| 摘要 |
PCT No. PCT/DE87/00400 Sec. 371 Date Apr. 6, 1988 Sec. 102(e) Date Apr. 6, 1988 PCT Filed Sep. 3, 1987 PCT Pub. No. WO88/02069 PCT Pub. Date Mar. 24, 1988.The invention refers to a device for adapting the fuel/air metering system and the ignition system of an internal combustion engine to enable the engine to be operated with all normally available grades of petrol (gasoline). The invention provides for a manual facility for switching-over the fuel/air metering system from a fuel/air map for lambda =1 (operation with three-way catalytic converter and lambda sensor) with unleaded fuel to a fuel/air map for lambda NOTEQUAL 1. Additionally, a manual facility is provided for switching over or selecting two out of a total of four ignition timing maps for premium grade unleaded fuel (su), regular grade unleaded (nu), premium grade leaded (sb) and regular grade leaded (nb) (switch contacts 4, 10 11). An automatic switch-over function between the ignition timing maps su/nu and sb/nb is provided by means of a second automatic switch unit (14) operating in accordance with a threshold value 18 of an operating parameter of the combustion engine. The threshold value is preferably taken from a knock control system, giving the knock frequency or knock intensity.
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