暖機走行中のディーゼル機関各部の温度上昇と燃費の推定 : 第2報, ヒートバランスと走行燃費の推定
1992 年 58 巻 546 号 p. 607-612
詳細
1992 年 58 巻 546 号 p. 607-612
The fuel economy in a vehicle deteriorates at low temperature. The main reason is the increase of friction loss. In the previous report, it was shown that the friction loss changes with cylinder wall temperature, and that the cylinder wall temperature can be estimated by a simplified heat transfer model. In this report, the indicated thermal efficiency was obtained from the heat balance measured at road load conditions. It was found that the indicated thermal efficiency correlated with the cylinder wall temperature. Thus, when the cylinder wall temperature was simulated, the friction loss and the indicated thermal efficiency were estimated. Since the indicated power is the sum of running resistance and friction loss, the fuel consumption can be calculated from the equation between the indicated power and the indicated thermal efficiency.
