The amplitudes of strong pull-in current and hold-on current passing through the high speed solenoid valve were regulated accurately by using hysteresis control to realize pulse width modulation of the voltage of fast solenoid valve, the duty cycle of the current pulse passing through the high speed solenoid valve was controlled by variable frequency control with variable duty cycle, and the protection functions of input overvoltage, input undervoltage and output short circuit were designed. A high speed solenoid valve control instrument was designed based on hysteresis control method. By using the proposed high speed solenoid valve control instrument during the maintenance of aeroengine high speed solenoid valve and main fuel control accessories, the fault of main fuel system of aeroengine caused by unstable input signal of controller was eliminated. Benefited from strong anti-interference ability of the proposed instrument, instrument damage caused by misoperation in the maintenance process was prevent, maintenance quality of high speed solenoid valve has been improved.
| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |