Abstract: In order to demonstrate the influence of fuel temperature variation on fuel injection quantity of high pressure common rail system (HPCR), the calculation correction of fuel injection parameters at different temperatures is conducted. Firstly, based on a brief analysis of the characteristic of fuel flow and heat transfer of the HPCR system and according to the working temperature range of diesel engine, a method to determine the reference temperature is put forward. Then, the formula for calculating the corrected quantity of fuel injection quantity and injection pressure is provided by using the method of fluid heat transfer calculation. Finally, combined with real cases, basic MAP of fuel injection pressure and injection quantity under basic temperature is given and corrected MAP of fuel injection pressure and injection quantity is calculated. The results show that the relative error between the calculation and measurement value of fuel injection correction at 50 ℃ is less than 14%, and that between the calculated value and the predicted value at 80 ℃ is less than 9%, which shows the calculation method of fuel injection parameter correction is effective.

Key words: power machinery and engineering, fuel injection quantity, high pressure common rail, temperature