Automatic pressure regulating valve for multiple levels of driving automation of commercial vehicle and control method thereof

An automatic pressure regulating valve for multiple levels of driving automation of a commercial vehicle, comprising an upper valve body, a lower valve body, a piston, a main valve core assembly, a switching valve, a quick-acting intake valve, and a quick-acting exhaust valve, wherein the switching valve, the quick-acting intake valve and the quick-acting exhaust valve are all mounted at an upper end of the upper valve body;

• the piston is located in a chamber formed by the upper valve body and the lower valve body to divide the chamber into an upper control chamber and a lower chamber;
• and the main valve core assembly is mounted in the lower valve body;
• and
• wherein the quick-acting intake valve is a normally open two-position three-way electromagnetic valve;
• in case of failures such as de-energization and system power failure, the air inlet d and an air outlet e of the quick-acting intake valve are communicated with each other;
• the air inlet d of the quick-acting intake valve is connected to an air outlet c of the switching valve;
• the air outlet of the quick-acting intake valve is connected to the control chamber A of the upper valve body;
• the quick-acting exhaust valve is a normally closed two-position three-way electromagnetic valve;
• in case of failures such as de-energization and system power failure, an air inlet f and an air outlet g of the quick-acting exhaust valve are not communicated with each other;
• the air inlet of the quick-acting exhaust valve is connected to the control chamber A of the upper valve body, while the air outlet is connected to the atmosphere and provided with a muffler;
• the quick-acting intake valve and the quick-acting exhaust valve are utilized to control air intake and exhaust to regulate a pressure of the control chamber, thereby regulating a braking pressure.