Gear-shifting control system of automatic transmission

A gear-shifting control system of an automatic transmission, comprising a main pump and four gear-shifting cylinders, wherein the gear-shifting control system further comprises:

• a gear-shifting control valve, the gear-shifting control valve has an inlet and two outlets, the gear-shifting control valve can switch between a first working position and a second working position, when the gear-shifting control valve is in the first working position, the inlet is in fluid communication with one of the two outlets, when the gear-shifting control valve is in the second working position, the inlet is in fluid communication with the other one of the two outlets;
• a first gear switching valve, the first gear switching valve has two inlets, four outlets, a first control end, and a second control end, the first control end and the second control end of the first gear switching valve are respectively located at two ends of the first gear switching valve, the first gear switching valve can switch between a first working position and a second working position, when the first gear switching valve is in the first working position, the two inlets of the first gear switching valve are respectively in fluid communication with two of the four outlets of the first gear switching valve, when the first gear switching valve is in the second working position, the two inlets of the first gear switching valve are respectively in fluid communication with the other two of the four outlets of the first gear switching valve;
• a second gear switching valve, the second gear switching valve has two inlets, four outlets, a first control end and a second control end, the first control end and the second control end of the second gear switching valve are respectively located at two ends of the second gear switching valve, the second gear switching valve can switch between a first working position and a second working position, when the second gear switching valve is in the first working position, the two inlets of the second gear switching valve are respectively in fluid communication with two of the four outlets of the second gear switching valve, when the second gear switching valve is in the second working position, the two inlets of the second gear switching valve are respectively in fluid communication with the other two of the four outlets of the second gear switching valve;
• a first gear on-off valve, the first gear on-off valve is connected between the first gear switching valve and the gear-shifting control valve, the first gear on-off valve can switch between a closed position and an opened position, when the first gear on-off valve is in the closed position, the two outlets of the gear-shifting control valve are respectively isolated from the two inlets of the first gear switching valve, when the first gear on-off valve is in the opened position, the two outlets of the gear-shifting control valve are respectively in fluid communication with the two inlets of the first gear switching valve;
• a second gear on-off valve, the second gear on-off valve is connected between the second gear switching valve and the gear-shifting control valve, the second gear on-off valve can switch between a closed position and an opened position, when the second gear on-off valve is in the closed position, the two outlets of the gear-shifting control valve are respectively isolated from the two inlets of the second gear switching valve, when the second gear on-off valve is in the opened position, the two outlets of the gear-shifting control valve are respectively in fluid communication with the two inlets of the second gear switching valve;
• an odd-even selecting valve, the odd-even selecting valve has an inlet, a first outlet, a second outlet, a first control end, and a second control end, the first control end and the second control end of the odd-even selecting valve are respectively located at two ends of the odd-even selecting valve, the first outlet of the odd-even selecting valve is connected with the first control end of the first gear switching valve and the first control end of the second gear switching valve, the second outlet of the odd-even selecting valve is connected with the second control end of the first gear switching valve and the second control end of the second gear switching valve;
• the odd-even selecting valve can switch between a first working position and a second working position, when the odd-even selecting valve is in the first working position, the inlet of the odd-even selecting valve is in fluid communication with the first outlet of the odd-even selecting valve, when the odd-even selecting valve is in the second working position, the inlet of the odd-even selecting valve is in fluid communication with the second outlet of the odd-even selecting valve;
• a first clutch solenoid valve, the first clutch solenoid valve is used for controlling the engagement of a first clutch, the first clutch solenoid valve has an inlet and an outlet, the outlet of the first clutch solenoid valve is connected with the first control end of the odd-even selecting valve;
• a second clutch solenoid valve, the second clutch solenoid valve is used for controlling the engagement of a second clutch, the second clutch solenoid valve has an inlet and an outlet, the outlet of the second clutch solenoid valve is connected with the second control end of the odd-even selecting valve;
• the four outlets of the first gear switching valve are connected with two of the four gear-shifting cylinders, the four outlets of the second gear switching valve are connected with the other two of the four gear-shifting cylinders.