Hydraulic, device and winter spring Shenzhen Tefa Huari Automobile Enterprise Co., Ltd. 518029 Wang Guixing connects the suspension of the car body and the wheel to absorb the impact from the road surface to maintain the body posture to improve driving stability and improve ride comfort. With the improvement of road conditions and the substantial increase of vehicle speed, people have put forward higher requirements for the performance of modern car suspensions, making electronically controlled suspensions increasingly widely used. The actuator to be executed is the damper and the spring. In the conventional suspension, the damping force is used in the unregulated suspension. The damping force adjustable hydraulic damper and the variable coefficient spring gas are used. It can not only meet the requirements of ride comfort and driving stability, but also effectively prevent the car from causing a tilting of the head and the head during operation, and improve the steering stability. This paper introduces the structural working principle and maintenance method of the hydraulic damper and gas spring of the main components of the electronically controlled suspension. The structure and working principle of the 1 hydraulic damper and the gas spring are controlled by the hydraulic damper and spring. The servo motor red brain sensor is composed of a lamp and a control sweat switch. The hydraulic shock absorber and the gas spring are assembled in a hungry integrated suspension strut assembly, which is a gas spring supporting the body; the lower part is The hydraulic damper is connected to the front and rear wheels through the lower arm knuckle or axle housing of the bracket. The stiffness of the gas spring will increase with the increase of the load, and it can absorb the instantaneous vibration; the hydraulic damper can quickly absorb the vibration energy, accelerate the vibration of the frame or the body vibration, and improve the driving stability of the car 1 and . If the compressed air is passed through the suspension struts, the suspension struts are also adjusted to adjust the height of the body!
Degree of function gas spring 2 sub-gas slug hydraulic shock absorber structure and working principle Hydraulic shock absorber is adjustable damping force. The upper part of the outer tube of the hydraulic damper stores nitrogen gas with a pressure of 131.5, and the lower part is filled with a viscosity-stable damper liquid through which the inner tube of the bottom valve of the lower end communicates. In the inner tube, there is a rotary slide valve 2 driven by a rotary slide valve control rod. By rotating the rotary valve control rod to rotate the rotary slide valve, the opening and closing of the two holes can be controlled, thereby changing the damping force of the hydraulic damper.
There are 3 high, medium and low levels. When the two measuring holes are opened, the damper fluid can flow through the two measuring holes when the body bounce hydraulic damper expands and contracts, and the hydraulic damper device has a low damping force; when there is only one 1 rotary slide valve 2 When the rotary slide valve opening is opened, the hydraulic shock absorber is screwed to sweat 3.4, and the bore has a medium damping force; and when the two 2 hydraulic shock absorbers are closed, the hydraulic shock absorber has a damping force. . The purpose of filling the outer tube with nitrogen is to stabilize the change in the damping force of the hydraulic damper. The inactivity of nitrogen fly can reduce the occurrence of holes and mixing in the damper fluid, reducing noise during operation.
The advantage of the gas spring is that the stiffness varies with the load. The car bounces sharply when driving on the bumpy road. The gas in the gas spring is pressurized, the air pressure is increased, and the stiffness of the gas spring is increased. When the car is driving on a flat road, the opposite is true. . In the electronically controlled suspension, the stiffness of the gas spring is also controlled by the computer through the servo motor, so that the stiffness change of the gas spring can best meet the requirements of the suspension performance. The gas spring is mainly composed of the main air chamber sub air chamber air valve air valve control rod. The composition of the rotary air valve spool can change or close the gas passage between the main air chamber and the auxiliary air chamber, thereby changing the stiffness of the gas spring; the air valve spool is rotated by the servo motor through the air valve control rod to rotate the gas spring. , weak and strong 3 levels. When the air valve spool is 1 rotary slide valve control lever 2 air valve control lever 3 sub air chamber 4 main air chamber 5 air valve valve body 6 small air passage 7 air valve 8 large air passage air valve spool opening to large When the air passages communicate, the gas in the main air chamber passes through the middle hole of the air valve spool, and the large air passage communicates with the gas in the auxiliary air chamber, which is equivalent to the increase of the volume of the main air chamber. The amount of gas is increased, the stiffness of the gas spring is weak; when the opening of the air valve spool is turned into communication with the small air passage, the empty parent flow bin between the two air chambers is limited, and the gas spring has medium rigidity; When the opening of the air valve spool is turned to the size of the air passage, only the parent in the main air chamber participates, and the stiffness of the gas spring is tough.
1.3 Servo motor hydraulic damper rotary slide valve control rod and gas spring air valve control rod rotation is driven by the servo motor 4 of the suspension strut assembly end, the servo motor can change the hydraulic damper within 120 Damping force and stiffness of the gas spring to respond to frequently changing driving conditions.
The servo motor has a 2-phase stator winding. When the phase windings are energized in the forward and reverse directions, when the damping force of the hydraulic damper and the other phase windings of the gas spring are energized, they can be turned back to the medium damping force and the low damping force. And weak stiffness; in the case of high-speed driving, the opposite is true, with high damping force and strong stiffness; when the car makes a sharp turn, they are respectively converted to high damping force and strong stiffness to overcome the body roll caused by centrifugal force; The computer only adjusts the state of the rear or front suspension strut assembly during acceleration or sudden braking to prevent the vehicle from sitting or sinking. Related signals.
The electronically controlled suspension control switch is push-button type and is mounted on the left side of the automatic transmission joystick. When it is in the standard state, the hydraulic damper and the gas spring have low damping force and weak stiffness respectively; when it is in the moving position 80, the hydraulic damper and the gas spring have medium damping force and medium stiffness respectively. , 1 suspension finger , 2 suspension control switch 3 宵 valve position sensor 4 engine computer 5 vehicle speed sensor steering sensor 7 ignition switch 8 brake light switch brake light 1 front suspension actuator servo motor rear suspension actuator servo motor The rotor of the 12-suspension computer and the medium-stiffness servo motor is a pole type, which is made up of the detection of the permanent magnet 2 hydraulic damper and the gas spring. Even if the stator is not energized, the stator can be stabilized in a certain suspension. The performance of the strut assembly has a long decay period, generally in the car position.
1.4 Suspension control circuit The hydraulic damper of the electronically controlled suspension rotates the sliding control lever and the gas spring air valve control rod is driven by the servo motor, while the servo motor is driven by the computer 0; the control suspension control circuit 5. The computer passes After the sensor detects the driving condition of the vehicle, the suspension strut assembly is adjusted to a predetermined state. When the vehicle is traveling at a low speed, the hydraulic damper and the gas spring respectively have 1 rotary slide valve control rod 2 permanent magnet rotor 3 stator winding 4 The stator core 5 air valve control lever gradually deteriorates after driving for 40,000 to produce a certain feeling of discomfort. If the ride feels abnormal, you should first understand the changes in the posture of the vehicle in the state of stationary and driving, and then judge the working condition of the operating parts. Do not rush to perform the replacement, so as to avoid passive maintenance.
2.1 External inspection of the suspension strut assembly 3. Check the leakage. First, observe whether there is oil stain on the outside of the suspension strut assembly. If there is, the suspension strut assembly has oil leakage fault. Then, wipe the exterior of the strut assembly and apply soapy water to observe whether there is foam. If any, the suspension strut assembly has an outgassing fault. If the strut assembly seeps out, it will often make an abnormal noise. Check the strength of the suspension strut assembly. Under the condition that the tire pressure is sufficient and the suspension stabilizes the torsion bar, the corner of the car is pressed down with a ping. At this time, there should be obvious resistance. After the hand is released, the body should be able to quickly return to the original position, and there are many times. The up and down oscillations, otherwise the damping effect of the suspension struts assembly hydraulic damper is poor.
2.2 Fault code check If the suspension control circuit is faulty with the Lexus 8 400 sedan, the height of the lamp on the instrument panel will flash directly. The fault code can be read by shorting the 1 and 1 terminals of the diagnostic socket. The fault code associated with the suspension does not include the sensor fault code. There are 4 222, 61 and 72. Among them, 2 and 22 respectively have front and rear suspension circuits that are faulty, 6 are out of order, and 72 has no supply voltage on the suspension actuator or The fuse is broken.
0, the lamp can also display the small sensor and the fault code of the off circuit, its contents such as 1 listed fault code to the sensor circuit bad brake light switch circuit bad gate control lamp sweat off circuit bad throttle position sensor circuit bad speed sensor circuit Poor height control, off circuit, poor suspension strength control switch circuit, faulty 23 steering sensor detection steering sensor, number detection method 1 Take Lexus 1 400 sedan as an example, short-circuit the rectangular diagnostic socket after turning on the ignition switch Terminal. Then, while turning the steering wheel, observe the condition of the 0 lamp to judge that the sensor is normal. After the steering wheel is positive, the normal light should be displayed from the 汛1 lamp when the engine is stopped, and the light should be always bright when the engine is running. Turn the steering wheel to 36. When the engine stops running, the team continues to gram. When the engine is running, the light should show the normal code, such as 0. The condition of the lamp and the + sign, then the steering sensor circuit is faulty.
2.4 Detection of the servo motor 1 The electric field between the terminals of the electric motor is measured. Toyota Ling Xiao.
The resistance value between the 12-end and the 34-end of the 400 car servo motor should be 3 060. The resistance between the 2 and 4 terminals should be 2.3 for 04.310; otherwise, the servo motor is faulty, b checks the servo motor's action will be The terminal of the eye motor shall be rotated by the corresponding negative direction of the motor of the ten negative poles of the power supply; otherwise. The motor is faulty. Note that when the power is on, more than 25 models are repaired, and there are 95 models with a screw-on suspension. The body floats slightly when turning. The occupant, the discomfort of the nephew, the owner is also worried that the car has seven safety hidden dangers. The electric suspension system is particularly leaky. When repairing the car, it often happens that the failure of the piston ring is neglected. Here are two examples that we have encountered, hoping to arouse everyone's noise. When the engine is overhauled, the engine has no abnormal noise. When the water temperature of the engine rises to the normal working temperature, the metal impact sound of the cymbal can be heard in the upper part of the first cylinder and the second cylinder. As the rise increases, the sound of the engine becomes dull and the speed decreases. After the engine is dismantled, the cylinder is pulled out at the end of the inspection; the piston pin and the copper sleeve piston pin hole are normally matched; the piston skirt, the diameter cylinder diameter piston and the cylinder are all normal; the piston rings of each cylinder are repaired at the same level. Dimensions, the gap and the gap are normal, but the backlash of the first air ring is smaller than the standard 0.4. After replacing the piston ring, the original flash with the first air ring backlash is too small. The squat is too large, I ignored the careful examination of the various dimensions of the piston ring when overhauling the engine. The piston ring is not matched, so that the oil consumption is increased. The 吮091 type car has increased the consumption of oil after driving for several kilometers. The exhaust pipe emits black smoke. After removing the piston, I have 1 pair. The cylinder was inspected and found that the cylinder was inspected in the first piston ring. It was found that the first piston ring installed in the vehicle did not liberate the outer chrome-plated barrel ring of the 1091 type, but was liberated. 1 Feeding the piston ring of the car to replace the piston ring 即 fault, which eliminates the reason why the piston ring is not matched. It is also enough that we neglect the careful inspection of the piston ring when overhauling the engine. From the above 2 cases, we can see When repairing the engine, pay attention to the inspection of the piston ring. When the quality of the piston is unclear, it should be taken seriously. The body posture of the 199921 is stable and symmetrical. 4 suspension supports, the assembly is well damped. The fault code read during the start and braking is usually 82. The steering sensor circuit is bad. Our door finds the steering sensor when checking the circuit. After the connector is in contact with the patch, the connector is installed. The phenomenon of eliminating the problem is that the Fan Aimin of the College of Engineering of the China University of Tropical Industry wants to present the piston ring.
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