Control of fuel injection amount in diesel engine

Abstract

Abstract PURPOSE:To permit to prevent deterioration of output in case of using a fuel having comparatively small specific gravity and calorific value within the allowable range of generating black smoke by a method wherein the specific gravity of the using fuel is detected and the fuel injection amount is determined by utilizing the detected specific gravity as one of parameters. CONSTITUTION:An electronic fuel injection control circuit 1, consisting of microcomputers, determines the fuel injection amount by an operating condition detected by a revolving number sensor 2, a load sensor 3, a suction air pressure sensor 4, a water temperature sensor 5 and other operating conditions sensor 7 in accordance with a predetermined program. The circuit 1 also measures the specific gravities of using fuel by a bubble type gravimeter 6, consisting of two pieces of air pipes 10-1, 10-2 and a piezo converting element 11, operates a correcting weight increase DELTAQrho to correct the determined fuel injection amount and injects the fuel from an injector 9-1, 9-2... through an injection amount regulating member 8. The weight increase correction is not effected when the revolving number of the engine is higher than 5,000rpm to prevent the overrunning of the engine. Thus, the deterioration of the output in case the fuel having small specific gravity and calorific value is utilized may be restricted by effecting the increase of injecting fuel within the allowable range of discharging black smoke.

Inventors

• 👤 Keisuke Tsukamoto
• 👤 啓介 塚本
• 👤 Masaomi Nagase
• 👤 長瀬　昌臣
• 👤 Kiyotaka Matsuno
• 👤 松野　清隆

Bibliographic Details