Vacuum Actuator Work Efficacy and Its Smart Survey Entry Analysis

The vacuum booster works in a non-working state. The diaphragm in the booster is suspended in vacuum and is balanced by the vacuum of the front and rear chambers and the return spring. At this time, the front and rear chambers of the booster are connected through the control valve chamber, and the air valve port is closed. After the engine starts to work, the vacuum degree of the front chamber of the booster is equal to the vacuum degree of the rear chamber, that is, both are equal. 0.0667Pa.

Due to the strict requirements on the vacuum degree of the booster, the pressure on the force bearing surface of the feedback disk is required to be equal. Therefore, the material requirements of the feedback disk are also more stringent. As the input force of the control valve push rod increases, the servo force is also increasing. As the ground increases, the two have a positive proportional relationship and the servo force ratio also increases, so the driver will have a good sense of maneuverability and follow-up during the braking process. Because the generated servo force is a finite set value, when the value of the servo force reaches the maximum, that is, the vacuum degree of the rear chamber is zero, the servo force is a constant at this time, and the output force of the booster follows. The growth of input power increases, and the increase is the same.

When the brake is stopped, the brake pedal force disappears. As the input force is gradually reduced, the control valve push rod continuously moves backward. When the boosting effect reaches a peak value, the return spring pushes the diaphragm back to the equilibrium position, and the joystick Right movement, the air valve just closes, the vacuum valve opens, the channels of the front and rear chambers are connected, and both sides of the diaphragm have the same degree of vacuum again.

After the brake is stabilized (ie, when the brake is maintained), eg. At this time, both the vacuum valve port and the air valve port of the control valve are deformed due to the pressure difference, that is, the vacuum valve port and the air valve port are both in the closed state, which is the third equilibrium position of the booster. When the booster seal is detected, it is finally in this equilibrium position.

The main work process of automatic detection As the testing equipment discussed in this paper can achieve the detection requirements of the dual-assisted ratio product, there is no difference between the hardware and single assistance ratio of the dual-assisted product testing equipment, and only the characteristic point and assist ratio are increased on the power curve. At the same time can achieve a variety of product testing, so we must first select the test product standard curve and seal detection conditions.

(1) Manually insert the product to be tested into the equipment fixture, press the two-hand start button, and the slide table will send the fixture to the testing position. (2) Start the test, lift the cylinder up and the stopper out, then lift the cylinder back down. (3) The upper cylinder drives the simulated front housing device with corresponding product return spring to clamp down the product, and the Beli cylinder is lifted up.

Conclusion The analysis of the vacuum brake self-test is only to assess the correctness of the product assembly, and it is also the main means of verifying the rationality of the design. A comprehensive analysis of the testing process of the positive air booster and understanding of the source of its test indicators will promote product design, manufacturing and assembly, and improvement of experimental methods. It will help promote the standardization, serialization, and product quality of vacuum boosters and a wide range of Technology Exchange.