CN112477542A - Three-wire type air suspension vehicle body height sensor and vehicle body height control method - Google Patents

Three-wire type air suspension vehicle body height sensor and vehicle body height control method Download PDF

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Publication number
CN112477542A
CN112477542A CN202011371993.5A CN202011371993A CN112477542A CN 112477542 A CN112477542 A CN 112477542A CN 202011371993 A CN202011371993 A CN 202011371993A CN 112477542 A CN112477542 A CN 112477542A
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Prior art keywords
vehicle body
height
air suspension
delta
body height
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CN202011371993.5A
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Inventor
袁春元
王兴宸
潘秀杰
王传晓
臧国任
王新彦
李国超
李忠国
李纯金
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Jiangsu University of Science and Technology
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Jiangsu University of Science and Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G17/00—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load
    • B60G17/015—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements
    • B60G17/019—Resilient suspensions having means for adjusting the spring or vibration-damper characteristics, for regulating the distance between a supporting surface and a sprung part of vehicle or for locking suspension during use to meet varying vehicular or surface conditions, e.g. due to speed or load the regulating means comprising electric or electronic elements characterised by the type of sensor or the arrangement thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2202/00—Indexing codes relating to the type of spring, damper or actuator
    • B60G2202/10—Type of spring
    • B60G2202/15—Fluid spring
    • B60G2202/152—Pneumatic spring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60G—VEHICLE SUSPENSION ARRANGEMENTS
    • B60G2500/00—Indexing codes relating to the regulated action or device
    • B60G2500/30—Height or ground clearance

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vehicle Body Suspensions (AREA)

Abstract

The invention discloses a three-wire type air suspension vehicle body height sensor and a vehicle body height control method. When the air suspension vehicle dynamically travels, the height between the vehicle body and the vehicle axle is changed, so that the connecting rod and the swing arm which are installed on the height sensors between the vehicle body and the vehicle axle can generate relative motion, the rotating shaft drives the poking needle to drive the sliding contact to slide along the annular resistance sheet, the voltage signal used for representing the height of the vehicle body is changed along with the sliding contact, and the voltage signal is transmitted to the air suspension controller in real time through the output port.

Description

Three-wire type air suspension vehicle body height sensor and vehicle body height control method
Technical Field
The invention relates to a vehicle suspension technology, in particular to a three-wire type air suspension vehicle body height sensor and a vehicle body height control method.
Background
With the improvement of the living standard of people and the rapid development of automobile technology, various travel requirements of people can be met for important vehicles and automobiles. The air suspension has the characteristics of S-shaped nonlinear rigidity characteristic, low natural frequency, active control of height and the like, and can greatly improve the comprehensive performance of the automobile, so that the design, research, application and development of the air suspension become hot problems in the industry.
Compared with the traditional suspension, the air suspension has the advantages that the height of the air suspension body is realized by reducing or increasing the gas volume in the air spring by controlling the working states of the inflation and deflation electromagnetic valves, and then the heights of the four air suspensions, namely the front air suspension, the rear air suspension, the left air suspension, the right air suspension and the like, are cooperatively controlled, so that the chassis has the proper height and smaller roll angle and pitch angle, and the comprehensive performance of the vehicle can be directly determined by accurately detecting the height of the suspension. The existing common photoelectric coupling air suspension height sensor has the defects of indirect measurement, complex judgment rule and the like, and the system is difficult to control and respond in real time. A technical solution capable of solving the drawback is developed in view of the above-mentioned problems.
Disclosure of Invention
The invention aims to overcome the defects of the existing air suspension height sensor and provides a three-wire air suspension vehicle body height sensor. The specific scheme is as follows:
the utility model provides a three-wire type air suspension automobile body height sensor, including the drain pan, the contact shift fork, swing arm revolving axle and swing arm, a serial communication port, the cavity that drain pan and upper cover constitute, annular resistance card is installed in the cavity, sliding contact has been arranged to the cavity upper end, sliding contact can slide along annular resistance card under the contact shift fork is ordered, the other end of contact shift fork is fixed in on the swing arm revolving axle, the both ends of swing arm revolving axle are installed respectively in the centre bore department of drain pan and upper cover, the rotation of swing arm revolving axle depends on the motion of swing arm, connecting rod one side is the main aspects, one side is the tip, the connecting rod tip is connected to the other end of swing arm, the base is.
The three-wire air suspension body height sensor IO port comprises a voltage stabilizing power port, an output signal port and a grounding port.
The improved structure is characterized in that the upper end of the annular resistance disc is connected with a regulated power supply port through a lead, the lower end of the annular resistance disc is connected with the ground port through a lead, and an output signal port is connected with the sliding contact through a lead.
The further improvement lies in that the port of the stabilized voltage power supply is externally connected with a 5V power supply, the grounding port is externally connected with a bonding of the vehicle body, and the output signal port is externally connected with an air suspension system controller.
In a further development, the bottom shell is mounted to the vehicle body, the base resting on the longitudinal arm of the air suspension.
The further improvement is that when the height of the air suspension vehicle body is 0, the corresponding output signal voltage is 0V; maximum height hfullThe corresponding output voltage is 5V; air suspension vehicle body height hfactThe output signal voltage V is 5 × hfact÷hfull。
A three-wire air suspension vehicle body height control method is characterized by comprising an air suspension vehicle body height lifting control method and a vehicle body height maintaining control method:
the method for controlling the height of the vehicle body to rise and fall is characterized in that n levels of vehicle body heights are set according to engineering requirements, namely, voltage corresponding to each level of vehicle body height is set
Figure BDA0002807000650000031
When the vehicle body needs to be lifted, the controller inputs the height voltage of the vehicle body according to the target gear
Figure BDA0002807000650000032
Voltage corresponding to the current gear of vehicle body height
Figure BDA0002807000650000033
Calculating the difference to obtain the deviation between the two
Figure BDA0002807000650000034
And carrying out judgment decision according to the delta V ' symbol, if the delta V ' is more than 0, outputting a PWM pulse width command of an inflation electromagnetic valve by a controller, and then increasing the height of the vehicle body until the delta V ' is 0; if it is
Figure BDA0002807000650000035
The controller outputs a pulse width command PWM of the air bleeding electromagnetic valve, and the height of the vehicle body is then reduced until delta V' is equal to 0;
a control method for maintaining the height of car body unchanged features that when the height of car body is deviated from original height position due to the increase or decrease of goods or passengers, the insensitive voltage delta V is setdisableAccording to the output voltage of the sensor and the height voltage of the original vehicle
Figure BDA0002807000650000036
Deviation Δ V of (d); and making a judgment decision according to the delta V symbol if delta V is more than delta VdisableWhen the height of the vehicle body is larger than the original height and exceeds the insensitive area, outputting a Pulse Width Modulation (PWM) pulse width command of the air discharge electromagnetic valve, and descending the vehicle body until the original height is recovered; (2) delta V is less than or equal to | Delta V |disableMaintaining the current situation unchanged and not outputting a control command; (3) DeltaV < -DeltaVdisableAnd outputting a PWM pulse width command of the inflation solenoid valve when the height of the vehicle body is smaller than the original height and exceeds the insensitive range, and lifting the vehicle body until the original height is recovered.
Compared with the prior art, the beneficial effects of this scheme lie in:
1. the three-wire type air suspension vehicle body height sensor provided by the invention has the advantages of simple structure, convenience in installation and simplicity and convenience in operation;
2. the air suspension height and the output voltage of the sensor are in an explicit linear function relationship, so that the detection precision can be greatly improved, and the sampling time can be shortened;
3. any n gears or stepless adjustment of the vehicle body height can be set according to the engineering requirement, and the adjustment range of the vehicle body height of the air suspension is further widened.
Drawings
FIG. 1 is a schematic diagram of a three-wire air suspension body height sensor configuration;
FIG. 2 is a schematic view of a three-wire air suspension body height sensor IO port;
FIG. 3 is a three-wire air suspension body height sensor circuit diagram;
FIG. 4 is a three-wire air suspension body height sensor output characteristic;
FIG. 5 is a view of the air suspension at a position where the height of the vehicle body is greater than the original static equilibrium position;
FIG. 6 is a view of the air suspension with the vehicle body height less than the original static equilibrium position;
FIG. 7 is a flow chart of an air suspension body height control system;
the device comprises a base shell 1, a ring-shaped resistor disc 2, a contact shifting fork 3, a sliding contact 4, a swing arm rotating shaft 5, a voltage stabilizing power supply port 6, an output signal port 7, a grounding port 8, a swing arm 9, a connecting rod 10, a base 11, an upper cover 12, a vehicle body 13, an air suspension longitudinal arm 14 and a grounding iron 15.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely illustrative of some, but not all, of the presently preferred embodiments of the invention, and that the present invention is best described in the specification. This invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present disclosure is set forth in order to provide a more thorough understanding thereof. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
The embodiment is combined with the attached figure 1, the three-wire type air suspension vehicle body height sensor comprises a bottom shell 1, a contact shifting fork 3, a swing arm rotating shaft 5 and a swing arm 9, wherein a cavity is formed by the bottom shell 1 and an upper cover 12, an annular resistor disc 2 is installed in the cavity, a sliding contact 4 is arranged at the upper end of the cavity, the sliding contact 4 can slide along the annular resistor disc 2 under the driving of the contact shifting fork 3, the other end of the contact shifting fork 3 is fixed on the swing arm rotating shaft 5, two ends of the swing arm rotating shaft 5 are respectively installed at central holes of the bottom shell 1 and the upper cover 12, the rotation of the swing arm rotating shaft 5 depends on the movement of the swing arm 9, one side of a connecting rod 10 is a big end, the other end of the swing arm 9 is connected with the. The upper end of the annular resistance disc 2 is connected with a regulated power supply port 6 through a lead, the lower end of the annular resistance disc 2 is connected with a grounding port 8 through a lead, and an output signal port 7 is connected with the sliding contact 4 through a lead. The bottom shell 1 is arranged on a frame, and is connected with the lower end of a connecting rod 10 and a base placed on a trailing arm of the air suspension.
Fig. 2 is a diagram of an air suspension body height sensor three-wire IO port including a regulated power supply port 6, an output signal port 7, and a ground port 8.
FIG. 3 is an external circuit diagram of the air suspension body height sensor, in which a regulated power supply port 6 is externally connected with a 5V power supply, and a grounding port 8 is externally connected with a bonding 15 of a body; the output signal port 7 is externally connected with an air suspension system controller (ECU).
FIG. 4 is a graph showing the output signal voltage characteristics of the air suspension body height sensor, i.e., the corresponding output signal voltage is 0V when the air suspension body height is 0; maximum height hfullThe corresponding output signal voltage is 5V; air suspension vehicle body height hfactIf the output signal voltage V is 5 × hfact÷hfull。
Fig. 5 and 6 are respectively an air suspension vehicle body height higher diagram and a vehicle body height lower diagram, and fig. 7 is a diagram of an air suspension vehicle body height control system. The three-wire air suspension vehicle body height control method includes air suspension vehicle body height raising and lowering control method and vehicle body height maintaining control method. The vehicle body height lifting control method can set n vehicle body heights according to engineering requirements, namely, the voltage corresponding to each vehicle body height is set
Figure BDA0002807000650000061
When the vehicle body needs to be lifted, the controller inputs the height voltage of the vehicle body according to the target gear
Figure BDA0002807000650000062
Voltage corresponding to the current gear of vehicle body height
Figure BDA0002807000650000063
Calculating the difference to obtain the deviation between the two
Figure BDA0002807000650000064
And making a judgment decision according to the delta V' symbol: if delta V 'is greater than 0, the controller outputs a PWM pulse width command of the inflation electromagnetic valve, and the height of the vehicle body rises until delta V' is 0; if it is
Figure BDA0002807000650000065
The controller outputs a bleed solenoid valve PWM pulse width command and the body height then decreases until Δ V' is 0.
Control for keeping height of vehicle body unchangedThe method is characterized in that the insensitive voltage delta V is set when the height of the vehicle body deviates from the original height position due to the increase and decrease of goods or passengers and the vehicle body height is recovereddisableAccording to the output voltage of the sensor and the height voltage of the original vehicle
Figure BDA0002807000650000066
Deviation Δ V of (d); and making a judgment decision according to the delta V symbol: if Δ V > Δ VdisableWhen the height of the vehicle body is larger than the original height and exceeds the insensitive area, outputting a Pulse Width Modulation (PWM) pulse width command of the air discharge electromagnetic valve, and descending the vehicle body until the original height is recovered; (2) delta V is less than or equal to | Delta V |disableMaintaining the current situation unchanged and not outputting a control command; (3) DeltaV < -DeltaVdisableAnd outputting a PWM pulse width command of the inflation solenoid valve when the height of the vehicle body is smaller than the original height and exceeds the insensitive range, and lifting the vehicle body until the original height is recovered.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments described above. All equivalent structures made by using the content of the specification of the invention can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the invention.

Claims (7)

1. A three-wire air suspension vehicle body height sensor comprises a bottom shell (1), a contact shifting fork (3), a swing arm rotating shaft (5) and a swing arm (9), the device is characterized by comprising a cavity formed by a bottom shell (1) and an upper cover (12), wherein an annular resistance card (2) is arranged in the cavity, a sliding contact (4) is arranged at the upper end of the cavity, the sliding contact (4) can slide along the annular resistance card (2) under the driving of a contact shifting fork (3), the other end of the contact shifting fork (3) is fixed on a swing arm rotating shaft (5), two ends of the swing arm rotating shaft (5) are respectively arranged at central holes of the bottom shell (1) and the upper cover (12), the rotation of the swing arm rotating shaft (5) depends on the movement of a swing arm (9), one side of a connecting rod (10) is a big end, the other end of the swing arm (9) is connected with a small end of the connecting rod (10), and a base (11) is connected with the big end of the.
2. The three-wire air suspension body height sensor according to claim 1, further comprising a three-wire air suspension body height sensor IO port comprising a regulated power supply port (6), an output signal port (7) and a ground port (8).
3. Three-wire air suspension body height sensor according to claim 2, wherein the upper end of the annular resistive sheet (2) is connected to the regulated power supply port (6) by a wire, the lower end of the annular resistive sheet (2) is connected to the ground port (8) by a wire, and the output signal port (7) is connected to the sliding contact (4) by a wire.
4. A three-wire air suspension body height sensor according to claim 3, wherein the regulated power port (6) is externally connected with a 5V power supply, the grounding port (8) is externally connected with a body grounding (15), and the output signal port (7) is externally connected with an air suspension system controller.
5. Three-wire air suspension body height sensor according to claim 4, wherein the bottom shell (1) is mounted to the body (13), the base (11) resting on the longitudinal arms (14) of the air suspension.
6. The three-wire air suspension vehicle body height sensor according to claim 5, wherein the corresponding output signal voltage is 0v when the air suspension vehicle body height is 0; maximum height hfullThe corresponding output voltage is 5V; air suspension vehicle body height hfactThe output signal voltage V is 5 × hfact÷hfull。
7. A three-wire air suspension vehicle body height control method is characterized by comprising an air suspension vehicle body height lifting control method and a vehicle body height maintaining control method:
the method for controlling the height of the vehicle body to rise and fall is characterized in that n levels of vehicle body heights are set according to engineering requirements, namely, voltage corresponding to each level of vehicle body height is set
Figure FDA0002807000640000021
When the vehicle body needs to be lifted, the controller inputs the height voltage of the vehicle body according to the target gear
Figure FDA0002807000640000022
Voltage corresponding to the current gear of vehicle body height
Figure FDA0002807000640000023
Calculating the difference to obtain the deviation between the two
Figure FDA0002807000640000024
And carrying out judgment decision according to the delta V ' symbol, if the delta V ' is more than 0, outputting a PWM pulse width command of an inflation electromagnetic valve by a controller, and then increasing the height of the vehicle body until the delta V ' is 0; if the delta V 'is less than 0, the controller outputs a PWM pulse width command of the air bleeding electromagnetic valve, and the height of the vehicle body is then reduced until the delta V' is equal to 0;
a control method for maintaining the height of car body unchanged features that when the height of car body is deviated from original height position due to the increase or decrease of goods or passengers, the insensitive voltage delta V is setdisableAccording to the output voltage of the sensor and the height voltage of the original vehicle
Figure FDA0002807000640000025
Deviation Δ V of (d); and making a judgment decision according to the delta V symbol if delta V is more than delta VdisableWhen the height of the vehicle body is larger than the original height and exceeds the insensitive area, outputting a Pulse Width Modulation (PWM) pulse width command of the air discharge electromagnetic valve, and descending the vehicle body until the original height is recovered; (2) delta V is less than or equal to | Delta V |disableMaintaining the current situation unchanged and not outputting a control command; (3) DeltaV < -DeltaVdisableAnd outputting a PWM pulse width command of the inflation solenoid valve when the height of the vehicle body is smaller than the original height and exceeds the insensitive range, and lifting the vehicle body until the original height is recovered.
CN202011371993.5A 2020-11-30 2020-11-30 Three-wire type air suspension vehicle body height sensor and vehicle body height control method Pending CN112477542A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201352107Y (en) * 2008-10-24 2009-11-25 江苏大学 Air suspension bus body height detecting system
CN201473281U (en) * 2009-07-14 2010-05-19 无锡大隆电工机械厂 Safe operation alarm system of pallet stacking truck
CN201974216U (en) * 2011-01-30 2011-09-14 南京艾驰电子科技有限公司 Oil level sensor
CN104960396A (en) * 2015-07-08 2015-10-07 吉林大学 Whole-vehicle height control method based on electric-control air hanging bracket adopting layered structure
CN110949084A (en) * 2019-12-06 2020-04-03 珠海格力电器股份有限公司 Height detection structure, assembling method, vehicle suspension system and vehicle
CN111422017A (en) * 2019-12-26 2020-07-17 扬子江汽车集团有限公司 Automobile air suspension control system and method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201352107Y (en) * 2008-10-24 2009-11-25 江苏大学 Air suspension bus body height detecting system
CN201473281U (en) * 2009-07-14 2010-05-19 无锡大隆电工机械厂 Safe operation alarm system of pallet stacking truck
CN201974216U (en) * 2011-01-30 2011-09-14 南京艾驰电子科技有限公司 Oil level sensor
CN104960396A (en) * 2015-07-08 2015-10-07 吉林大学 Whole-vehicle height control method based on electric-control air hanging bracket adopting layered structure
CN110949084A (en) * 2019-12-06 2020-04-03 珠海格力电器股份有限公司 Height detection structure, assembling method, vehicle suspension system and vehicle
CN111422017A (en) * 2019-12-26 2020-07-17 扬子江汽车集团有限公司 Automobile air suspension control system and method

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