CN112477541A - Four-wire type air suspension vehicle body height sensor and vehicle body height control method - Google Patents
Four-wire type air suspension vehicle body height sensor and vehicle body height control method Download PDFInfo
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- CN112477541A CN112477541A CN202011371891.3A CN202011371891A CN112477541A CN 112477541 A CN112477541 A CN 112477541A CN 202011371891 A CN202011371891 A CN 202011371891A CN 112477541 A CN112477541 A CN 112477541A
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- air suspension
- vehicle body
- height
- voltage
- swing arm
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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 four-wire type air suspension vehicle body height sensor and a vehicle body height control method, which comprises a bottom shell, a swing arm rotating shaft, a connecting rod and an upper cover, wherein a cavity is formed by the bottom shell and the upper cover, an annular resistance sheet is arranged in the cavity, a low-level alarm switch and a sliding contact are arranged in the cavity, a rotary shifting fork drives the sliding contact to enable the sliding contact to slide back and forth along the annular resistance sheet, the rotary shifting fork and the swing arm are respectively fixed with the swing arm rotating shaft, the swing arm is connected with the small end of the connecting rod, and the large end of the connecting rod is connected with a base. When the air suspension vehicle dynamically runs, the height between the vehicle body and the vehicle axle is changed, so that the connecting rod of the height sensor and the swing arm arranged between the vehicle body and the vehicle axle can generate relative motion, the swing arm rotating shaft drives the poking needle to drive the sliding contact to slide along the annular resistor disc, and the signal output port is used for representing the real-time change of a voltage signal of the vehicle body height. An input signal will be provided for the air suspension controller to monitor or adjust the body height in real time.
Description
Technical Field
The invention relates to a vehicle suspension technology, in particular to a four-wire 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 conventional photoelectric coupling air suspension height sensor has the defects that indirect measurement and complex judgment rule exist, a system is difficult to control and respond in real time, and a technical scheme capable of solving the defects is developed aiming at the problems.
Disclosure of Invention
The invention aims to overcome the defects of the existing air suspension height sensor and provides a four-wire air suspension vehicle body height sensor and a vehicle body height control method. The specific scheme is as follows:
the utility model provides a four-wire type air suspension automobile body height sensor, including the drain pan, the swing arm revolving axle, rotatory shift fork, connecting rod and upper cover, a serial communication port, the cavity that drain pan and upper cover constitute, annular resistance card installs in the cavity, low level alarm switch and sliding contact have been arranged in the cavity, rotatory shift fork drive sliding contact makes sliding contact can make a round trip to slide along annular resistance card, the centre bore department at drain pan and upper cover is installed respectively at the both ends of swing arm revolving axle, rotatory shift fork and swing arm are fixed with the swing arm revolving axle respectively, connecting rod one side is the tip setting, the opposite side is the main aspects setting, the swing arm is connected with the tip of connecting rod, the main aspects and the base of connecting rod are connected.
The improved structure of the low-level alarm switch is characterized by further comprising a grounding port, a low-level alarm port, a signal output port and a voltage-stabilizing power port, wherein the voltage-stabilizing power port is connected to the upper end of the annular resistance sheet through a conducting wire, the grounding port is connected to the lower end of the annular resistance sheet through a conducting wire, the signal output port is connected with the sliding contact through a conducting wire, and the low-level alarm port is connected with the low-level alarm switch (6) through a conducting wire.
The improved structure is characterized in that a 5V stabilized voltage power supply is externally connected to a port of the stabilized voltage power supply, an air suspension controller is externally connected to a signal output port, a grounding port is externally connected to a vehicle body ground, and an alarm lamp and a 12V alarm power supply are externally connected to a low-level alarm port.
The further improvement is that the bottom shell is arranged on the air suspension frame, and the base is placed on the longitudinal arm of the air suspension frame.
The further improvement is that when the height of the air suspension vehicle body is 0, the signal output voltage is 0V, and the maximum height h of the air suspension vehicle body is 0fullCorresponding to signal output voltage of 5V and air suspension height hfactWhen the voltage V is 5 × h, the signal output voltage V is set to be equal tofact÷hfullVolts.
A control method for the height of a four-wire air suspension vehicle body is characterized by comprising an air suspension vehicle body height lifting control method and an air suspension vehicle body height maintaining method;
the air suspension vehicle body height lifting control method sets n levels of air suspension vehicle body heights according to engineering design requirements, and each level of corresponding reference voltage
When the air suspension chassis needs to be lifted, the controller inputs the target gear height voltage
Voltage of current gear height
Comparing to obtain deviation
(1) If delta V 'is greater than 0, outputting a PWM pulse width command of an inflation electromagnetic valve, and reducing the height of the air suspension until the delta V' is equal to 0;
(2) if it is
Outputting a pulse width command of a deflation electromagnetic valve PWM, and increasing the height of the air suspension body until the air suspension body meets the condition that delta V' is 0;
the air suspension vehicle body height maintaining constant control method is to set an insensitive voltage delta VdisableThe deviation DeltaV of the sensor output voltage from the reference voltage,
(1)ΔV＞ΔVdisablethe height of the air suspension vehicle body is greater than the reference height and exceeds the error range, the air suspension vehicle body needs to be lowered to recover the reference height, and an air release instruction is output;
(2)|ΔV|≤ΔVdisablemaintaining the current situation unchanged and not outputting a control command;
(3)ΔV＜-ΔVdisableand when the height of the air suspension vehicle body is smaller than the reference height and exceeds the error range, the air suspension vehicle body needs to be raised to restore the reference height, and the controller outputs a pulse width command PWM of the inflation electromagnetic valve.
Compared with the prior art, the beneficial effects of this scheme lie in:
1. the four-wire type air suspension vehicle body height sensor has the advantages of simple structure, convenience in installation and easiness in implementation;
2. the invention converts the air suspension vehicle body height control problem into the linear voltage control problem, and can reduce the development difficulty of the air suspension electronic controller;
3. the structure of the invention gives consideration to the step n-gear adjustment or the stepless adjustment of the height of the air suspension vehicle body, and the adjustment can be realized only by modifying a control program.
Drawings
FIG. 1 is a schematic structural view of a four-wire air suspension body height sensor;
FIG. 2 is a four-wire IO port diagram;
FIG. 3 is a view of the sliding contact in a normal operating position;
FIG. 4 is a graph of vehicle body height sensor signal output voltage characteristics;
FIG. 5 is a low alarm line diagram of a four-wire sensor;
FIG. 6 is a schematic view of the air suspension body height being greater than the target height;
FIG. 7 is a schematic view of the air suspension body height being less than the target height;
FIG. 8 is a flow chart of an air suspension body height control system;
the device comprises a base shell 1, an annular resistance sheet 2, a swing arm rotating shaft 3, a rotary shifting fork 4, a sliding contact 5, an alarm switch 6, a base 7, a connecting rod 8, a swing arm 9, a grounding port 10, a low-level alarm port 11, a signal output port 12, a voltage-stabilizing power port 13, an upper cover 14 and a grounding strap 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 four-wire type air suspension vehicle body height sensor comprises a bottom shell 1, a swing arm rotating shaft 3, a rotary shifting fork 4, a connecting rod 8 and an upper cover 14, wherein a cavity is formed by the bottom shell 1 and the upper cover 14, an annular resistor disc 2 is arranged in the cavity, a low-level alarm switch 6 and a sliding contact 5 are arranged on the cavity, the rotary shifting fork 4 is of a double-fork structure, a left-side fork is connected with the sliding contact 5, the driving sliding contact 5 can slide back and forth along the annular resistor disc 2, and a right-side fork can touch the low-level alarm switch 11 when the vehicle body is at a low level so as to close the low-level alarm switch 11; two ends of the swing arm rotating shaft 3 are respectively installed at central holes of the bottom shell 1 and the upper cover 14, the rotary shifting fork 4 and the swing arm 9 are respectively fixed with the swing arm rotating shaft 3, one side of the connecting rod 8 is arranged at a small end, the other side of the connecting rod is arranged at a large end, the swing arm 9 is connected with the small end of the connecting rod 8, and the large end of the connecting rod 8 is connected with the base 7. The high-voltage and low-voltage protection device is characterized by further comprising a grounding port 10, a low-level alarm port 11, a signal output port 12 and a voltage-stabilized power supply port 13, wherein the voltage-stabilized power supply port 13 is connected to the upper end of the annular resistance sheet 2 through a conducting wire, the grounding port 10 is connected to the lower end of the annular resistance sheet 2 through a conducting wire, the signal output port 12 is connected with the sliding contact 5 through a conducting wire, and the low-level alarm port 11 is connected with the low-.
Fig. 2 is a diagram of an IO port of a four-wire air suspension vehicle body height sensor, which includes a ground port 10, a low-level alarm port 11, a signal output port 12 and a regulated power supply port 13, the regulated power supply port 13 is externally connected with a 5V regulated power supply, the signal output port 12 is externally connected with an air suspension controller (hereinafter referred to as ECU), the ground port 10 is externally connected with a vehicle body ground 15, the low-level alarm port 11 is externally connected with an alarm lamp and a 12V alarm power supply, a bottom shell 1 is installed on an air suspension vehicle frame, and a base 7 is placed on a longitudinal arm of the air suspension.
Fig. 3 and 4 are respectively a normal range of the sliding contact of the air suspension height sensor and an output characteristic thereof, and when the vehicle height is 0, the signal output voltage is 0V; and a maximum vehicle body height hfullThe corresponding signal output voltage is 5V; air suspension height hfactSignal output power V-5 × hfact÷hfullVolts.
Fig. 5 shows that when the height of the air suspension vehicle body is 0, the low-level alarm switch is closed, the 12V stabilized power supply, the alarm lamp and the vehicle body ground form a closed loop, and the low-level alarm lamp is turned on.
Fig. 6 and 7 are respectively a high-altitude diagram and a low-altitude diagram of the air suspension body. Fig. 8 is a diagram of an air suspension body height control system. In order to keep the height of the air suspension vehicle body constant, the specific control method comprises the following steps: setting an insensitive Voltage Δ VdisableThe deviation amount between the current output voltage of the height sensor and the voltage of the previous sampling period is Δ V, if (1) Δ V > Δ VdisableWhen the height of the air suspension vehicle body is larger than the reference height and exceeds the error range, the air suspension vehicle body needs to be lowered to recover the reference height, and a PWM pulse width instruction of an air bleeding electromagnetic valve is output; if (2) | delta V | < delta V |disableMaintaining the current situation unchanged and not outputting a control command; if (3) Δ V < -. DELTA.VdisableAnd when the height of the air suspension vehicle body is smaller than the target height and exceeds the error range, the air suspension vehicle body needs to be raised to recover the target height, and the controller outputs a PWM pulse width command of the inflation electromagnetic valve.
Further, the air suspension vehicle body height lifting control method comprises the following steps: n grades of air suspension body heights can be set according to engineering requirements, and corresponding reference voltage of each grade of body height
When the air suspension chassis needs to be lifted, the controller inputs the target gear height voltage
Voltage of current gear height
Comparing to obtain deviation
And (4) judging and deciding: if delta V 'is greater than 0, outputting PWM pulse width of an inflation electromagnetic valve, and increasing the height of the air suspension until the delta V' is equal to 0; if it is
And outputting a pulse width command of a deflation electromagnetic valve PWM, and reducing the height of the air suspension body until the air suspension body meets the condition that delta V is 0.
When the air suspension vehicle dynamically runs, the height between the vehicle body and the vehicle axle is changed, so that the connecting rod of the height sensor and the swing arm arranged between the vehicle body and the vehicle axle can generate relative motion, the swing arm rotating shaft drives the poking needle to drive the sliding contact to slide along the annular resistor disc, and the signal output port is used for representing the real-time change of a voltage signal of the vehicle body height. An input signal will be provided for the air suspension controller to monitor or adjust the body height in real time.
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 (6)
1. A four-wire air suspension vehicle body height sensor comprises a bottom shell (1), a swing arm rotating shaft (3), a rotary shifting fork (4), a connecting rod (8) and an upper cover (14), and is characterized in that the bottom shell (1) and the upper cover (14) form a cavity, an annular resistance sheet (2) is arranged in the cavity, a low alarm switch (6) and a sliding contact (5) are arranged in the cavity, the rotary shifting fork (4) is of a double-fork structure, a left side fork is connected with the sliding contact (5), so that the sliding contact (5) can slide along the circumference of the annular resistance sheet, two ends of the swing arm rotating shaft (3) are respectively arranged at central holes of the bottom shell (1) and the upper cover (14), the rotary shifting fork (4) and a swing arm (9) are respectively fixed with the swing arm rotating shaft (3), one side of the connecting rod (8) is provided with a small end, the other side is provided with a large end, and the swing arm (9) is, the big end of the connecting rod (8) is connected with the base (7).
2. The four-wire air suspension vehicle body height sensor is characterized by further comprising a ground port (10), a low-level alarm port (11), a signal output port (12) and a voltage-stabilized power supply port (13), wherein the voltage-stabilized power supply port (13) is connected to the upper end of the annular resistor disc (2) through a conducting wire, the ground port (10) is connected to the lower end of the annular resistor disc (2) through a conducting wire, the signal output port (12) is connected with the sliding contact (5) through a conducting wire, and the low-level alarm port (11) is connected with the low-level alarm switch (6) through a conducting wire.
3. The four-wire air suspension vehicle body height sensor as claimed in claim 2, characterized in that the voltage-stabilizing power supply port (13) is externally connected with a 5V voltage-stabilizing power supply, the signal output port (12) is externally connected with an air suspension controller, the grounding port (10) is externally connected with a vehicle body grounding (15), and the low-level alarm port (11) is externally connected with an alarm lamp and a 12V alarm power supply.
4. A four-wire air suspension body height sensor according to claim 3, wherein the bottom shell (1) is mounted to the air suspension frame and the base (7) is placed on the longitudinal arm of the air suspension.
5. The four-wire air suspension body height sensor of claim 4, wherein the air suspension body height sensorWhen the height of the vehicle body is 0, the signal output voltage is 0V, and the height h of the maximum air suspension vehicle body is 0fullCorresponding to signal output voltage of 5V and air suspension height hfactWhen the voltage V is 5 × h, the signal output voltage V is set to be equal tofact÷hfullVolts.
6. A four-wire air suspension vehicle body height control method is characterized by comprising an air suspension vehicle body height lifting control method and an air suspension vehicle body height maintaining method;
the air suspension vehicle body height lifting control method sets n levels of air suspension vehicle body heights according to engineering design requirements, and each level of corresponding reference voltage
When the air suspension chassis needs to be lifted, the controller inputs the target gear height voltage
Voltage of current gear height
Comparing to obtain deviation
(1) If delta V 'is greater than 0, outputting a PWM pulse width command of an inflation electromagnetic valve, and reducing the height of the air suspension until the delta V' is equal to 0;
(2) if the delta V 'is less than 0, outputting a PWM pulse width command of an air bleeding electromagnetic valve, and increasing the height of the air suspension vehicle body until the delta V' is equal to 0;
the air suspension vehicle body height maintaining constant control method is to set an insensitive voltage delta VdisableThe deviation DeltaV of the sensor output voltage from the reference voltage,
(1)ΔV＞ΔVdisablewhen the height of the air suspension vehicle body is larger than the reference height and exceeds the error range, the air suspension vehicle body needs to be lowered to restore the reference height, and PWM pulses of the air bleeding electromagnetic valve are outputA width command;
(2)|ΔV|≤ΔVdisablemaintaining the current situation unchanged and not outputting a control command;
(3)ΔV＜-ΔVdisableand when the height of the air suspension vehicle body is smaller than the reference height and exceeds the error range, the air suspension vehicle body needs to be raised to restore the reference height, and the controller outputs a pulse width command PWM of the inflation electromagnetic valve.
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| CN202011371891.3A CN112477541A (en) | 2020-11-30 | 2020-11-30 | Four-wire type air suspension vehicle body height sensor and vehicle body height control method |
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| CN202011371891.3A CN112477541A (en) | 2020-11-30 | 2020-11-30 | Four-wire type air suspension vehicle body height sensor and vehicle body height control method |
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Citations (6)
| 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 |
-
2020
- 2020-11-30 CN CN202011371891.3A patent/CN112477541A/en active Pending
Patent Citations (6)
| 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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Application publication date: 20210312 |