匹配柔性风扇，降低功率消耗，是目前车用发动机节能降耗的一个重要手段。电控硅油风扇相比于传统的刚性直连风扇、三速电磁风扇，具有较宽的转速调制范围。为了更为精准地控制风扇转速，尽可能降低功率消耗，当前基于风扇转速的PID闭环控制越来越多地被应用到硅油风扇的控制上。但是由于硅油离合器内部簧片弹性特性、硅油黏度特性、电磁阀占空比驱动特性、全啮合脱开特性等因素影响，在实际应用中经常会出现部分转速区间很难控制或者无法稳定等现象。提出了一种硅油风扇转速波动抑制方法，通过传统PID闭环控制加动态积分冻结技术，实现风扇转速的平稳控制，极大解决了风扇控制死区内的转速波动问题。在某款挖掘机上开展定点稳态试验和瞬态变速试验，结果表明该技术能够有效消除风扇死区工况点转速波动现象，转速波动工况百分比由18.3%降低为0%。

Matching flexible fans and reducing power consumption is an important means to reduce fuel consumption for engines. Compared with traditional direct-connected fans and three-speed electromagnetic fans, electronically controlled silicone oil fans had a wider speed governor modulation range. To control fan speed more accurately and minimize power consumption, PID closed-loop control based on fan speed was increasingly applied to silicone oil fans.But certain speed ranges were difficult to stabilize because of the elastic properties of internal spring, the viscosity characteristics of silicone oil, solenoid valve duty cycle drive characteristics, and the disengagement characteristic. A method was hence put forward to suppress the speed fluctuation of silicone oil fans by combining traditional PID closed-loop control with dynamic integral freezing technology, achieving smooth fan control and greatly solving the problem of speed fluctuation in the control dead zone of fans. By carrying out fixed-point steady-state tests and transient variable-speed tests on a certain excavator, the technology could effectively eliminate the phenomenon of speed fluctuation at the fan dead zone operating point, and the percentage of speed fluctuation operating conditions reduced from 18.3% to 0%.