An EDR acceleration simulation device for automobile event data recording system

Abstract

The present invention provides an EDR acceleration simulation device for an automobile event data recording system, comprising a protective cover; a front support frame and a rear support frame are symmetrically arranged in the protective cover, a magnetic axis is fixed between the front support frame and the rear support frame, a linear motor is arranged on the magnetic axis, a workbench is fixed on the linear motor, an EDR controller to be tested and an external acceleration sensor are arranged on the workbench; the lower end of the protective cover is connected to a control cabinet, and an industrial computer and a driver are arranged on the control cabinet. The present invention provides an EDR acceleration simulation device for an automobile event data recording system, which adopts a motor drive form and is provided with a protective device to meet the requirements of low use cost, high safety performance and low target acceleration error.

Description

Technical Field

[0001] The invention belongs to the field of acceleration simulation, and in particular relates to an acceleration simulation device of an automobile event data recording system EDR. Background Art

[0002] With the application of EDR in vehicles, it is becoming more and more important to test the product functions of EDR controllers. Before installing the EDR controller on the vehicle, its functions need to be tested to see whether the EDR controller can monitor the main operating status of the vehicle and the driver's operating status for a period of time after the accident. Therefore, it is necessary to simulate the acceleration during the collision of the vehicle. This test can also be applied to other electronic control unit tests, such as airbag controllers (SRS).

[0003] Since the EDR controller has a built-in acceleration sensor, the acceleration sensor can be stimulated in two ways: real car and simulation device. Using real car collision test not only greatly increases the cost, but also has high risk, which greatly prolongs the development cycle of EDR controller. Therefore, most of them use simulation device at present. The existing test device is generally composed of hydraulic servo system or cylinder system, which has the disadvantages of high cost, low safety performance and large target acceleration error. Summary of the invention

[0004] In view of this, the present invention aims to propose an EDR acceleration simulation device for an automobile event data recording system. Since the servo cylinder, hydraulic pump, servo solenoid valve and other devices are relatively expensive, they do not meet the requirement of low cost; if the power source of the acceleration simulation device is driven by a cylinder system, since the laboratory has relatively high requirements for the safety level of the equipment and the cylinder will generate relatively large noise during operation, it does not meet the requirement of high safety performance; the peak acceleration error of the target acceleration generated by the hydraulic servo system and the cylinder system is about 10%-15%, so it does not meet the requirement of low target acceleration error. In summary, the EDR acceleration simulation device for an automobile event data recording system proposed by the present invention is driven by a motor and is provided with a protection device to meet the requirements of low cost, high safety performance and low target acceleration error.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] An EDR acceleration simulation device for an automobile event data recording system comprises a protective cover; a front end support frame and a rear end support frame are symmetrically arranged inside the protective cover, a magnetic axis is fixedly arranged between the front end support frame and the rear end support frame, a linear motor is arranged on the magnetic axis, a workbench is fixedly arranged on the linear motor, an EDR controller to be tested and an external acceleration sensor are arranged on the workbench; the lower end of the protective cover is connected to a control cabinet, an industrial computer and a driver are arranged on the control cabinet; the external acceleration sensor is connected to the industrial computer, the industrial computer is connected to the driver, and the driver is connected to the linear motor; a front end return spring is arranged on the front end support frame and is opposite to the workbench, and a rear end return spring is arranged on the rear end support frame and is opposite to the workbench.

[0007] In the practical application of the present invention, the EDR controller to be tested is first fixed on the workbench, and the driver is controlled by an industrial computer to finally realize the simulated motion of the linear motor on the magnetic axis with set acceleration parameters; the external acceleration sensor collects real-time acceleration data and uploads it to the industrial computer; the front return spring and the rear return spring are used to protect the linear motor when the program is abnormal.

[0008] The linear motor is a power module, which realizes the setting of acceleration, acceleration time and maximum speed through the driver. The working environment is the temperature of -40℃ to 40℃ and the relative humidity is not more than 90%.

[0009] The front return spring, the rear return spring and the protective cover all belong to the protection module, and the protective cover realizes the protection function for the operator.

[0010] The model of the external acceleration sensor is BOSCH SMA68X, which can measure a maximum acceleration of 120g and a resolution of up to 12 bits. It has an anti-momentary power failure function to reduce the acceleration measurement error caused by a brief power failure between the sensor and the power supply after a collision.

[0011] Furthermore, a slide rail platform base is provided directly below the workbench, and a left slide rail and a right slide rail arranged parallel to each other are provided on the slide rail platform base. Two grooves that cooperate with the left slide rail and the right slide rail to guide the sliding are provided on the lower surface of the workbench, and the two grooves are respectively arranged on the left and right sides of the linear motor.

[0012] The left slide rail and the right slide rail and the corresponding grooves form a linear guide mechanism to provide guidance for the movement of the workbench.

[0013] Furthermore, the linear motor includes: a shell and a coil winding; the shell is provided with an air inlet and an air outlet; the coil winding is arranged between the air inlet and the air outlet.

[0014] The circulating air enters from the air inlet and is discharged from the air outlet. The periodic entry and discharge of the circulating air can take away the heat generated during the operation of the coil, thereby reducing the temperature of the coil.

[0015] Furthermore, a groove is provided on the upper surface of the slide rail platform base relative to the shell, and a gap of 10 cm is provided between the shell and the slide rail platform base.

[0016] Furthermore, the protective cover is provided with a protective cover door.

[0017] The protective cover is made of aluminum alloy steel plate, and the protective cover door is made of acrylic plate.

[0018] Furthermore, a power status indicator light, a motor operation indicator light and a motor fault indicator light are provided on the control cabinet; the power status indicator light, the motor operation indicator light and the motor fault indicator light are respectively connected to the industrial computer.

[0019] Furthermore, the EDR controller is connected to the workbench via screws.

[0020] Furthermore, universal wheels are provided at the bottom of the control cabinet.

[0021] Furthermore, the magnetic axis includes: a seamless steel pipe and a permanent magnet, and the permanent magnet is arranged inside the seamless steel pipe.

[0022] Furthermore, the front end support frame and the rear end support frame are connected to the seamless steel pipe by screws.

[0023] Compared with the prior art, the EDR acceleration simulation device of the automobile event data recording system of the present invention has the following advantages:

[0024] The invention discloses an acceleration simulation device for an automobile event data recording system (EDR), which has the following beneficial effects: 1. The acceleration simulation device is adopted to reduce the test cost, reduce the test difficulty, and shorten the development cycle; 2. The power source is driven by a motor, and the target acceleration range generated is ±10g, and the accuracy is ±1% FS; 3. Real-time monitoring and preliminary calibration of acceleration can be realized; 4. The peripheral protection device of the acceleration simulation device meets the safety level requirements in the laboratory environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] In the attached picture:

[0027] Figure 1 This is a schematic diagram of the structure of an EDR acceleration simulation device of an automobile event data recording system according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of a linear motor of an EDR acceleration simulation device of an automobile event data recording system according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of a slide rail platform base of an EDR acceleration simulation device of an automobile event data recording system according to an embodiment of the present invention;

[0030] Figure 4 The figure is a schematic diagram of a speed-time curve of an EDR acceleration simulation device of an automobile event data recording system according to an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1-front end support frame; 2-rear end support frame; 3-linear motor; 30-housing; 31-air inlet; 32-air outlet; 4-EDR controller; 5-workbench; 51-left slide rail; 52-right slide rail; 53-slide rail carrier base; 6-external acceleration sensor; 7-magnetic axis; 8-front end return spring; 9-rear end return spring; 10-protective cover; 11-protective cover door; 12-control cabinet; 13-locking nut; 14-power status indicator light; 15-motor operation indicator light; 16-motor fault indicator light; 17-universal wheel; 18-industrial computer; 19-driver. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0037] like Figure 1-3 As shown, an EDR acceleration simulation device for an automobile event data recording system comprises a protective cover 10; a front end support frame 1 and a rear end support frame 2 are symmetrically arranged inside the protective cover 10, a magnetic axis 7 is fixedly arranged between the front end support frame 1 and the rear end support frame 2, a linear motor 3 is arranged on the magnetic axis 7, a workbench 5 is fixedly arranged on the linear motor 3, an EDR controller 4 to be tested and an external acceleration sensor 6 are arranged on the workbench 5; the lower end of the protective cover 10 is connected to a control cabinet 12, an industrial computer 18 and a driver 19 are arranged on the control cabinet 12; the external acceleration sensor 6 is connected to the industrial computer 18, the industrial computer 18 is connected to the driver 19, and the driver 19 is connected to the linear motor 3; a front end return spring 8 arranged opposite to the workbench 5 is arranged on the front end support frame 1, and a rear end return spring 9 arranged opposite to the workbench 5 is arranged on the rear end support frame 2.

[0038] like Figure 1-3 As shown, a slide rail platform base 53 is provided directly below the workbench 5, and a left slide rail 51 and a right slide rail 52 arranged parallel to each other are provided on the slide rail platform base 53. The lower surface of the workbench 5 is provided with two grooves that cooperate with the left slide rail 51 and the right slide rail 52 to guide the sliding, and the two grooves are respectively arranged on the left and right sides of the linear motor 3.

[0039] like Figure 1-3 As shown, the linear motor 3 includes: a housing 30 and a coil winding; the housing 30 is provided with an air inlet 31 and an air outlet 32; the coil winding is arranged between the air inlet 31 and the air outlet 32.

[0040] like Figure 1-3 As shown, a groove is provided on the upper surface of the slide rail platform base 53 at a position opposite to the shell 30 , and a gap of 10 cm is provided between the shell 30 and the slide rail platform base 53 .

[0041] like Figure 1-3 As shown, the protection cover 10 is provided with a protection cover door 11 .

[0042] like Figure 1-3As shown, the control cabinet 12 is provided with a power status indicator light 14 , a motor operation indicator light 15 and a motor fault indicator light 16 ; the power status indicator light 14 , the motor operation indicator light 15 and the motor fault indicator light 16 are all connected to an industrial computer 18 , respectively.

[0043] like Figure 1-3 As shown, the EDR controller 4 is connected to the workbench 5 via screws.

[0044] like Figure 1-3 As shown, a universal wheel 17 is provided at the bottom of the control cabinet 12 .

[0045] like Figure 1-3 As shown, the magnetic axis 7 includes: a seamless steel pipe and a permanent magnet, and the permanent magnet is arranged inside the seamless steel pipe.

[0046] like Figure 1-3 As shown, the front end support frame 1 and the rear end support frame 2 are both connected to the seamless steel pipe by screws.

[0047] The model of the industrial computer 18 is Advantech 610L, and the model of the driver 19 is Panasonic MADHT5310L01.

[0048] like Figure 4 As shown, the model of the external acceleration sensor 6 is BOSCH SMA68X, and the external acceleration sensor 6 is placed parallel to the direction of the magnetic axis 7. Within 150ms, when the speed change reaches 8km / h, the EDR controller 4 triggers data recording. The data before and after the collision include: vehicle speed, accelerator pedal status, engine throttle opening, engine speed, brake switch status, master cylinder pressure, longitudinal acceleration, gear status, etc. When the speed change reaches 25km / h within 150ms, the data within 5s before this moment and within 200ms after the collision will be locked and stored by the EDR controller 4, and the maximum acceleration that the linear motor 3 can achieve is 10g.

[0049] In this embodiment:

[0050] Thrust calculation formula:

[0051] F L =μ(M L +M P )

[0052]

[0053] Where μ is the friction coefficient, M L is the load mass, M P is the mass of the mover, g is the acceleration due to gravity 9.8m / s 2 ; F ef is the average effective thrust, F amax、F rmax 、F dmax They are the maximum acceleration thrust, uniform thrust, and maximum deceleration thrust, respectively, t a ,t r ,t d are the corresponding acceleration, uniform speed and deceleration times respectively.

[0054] Displacement calculation formula:

[0055] S t =∑S i =S a +S r +S d

[0056] Where S t is the total displacement, S a is the displacement in the acceleration phase, S r is the displacement in the uniform speed stage, S d is the displacement during the deceleration phase.

[0057] Acceleration time calculation formula:

[0058]

[0059] Where V m is the maximum speed, K is the safety factor, which is 1.3, and F m is the peak thrust. It can be calculated that when the trigger recording conditions are met, the speed is 2.22m / s and the acceleration time is T a1 When the lock storage condition is met, the speed is 6.94m / s, and the acceleration time is T a2 The time required by regulations to reach the speed change threshold is recorded as T am , the value is 150ms, through the above calculation, we can get: acceleration time T a1 <T a2 <T am , so the acceleration time meets the requirements.

[0060] According to the maximum acceleration time required by regulations, when the trigger data recording conditions are met, the total displacement S t is 0.554m; when the locked storage condition is met, the total displacement S t is 1.734m; when the acceleration threshold is the maximum value of 10g, the total displacement S t is 3.675m, denoted as S tmax , through the above calculation, we can get: S tmax L , so the length of the selected horizontal slide rail meets the requirements.

[0061] ​The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An EDR acceleration simulation device for an automobile event data recording system, characterized in that: The device comprises a protective cover (10); a front support frame (1) and a rear support frame (2) are symmetrically arranged inside the protective cover (10); a magnetic axis (7) is fixedly arranged between the front support frame (1) and the rear support frame (2); a linear motor (3) is fixedly arranged on the magnetic axis (7); a workbench (5) is fixedly arranged on the linear motor (3); an EDR controller (4) to be tested and an external acceleration sensor (6) are arranged on the workbench (5); The lower end of the protective cover (10) is connected to a control cabinet (12), and an industrial computer (18) and a driver (19) are provided on the control cabinet (12); the external acceleration sensor (6) is connected to the industrial computer (18), the industrial computer (18) is connected to the driver (19), and the driver (19) is connected to the linear motor (3); The front end support frame (1) is provided with a front end return spring (8) arranged opposite to the workbench (5), and the rear end support frame (2) is provided with a rear end return spring (9) arranged opposite to the workbench (5); A slide rail platform base (53) is provided directly below the workbench (5), and a left slide rail (51) and a right slide rail (52) are provided on the slide rail platform base (53) and are arranged parallel to each other. The lower surface of the workbench (5) is provided with two grooves that cooperate with the left slide rail (51) and the right slide rail (52) to guide the sliding movement, and the two grooves are respectively arranged on the left and right sides of the linear motor (3); The protection cover (10) is provided with a protection cover door (11).

2. The EDR acceleration simulation device for an automobile event data recording system according to claim 1, characterized in that: The linear motor (3) comprises: a housing (30) and a coil winding; the housing (30) is provided with an air inlet (31) and an air outlet (32); the coil winding is arranged between the air inlet (31) and the air outlet (32).

3. The EDR acceleration simulation device for an automobile event data recording system according to claim 2, characterized in that: A groove is provided on the upper surface of the slide rail platform base (53) at a position relative to the shell (30), and a gap of 10 cm is provided between the shell (30) and the slide rail platform base (53).

4. The EDR acceleration simulation device for an automobile event data recording system according to claim 1, characterized in that: The control cabinet (12) is provided with a power status indicator light (14), a motor operation indicator light (15) and a motor fault indicator light (16); the power status indicator light (14), the motor operation indicator light (15) and the motor fault indicator light (16) are respectively connected to the industrial computer (18).

5. The EDR acceleration simulation device for an automobile event data recording system according to claim 1, characterized in that: The EDR controller (4) is connected to the workbench (5) via screws.

6. The EDR acceleration simulation device for an automobile event data recording system according to claim 1, characterized in that: The bottom of the control cabinet (12) is provided with a universal wheel (17).

7. The EDR acceleration simulation device for an automobile event data recording system according to claim 1, characterized in that: The magnetic axis (7) comprises: a seamless steel pipe and a permanent magnet, wherein the permanent magnet is arranged inside the seamless steel pipe.

8. The EDR acceleration simulation device for an automobile event data recording system according to claim 7, characterized in that: The front end support frame (1) and the rear end support frame (2) are both connected to the seamless steel pipe via screws.

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