| 摘要 |
PURPOSE:To obtain high heat efficiency irrespective of property characteristics of fuel to be used and greatly improve the fuel consumption by detecting the property characteristics of the fuel and setting an optimum compression ratio according to the result of detection. CONSTITUTION:Property characteristics of fuel to be supplied from a fuel tank 12 to a fuel supplying device 10, e.g., a concentration of alcohol fuel is detected by a sensor 20, and a result of detection is input to a computer 13. The computer 13 carries out predetermined calculation according to a detection signal so as to conduct optimum control, and outputs control signals as calculated to a fuel supplying device 10, compression ratio varying device 14 and ignition device 15, so that an air-fuel ratio, compression ratio and ignition timing of an internal combustion engine 1 may be set to optimum values, respectively. Accordingly, an optimum compression ratio may be set in accordance with the property characteristics of the fuel to be used, thereby obtaining high heat efficiency irrespective of the property characteristics of the fuel.
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