Electromagnetic control valve for controlling hydraulic retarder

The utility model provides an electromagnetic control valve for controlling a hydraulic retarder, which comprises an electromagnetic coil part, the electromagnetic coil part comprises a shell, a coil, a rear yoke and an inner cover are arranged in the shell, a plunger, an ejector pin and a front yoke are arranged in the inner cover, and the ejector pin and the front yoke are coaxially connected with the plunger. The shell, the front yoke, the rear yoke and the plunger form a closed magnetic field; the valve body comprises a valve sleeve, an oil inlet and an oil outlet are formed in the side wall of the valve sleeve, a valve element is arranged in the valve sleeve and axially connected with the ejector pin, a spring is arranged at the end, away from the electromagnetic coil part, of the valve element in a sleeving mode, and the plunger axially moves in the inner cover under the action of magnetic field force. And the ejector pin and the valve core are driven to compress the spring. The electromagnetic valve ha