在对斜盘柱塞式液压变压器进行受力分析的基础上，建立了斜盘柱塞式液压变压器各配流口在液压变压器控制角为零和不为零时的扭矩的数学模型，并运用Matlab 进行了仿真研究，发现各配流口的扭矩是不连续的，在两个周期间过渡时存在扭矩跳动．文中还建立了扭矩跳动系数的模型，并进行了仿真，发现液压变压器的扭矩跳动系数很大，且随控制角而变化． 液压变压器较高的扭矩跳动系数是液压变压器运行不平稳的原因．

Based on the mechanical analysis of the plate-inclined plunger-type hydraulic transformer,a mathematical model describing the instantaneous torque of the fluid-distribution ports is established in the conditions that the control angle is equal or unequal to zero. Then,a simulation is carried out with Matlab,finding that the torque of each fluid-distribution port is discontinuous,and that there exists torque beating between two cycles. Finally,a mathematical model describing the torque-beating coefficient is established,followed by a simulation test. The results show that the torque-beating coefficient varying with the control angle is rather high,which results in the unstable operation of hydraulic transformer.