Method of increasing fuel amount upon acceleration due to electronically controlled fuel injection of internal-combustion engine

Abstract

Abstract PURPOSE:To control the variation of air-fuel ratio upon acceleration, by compensating an initial value which is selected in accordance with the engine operating condition, in view of a deiviation of air-fuel ratio with respect to an air-fuel ratio upon acceleration, and by carrying out the increment of fuel upon acceleration in accordance with the increment characteristic having the compensated initial value. CONSTITUTION:An electronically controlled fuel injection device compensates a fuel injection amount which is obtained by a control circuit 1 based upon the outputs of an intake-air amount detecting device 2, a rotational speed sensor 3, etc., in accordance with the output of an air-fuel ratio sensor 6, and therefore, the valve-opening time of a fuel injection valve 8 is calculated. In this case, upon acceleration the output of the air-fuel ratio sensor 6 is compared with a predetermined voltage level, and both lean and rich values of mixture are detected so that a deviation of the air-fuel ratio is detected by measuring the duration times of the lean and ritch upon acceleration. Next the initial value of a fuel increment upon acceleration which is determined by the engine operating condition including, for example, a cooling water temperature, is compensated by the above-mentioned deviation of air-fuel ratio to be converted into an increment characteristic having a damping characteristic varying its incrination, and thereafter, the valve-opening time of the fuel injection valve 8 is conpensated to the increment side.

Inventors

• 👤 Tsutomu Saito
• 👤 斎藤　努
• 👤 Tsuneyuki Egami
• 👤 常幸 江上
• 👤 Tokio Kohama
• 👤 時男 小浜
• 👤 Kimitaka Saito
• 👤 公孝 斎藤
• 👤 Masaru Takahashi
• 👤 大 高橋
• 👤 Susumu Nogami
• 👤 野上　進

Bibliographic Details