The influence of altitude on the performance of automotive diesel engines
Performance emission tests of diesel engines at different altitudes were conducted on a high-altitude simulation test bench.Results show that as the altitude increases,the intake mass flow rate decreases and the oxygen content in the air decreases,which has a significant impact on the maximum torque output at high and low speeds.However,its impact is relatively small at intermediate speeds.As the altitude increases,both the combustion efficiency in the cylinder and the power output decrease.As the altitude increases,the exhaust smoke intensity increases,with smoke being more sensitive to altitude at low speeds and high loads.When the altitude is 1 900 m,the NOx emission concentration is basically equivalent to that in the plain.When the altitude continues to increase to 2 400 m,the NOx emission con-centration is significantly higher than that in the plain.
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