从理论上推导了内燃机处于突发工况时，转速波动的变化规律和计算式，并介绍了计算实例和内燃机瞬时转速的测试结果，为设计、改进内燃机提供了有益的依据 The law and calculation formula of the fluctuation of engine speed when the internal combustion engine is under sudden working conditions are deduced theoretically. The calculation results and the test results of the engine instantaneous speed are introduced, which provide a good basis for designing and improving the internal combustion engine