阅读说明：本技术 一种用于商用汽车的智能化电控空气悬架系统 (Intelligent electric control air suspension system for commercial automobile ) 是由 郁捷杰 张威 于 2019-10-28 设计创作，主要内容包括：本发明提供了一种用于商用汽车的智能化电控空气悬架系统,由集成ECU、空气压缩机、三合一传感器、刚度可变空气弹簧、供气管路、线束、按键、储气罐、压力传感器等构成。通过三合一传感器实时监测气囊的高度、气压、温度。通过将气囊高度与系统内的存储高度进行比对并结合当前车辆状态以及路况,控制气囊的充放气实现多种车身高度的调节。通过气囊内置电磁阀的通断实现气囊刚度调节,避免过弯以及刹车时的侧倾和“点头”现象,实现车辆行驶舒适性与操纵稳定性的兼顾。通过气囊气压值精确计算出车辆轴荷并进行超载报警,更好地避免商用汽车的超载问题。实时监测气囊温度,模拟出气囊的健康程度,为空气悬架提供智能化服务。(The invention provides an intelligent electric control air suspension system for a commercial automobile, which comprises an integrated ECU, an air compressor, a three-in-one sensor, a rigidity-variable air spring, an air supply pipeline, a wire harness, keys, an air storage tank, a pressure sensor and the like. The height, the air pressure and the temperature of the air bag are monitored in real time through the three-in-one sensor. The height of the air bag is compared with the storage height in the system, and the air bag is controlled to be inflated and deflated to adjust the heights of various vehicle bodies by combining the current vehicle state and road condition. The rigidity adjustment of the air bag is realized through the on-off of the electromagnetic valve arranged in the air bag, the phenomena of over-bending, side inclination and 'nodding' during braking are avoided, and the consideration of the driving comfort and the operation stability of the vehicle is realized. The axle load of the vehicle is accurately calculated through the air pressure value of the air bag, overload alarm is carried out, and the overload problem of the commercial vehicle is better avoided. The temperature of the air bag is monitored in real time, the health degree of the air bag is simulated, and intelligent service is provided for the air suspension.)

1. An intelligent electrically-controlled air suspension system for a commercial automobile is characterized by comprising an integrated ECU, an air compressor, a plurality of three-in-one sensors, a plurality of rigidity-variable air springs and an air storage tank; the air supply of each air spring with variable rigidity can be carried out through a compressor or an air storage tank, and the air storage tank is preferentially used for supplying air by the system in consideration of NVH of the whole vehicle; meanwhile, each rigidity-variable air spring can also exhaust air through an exhaust electromagnetic valve; the outlet of the air storage tank is connected with the rigidity variable air spring through an air path and an air bag electromagnetic valve, and the inlet of the air storage tank is connected with the air compressor through an air storage tank electromagnetic valve, an air dryer, a throttle valve silencer, an air filter, the pressure sensor and a pipeline; each three-in-one sensor is arranged on the corresponding rigidity-variable air spring upper cover and is used for detecting height change values, air pressure and temperature data of the corresponding rigidity-variable air spring; all the three-in-one sensors are communicated with the integrated ECU through a CAN, and a control signal output end of the integrated ECU is connected with the air bag electromagnetic valve, the air storage tank electromagnetic valve and the exhaust electromagnetic valve through a control wire harness; the integrated ECU is also communicated with the whole vehicle through a CAN to acquire the speed, door signals, engine signals and the like of the whole vehicle; the integrated ECU is also connected with a key with an LED display through a wire harness, the key is used for adjusting the height of the vehicle body, and the LED display lamp is used for displaying the height state of the vehicle and system faults.

2. The intelligent electronically controlled air suspension system for a commercial vehicle of claim 1, wherein a plurality of air bag solenoid valves, air tank solenoid valves and control circuit boards are integrated in said integrated EUC.

3. The intelligent electronically controlled air suspension system for commercial vehicles as claimed in claim 1, wherein said triad sensor is formed by a distance measuring sensor, an air pressure sensor and a temperature sensor, which are fixed to the airbag upper cover in a screw form.

4. An intelligent electronically controlled air suspension system for a commercial vehicle as claimed in claim 3 wherein said distance measuring transducer uses ultrasonic principles for measuring distance for monitoring changes in air bag height to reflect changes in vehicle body height.

5. The intelligent electronically controlled air suspension system for a commercial vehicle of claim 3, wherein said air pressure sensor comprises a back-inlet absolute pressure sensor for monitoring air pressure of an air bag in said variable stiffness air spring.

6. The intelligent electronically controlled air suspension system for a commercial vehicle of claim 1, wherein said temperature sensor is a pulsed digital temperature sensor for real time monitoring of the temperature inside the air bag of said variable stiffness air spring.

7. The intelligent electronically controlled air suspension system for a commercial vehicle of claim 1, wherein said triad sensor employs a protection rating of IP6K 9K.

8. The intelligent electronically controlled air suspension system for commercial vehicles according to claim 1, wherein all of said plurality of triad sensors are connected to said signal input of said integrated ECU by a CAN and waterproof connector.

9. The intelligent electrically controlled air suspension system for commercial vehicle according to claim 1, wherein a built-in solenoid valve is installed between an air chamber of an air bag and a piston air chamber in the stiffness variable air spring, the built-in solenoid valve is connected with the integrated ECU through the control harness, and the integrated ECU realizes the stiffness adjusting function by controlling the on-off of the built-in solenoid valve to realize the communication and the blocking between the air chamber of the air bag and the piston air chamber.

Technical Field

The invention relates to an electronic control air suspension system in the field of automobiles, in particular to an intelligent electronic control air suspension system for a commercial automobile.

Background

The air suspension system is a general term for suspensions in which an air spring is used as an elastic member. Since the air suspension has good road-friendliness and can maintain the natural vibration frequency under any load, it has gained extensive research interest. The conventional air suspension adjusts the inflation and deflation of an air bag through the opening of a mechanical height valve, so that the running height of a vehicle is kept constant. With the continuous development of vehicle control technology, electrically controlled air suspension systems are continuously replacing conventional air suspension systems.

At present, the electric control air suspension system is widely applied and is successfully applied to passenger cars, trucks, and some high-grade SUVs and cars. However, the current electrically controlled air suspension system cannot meet the requirements of diversified users on the air suspension system and further improve the intelligentization degree of the air suspension.

Disclosure of Invention

The invention aims to solve the technical problem of providing an intelligent electric control air suspension system for a commercial automobile aiming at the defects of the existing electric control air suspension system.

The technical problem to be solved by the invention can be realized by the following technical scheme:

an intelligent electrically-controlled air suspension system for a commercial automobile comprises an integrated ECU, an air compressor, a plurality of three-in-one sensors, a plurality of rigidity-variable air springs and an air storage tank; the air supply of each air spring with variable rigidity can be carried out through a compressor or an air storage tank, and the air storage tank is preferentially used for supplying air by the system in consideration of NVH of the whole vehicle; meanwhile, each rigidity-variable air spring can also exhaust air through an exhaust electromagnetic valve; the outlet of the air storage tank is connected with the rigidity variable air spring through an air path and an air bag electromagnetic valve, and the inlet of the air storage tank is connected with the air compressor through an air storage tank electromagnetic valve, an air dryer, a throttle valve, a silencer, an air filter, the pressure sensor and a pipeline; each three-in-one sensor is arranged on the corresponding rigidity-variable air spring upper cover and is used for detecting height change values, air pressure and temperature data of the corresponding rigidity-variable air spring; all the three-in-one sensors are communicated with the integrated ECU through a CAN, and a control signal output end of the integrated ECU is connected with the air bag electromagnetic valve, the air storage tank electromagnetic valve and the exhaust electromagnetic valve through a control wire harness; the integrated ECU is also communicated with the whole vehicle through a CAN to acquire the speed, door signals, engine signals and the like of the whole vehicle; the integrated ECU is also connected with a key with an LED display through a wire harness, the key is used for adjusting the height of the vehicle body, and the LED is used for displaying the height state of the vehicle and system faults.

In a preferred embodiment of the present invention, a plurality of air bag solenoid valves, air tank solenoid valves, and a control circuit board are integrated in the integrated EUC.

In a preferred embodiment of the present invention, the three-in-one sensor is formed by integrating a distance measuring sensor, an air pressure sensor and a temperature sensor, and is fixed on the upper cover of the air bag in a threaded manner.

In a preferred embodiment of the present invention, the distance measuring sensor measures distance using an ultrasonic principle for monitoring a change in height of the airbag to reflect a change in height of the vehicle body.

In a preferred embodiment of the present invention, the air pressure sensor is a back intake absolute pressure sensor for monitoring an air pressure value of the variable stiffness air spring.

In a preferred embodiment of the present invention, the temperature sensor is a pulse digital temperature sensor for monitoring the temperature inside the variable stiffness air spring in real time.

In a preferred embodiment of the present invention, the triad sensor may achieve the protection level of IP6K 9K.

In a preferred embodiment of the present invention, all of the plurality of triad sensors are connected to the signal input of the integrated ECU through a CAN and waterproof connector.

In a preferred embodiment of the present invention, a built-in solenoid valve is installed between an airbag air chamber and a piston air chamber in the stiffness variable air spring, the built-in solenoid valve is connected to the integrated ECU through the control harness, and the integrated ECU controls on/off of the built-in solenoid valve to achieve communication and blocking between the airbag air chamber and the piston air chamber, so as to achieve a stiffness adjusting function.

Due to the adoption of the technical scheme, the height and the rigidity of the air bag are automatically adjusted according to the key signal and the specific road condition, and intelligent control is provided for the air suspension. Meanwhile, the system sends system faults, axle load, vehicle height, air bag states and some system states to the bus in a CAN message mode to be displayed by a host factory, and fault and vehicle height information CAN be displayed through LED lamps on keys.

The height adjustment forms of the integrated ECU of the present invention are roughly divided into the following three types;

1. self-level height adjustment: the integrated ECU acquires the height signal of the vehicle body and compares the height signal with a set height value stored in the system, and the air bag is inflated and deflated according to the comparison result so as to maintain the constant keeping of the running height of the vehicle.

2. Self-adaptive height adjustment: the system automatically adjusts the height of the vehicle body according to the vehicle speed, when the vehicle speed is higher than 30km/h (can be set by self), the system automatically restores the height of the vehicle body to a middle position and forbids to respond to a key signal, and the purpose of doing so is to ensure the running safety of the vehicle; when the vehicle speed is higher than 100km/h (can be set by a user), the height of the vehicle body can automatically sink, so that the operation stability is improved, and the air resistance is reduced, so that the oil consumption is reduced.

3. The key height adjustment is characterized in that the system can adjust any height between the upper limit and the lower limit of the vehicle body height set by the system through keys, and in addition, the specific vehicle body height position can be realized, such as ① middle position, namely the design height value of an automobile, the height is the most common vehicle body height in the driving process of the automobile, ② high position is used for responding to a bumpy road surface and protecting a chassis, ③ low position is used for conveniently passing through some height-limited road sections, and ④ side kneeling height is used for mainly facilitating getting on and off of passengers.

The integrated ECU integrates the control circuit board and the electromagnetic valve into a whole, the whole can reach IP6K9K after assembly, and the integrated ECU has high integration level, small volume and convenient installation.

The three-in-one sensor is arranged on each air bag, and height, air pressure and temperature signals of the air bags are fed back to the integrated ECU in real time through the wiring harness. The trinity sensor is formed by range sensor, baroceptor and temperature sensor set, is fixed in the gasbag upper cover through the form of screw thread. The distance measuring sensor adopts an ultrasonic principle to measure distance and is mainly used for monitoring the height change of the air bag so as to reflect the height change of a vehicle body. The adoption of the scheme avoids the trouble of the installation process of the traditional height sensor (refer to fig. 4) and saves a large amount of arrangement space; meanwhile, the traditional height sensor is connected with a vehicle body through the swing rod, and large errors are easily caused by the deviation of the installation position, so that complicated calibration work is inevitably carried out after the traditional height sensor is installed, and the scheme is simple and accurate through the installation form of thread fixing (refer to fig. 5) and is directly integrated on the air bag by a supplier to carry out integrated supply, so that a host factory and a large amount of calibration work of customers are saved.

The air pressure sensor in the three-in-one sensor adopts a back air inlet absolute pressure sensor, has good environmental reliability, is mainly used for monitoring the air pressure value of the air bag, and on one hand, the axle load of the vehicle can be calculated through the air pressure value of the air bag and overload alarm is carried out, so that the overload problem of the commercial vehicle is avoided; on the other hand, the air pressure value of the air bag can be always kept above the minimum air pressure value of the air bag, so that the shape of the air bag is kept, and the purpose of prolonging the service life of the air bag is achieved.

The temperature sensor in the three-in-one sensor is a pulse digital temperature sensor, so that the temperature in the air bag can be monitored in real time, on one hand, temperature compensation is provided for air pressure detection, and the axle load detection precision is further improved; on the other hand, the current health degree of the air bag can be calculated through the relation between the service life of the air bag and the temperature, and a client is reminded of replacing the air bag in time.

The integrated three-in-one sensor module is high in integration level and small in size, is fixed on the air spring upper cover through threads, can integrally reach the protection level of IP6K9K, and is connected with the integrated ECU through a waterproof connector for power supply and signal transmission.

According to the invention, the built-in electromagnetic valve is arranged between the air bag air chamber and the piston air chamber of the rigidity-variable air spring, and the integrated ECU realizes the communication and the blocking of the air bag air chamber and the piston air chamber by controlling the on-off of the built-in electromagnetic valve. When the vehicle is in an overbending or braking state, the integrated ECU controls the electromagnetic valve to disconnect the air chamber of the air bag from the air chamber of the piston, so that the rigidity of the air bag is improved, and the phenomena of side inclination and 'nodding' of the vehicle are avoided. The vehicle driving comfort and the operation stability are both considered.

Compared with the prior art, the invention has the following advantages:

1. the rigidity variable function of the rigidity variable air spring can ensure the operation stability of the vehicle running and also can give consideration to the comfort.

2. The multiple running heights can be selected by the customer, and the diversified requirements of the customer on different road conditions are met.

3. The three-in-one sensor integrated with the rigidity-variable air spring not only avoids the trouble of the installation process of the traditional height sensor, but also saves a large amount of calibration work.

4. The high-precision vehicle axle load calculation provides a feasible solution to the overload problem of the commercial vehicle.

5. The integrated ECU has high modularization degree, small occupied space and simple and reliable installation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an intelligent electrically controlled air suspension system for a commercial vehicle according to the present invention.

Fig. 2 is a schematic diagram of the air circuit in the intelligent electrically controlled air suspension system for commercial vehicles according to the present invention.

Fig. 3 is a schematic diagram of the integrated ECU of the present invention for use in an intelligent electronically controlled air suspension system for a commercial vehicle.

Fig. 4 is a schematic view of a mounting structure of a conventional height sensor.

Fig. 5 is a schematic view showing the installation of the triad sensor of the intelligent electrically controlled air suspension system for commercial vehicles according to the present invention.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

Referring to fig. 1, the intelligent electronically controlled air suspension system for commercial vehicle shown in the figure mainly includes an integrated ECU1, an air compressor 2, 4 sets of three-in-one sensors 3, 4 sets of rigidity variable air springs 4, and an air storage tank 8.

Every trinity sensor 3 is formed by range sensor, baroceptor and temperature sensor set, is fixed in on the gasbag upper cover 4a of the variable air spring 4 of rigidity (see fig. 5) through the form of screw thread, and wholly CAN reach IP6K 9K's protection level, 4 trinity sensors 3 of group, through CAN16 and waterproof connector all the way and integrated ECU's signal input part be connected.

The distance measuring sensor adopts an ultrasonic principle to measure distance and is used for monitoring the height change of the air bag so as to reflect the height change of the vehicle body. The air pressure sensor adopts a back air inlet absolute pressure sensor and is used for monitoring the air pressure value of an air bag in the rigidity-variable air spring. The temperature sensor is a pulse digital temperature sensor and is used for monitoring the internal temperature of the rigidity-variable air spring in real time.

When the height of the air spring with variable rigidity 4 changes, the corresponding three-in-one sensor 3 detects the height change signal of the air spring with variable rigidity 4 by using the ultrasonic principle and feeds the height change signal back to the integrated ECU1, and the integrated ECU1 adjusts the height of the air spring with variable rigidity 4 according to the height change signal and the control program of the integrated ECU. Besides the height signal, the integrated ECU1 also collects the air pressure and temperature of the air bag in the rigidity-variable air spring 4 through the air pressure sensor and the temperature sensor in the three-in-one sensor 3, collects the air pressure value of the air storage tank 8 through the pressure sensor, and receives the speed, door signal, engine signal and the like of the whole vehicle through CAN communication. And finally, the integrated ECU1 integrates all input signals, makes the most reasonable action according to the control logic of the integrated ECU, and finally realizes the adjustment of the height of the vehicle body and the control of the rigidity of the air bag.

The integrated ECU1 is also connected with a height adjusting button 7 through a wire harness 6, the button 7 is provided with an LED display lamp 7a, and a user adjusts the height of the vehicle body through the button 7 and judges the height state of the vehicle and the system fault according to the LED display lamp 7 a.

Referring to fig. 2, the air circuit in the intelligent electronically controlled air suspension system for commercial vehicles of the present invention is composed of an air compressor 2, an air dryer 9, a throttle valve 10, an exhaust solenoid valve 11, a left front airbag solenoid valve 5a, a right front airbag solenoid valve 5b, a left rear airbag solenoid valve 5c, a right rear airbag solenoid valve 5d, an air tank solenoid valve 5e, a left front airbag 6a, a right front airbag 6b, a left rear airbag 6c, a right rear airbag 6d, a control circuit board 12, an air tank 8, a muffler 13, an air cleaner 14, and a pressure sensor 15. The left front airbag electromagnetic valve 5a, the right front airbag electromagnetic valve 5b, the left rear airbag electromagnetic valve 5c, the right rear airbag electromagnetic valve 5d, the air storage tank electromagnetic valve 5e and the control circuit board 12 are integrated on the integrated ECU1, so that no external pin is arranged.

The left front airbag 6a, the right front airbag 6b, the left rear airbag 6c, and the right rear airbag 6d are respectively communicated with an outlet of the gas tank 8 through a left front airbag solenoid valve 5a, a right front airbag solenoid valve 5b, a left rear airbag solenoid valve 5c, a right rear airbag solenoid valve 5d, and a gas supply line.

An inlet of the air tank 8 is connected to the air compressor 2 through an air tank solenoid valve 5e, an air dryer 9, a throttle valve 10, a muffler 13, an air cleaner 14, and a pressure sensor 15, and a pipe.

When the control circuit board 12 in the integrated ECU1 determines that the front left airbag 6a needs to be inflated, the system will first determine whether the air pressure of the air tank 8 is sufficient through the pressure sensor 15, if the air pressure of the air tank 8 is sufficient, the air tank 8 is preferentially used for air inflation, the air tank solenoid valve 5e is firstly opened, and then the front left airbag solenoid valve 5a is opened, so as to replenish the air in the air tank 8 to the front left airbag 6 a. If the air pressure in the air tank 8 is insufficient, the air bag is inflated by the air compressor 2. Firstly, the air compressor 2 is started, after the air compressor 2 works, outside air enters the air compressor 2 through the air filter 14 and is compressed to high pressure, and then the left front air bag electromagnetic valve 5a is opened, so that high-pressure air generated by the air compressor 2 is supplied to the left front air bag 6 a. When the air pressure of the air storage tank 8 is insufficient and the air inflation requirement is not met, the system can open the air compressor 2, then open the electromagnetic valve 5e of the air storage tank, and use the air compressor 2 to supply air to the air storage tank 8.

Similarly, when the control circuit board 12 in the integrated ECU1 determines that the left front airbag 6a needs to be deflated, the system opens the left front airbag solenoid valve 5a first and then opens the exhaust solenoid valve 11, so that the air in the left front airbag 6a is exhausted to the air through the muffler 13 and the air cleaner 14.

Referring to fig. 3, the integrated ECU1 of the commercial vehicle intelligent air suspension electric control system of the present invention includes two CAN, wherein one CAN is an internal communication CAN16, and is mainly used for transmitting three-in-one sensor 3 signals and upper computer signals. And the other path is a finished vehicle communication CAN17 which is mainly used for interacting with a finished vehicle to acquire required finished vehicle signals and sending related information of the electric control air suspension system.

The four-way built-in electromagnetic valves 18 are respectively connected between an air bag air chamber and a piston air chamber of an air bag in the corresponding rigidity variable air spring 4 and used for controlling rigidity of the air bag, the four-way built-in electromagnetic valves 18 are connected with the integrated ECU1 through control wiring harnesses, and the integrated ECU1 controls on-off of the four-way built-in electromagnetic valves 18 to achieve communication and blocking between the air bag air chamber and the piston air chamber so as to achieve a rigidity adjusting function.

The relay of the air compressor 2 and the exhaust solenoid valve 11 are used to realize the air charging and discharging of the stiffness variable air spring 4. The pressure sensor 15 is used to monitor the air pressure of the air reservoir 8. The key 7 input and LED light display 7a are used to adjust the body height and display the vehicle height status and system faults.

Referring to fig. 4, the conventional height sensor 19 is mounted on the vehicle body 20, which is troublesome in the mounting process; meanwhile, the traditional height sensor 19 is connected with the vehicle body 20 through the swing rod 21, and the deviation of the installation position is easy to bring large errors, so that the traditional height sensor 19 is inevitably subjected to complicated calibration work after being installed.