Joint control mechanism for actively controlling rigidity and height of double-cavity air spring and application method of joint control mechanism

The joint control mechanism capable of actively controlling the rigidity and the height of the double-cavity air spring comprises an outer air inlet channel, a first electric control valve of the outer air inlet channel, an outer exhaust channel, a second electric control valve of the outer exhaust channel, an inner air channel and an electric control two-way valve of the inner air channel, the outer air inlet channel and the outer exhaust channel are communicated with an upper cavity or a lower cavity, and the inner air channel is communicated with the upper cavity and the lower cavity. The two-way air pump is connected with the electric control two-way valve in parallel and arranged on the inner air duct, the electric control unit is used for controlling the first electric control valve, the second electric control valve, the electric control two-way valve and the two-way air pump, and the upper integrated sensor and the lower integrated sensor provide air pressure data for the electric control unit and are