Method and device for electronically controlled fuel injection to internal combustion engine

Abstract

Abstract PURPOSE:To easily attain a point of compatibility of the temperature of exhaust gas and the output of an engine, the injected fuel quantity of which is compensated depending on the engine condition etc., by setting the maximum value of the injected fuel quantity as a function of the rotational frequency of the engine and the temperature of its cooling water. CONSTITUTION:In the normal operation of an engine, an electronic control circuit 38 calculates a basic injection time Tp from the outputs of an air flow meter 12 and a distributor 14 and compensates the time Tp on the basis of the signals of sensors 16, 22 etc. to determine an effective synchronous injection time gammal. When the temperature of cooling water has exceeded 70 deg.C, the control circuit 38 reads out a table value gammamax stored in a read-only memory 56, on the basis of the output of the cooling water temperature sensor 16. When the effective synchronous injection time gammal is longer than the table value gammamax, the table value is used as the effective synchronous injection time. When the effective synchronous injection time gammal is longer than the upper limit gammau of the table value gammamax, the upper limit is used as the effective synchronous injection time. An ineffective injection time gammav determined at the time of the fall in the battery voltage is added to the effective synchronous injection time gammal to determine a synchronous injection time gammas to control injection valves 36.

Inventors

• 👤 Nobuyuki Kobayashi
• 👤 伸之 小林
• 👤 Hiroshi Ito
• 👤 博 伊藤
• 👤 Takahide Hisama
• 👤 隆秀 久間

Bibliographic Details