, a first slave secondary-air valve, and a second slave secondary-air valve, wherein in each case a respective one of said secondary-air valves is assigned to a respective one of said secondary-air lines; said first master exhaust gas bank being connected, via said first secondary-air line, to said first master secondary-air valve; said second master exhaust gas bank being connected, via said second secondary-air line; to said second master secondary-air valve, wherein, by using said first secondary-air pump, said first and said second master secondary-air valve and associated ones of said secondary-air lines can be supplied with secondary air; said first slave exhaust gas bank being connected, via said third secondary-air line, to said first slave secondary-air valve, said second slave exhaust gas bank being connected, via said fourth secondary-air line, to said second slave secondary-air valve, wherein; by using said second secondary-air pump, said first and said second slave secondary-air valve and associated ones of said secondary-air lines can be supplied with secondary air; and a plurality of controls including a first control and a second control, wherein, by using said first control, said first master secondary-air valve and said first slave secondary-air valve are controllable together and wherein, by using said second control, said second master secondary-air valve and said second slave secondary-air valve are controllable together.