Current detection device for a vehicle steering control circuit

Abstract

The utility model relates to a kind of current detection devices of vehicle steering control circuit, including second current detection module, power module, controller and first current detection module;Power module is used to power supply for each module;The output end of power module is connected to one end of first current detection module, and the power supply end of measured steering control circuit board is connected to the other end of first current detection module, and the drive output end of measured steering control circuit board is connected to one end of second current detection module, and the other end of second current detection module is connected drive load;The input end of controller is respectively connected the output end of first current detection module and the output end of second current detection module;The utility model has realized the detection of the working current of measured steering control circuit board, to prevent the current of measured steering control circuit board and design current deviation too large, cause component damage.

Description

Technical Field

[0001] This utility model relates to the field of vehicle testing technology, specifically to a current detection device for a vehicle steering control circuit. Background Technology

[0002] The vehicle steering control circuit is mainly used to control the rotation of the steering motor to assist in the vehicle's steering control. The steering control circuit is tested during the production process. Usually, the steering control circuit controls the steering motor, and the vehicle steering control is qualified based on the working condition of the steering motor. However, during the test, it is difficult to test whether the working current of the steering control circuit meets the design requirements based solely on the working condition of the steering motor, which may lead to risks such as high power consumption in the steering circuit. Utility Model Content

[0003] In order to solve the technical problem in the prior art that it is difficult to test whether the working current of the steering control circuit meets the design requirements based on the working condition of the steering motor, which leads to risks such as high power consumption in the steering circuit, this utility model provides a current detection device for vehicle steering control circuit.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A current detection device for a vehicle steering control circuit includes a second current detection module, a power supply module, a controller, and a first current detection module; the input terminal of the power supply module is connected to a power supply voltage, and the output terminal of the power supply module is respectively connected to the power supply terminal of the second current detection module, the power supply terminal of the controller, and the power supply terminal of the first current detection module. One end of the first current detection module is connected to the output terminal of the power supply module, and the other end of the first current detection module is connected to the power supply terminal of the steering control circuit board under test. The drive output terminal of the steering control circuit board under test is connected to one end of the second current detection module, and the other end of the second current detection module is connected to the drive load. The input terminal of the controller is connected to the output terminals of the first current detection module and the second current detection module, respectively.

[0005] The beneficial effects of this utility model are: by detecting the power supply current of the steering control circuit board under test through the second current detection module, and by detecting the load current output by the steering control circuit board under test through the second current detection module, and by analyzing the power supply current and load current through the controller respectively, the working current of the steering control circuit board under test can be detected, so as to prevent the current of the steering control circuit board under test from deviating too much from the design current, which would cause damage to the components in the circuit board.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, it also includes a power supply switch module, one end of which is connected to the other end of the first current detection module, the other end of which is connected to the power supply terminal of the steering control circuit board under test, and the output terminal of the controller is connected to the control terminal of the power supply switch module.

[0008] The beneficial effect of adopting the above-mentioned further solution is that, by setting up a power supply switch module, the power supply switch module can be controlled by the controller to switch on and off, thereby realizing the switching on and off of the power supply to the steering control circuit board under test.

[0009] Furthermore, the power supply switch module includes an electronic control switch unit and a relay; the output terminal of the power supply module is connected to one end of the coil of the relay, the other end of the first current detection module is connected to one end of the normally open contact of the relay, and the other end of the normally open contact of the relay is connected to the power supply terminal of the steering control circuit board under test. One end of the electronically controlled switch unit is connected to the other end of the relay coil, the other end of the electronically controlled switch unit is grounded, and the control terminal of the electronically controlled switch unit is connected to the output terminal of the controller.

[0010] The beneficial effect of adopting the above-mentioned further solution is that by using the electronic control switch unit to drive the relay coil to switch on and off, the switching on and off of the relay switch can be controlled by a small voltage.

[0011] Furthermore, the electronically controlled switch unit includes a first transistor, a first resistor, and a second resistor. The collector of the first transistor is connected to the other end of the coil of the relay, the emitter of the first transistor is grounded, the base of the first transistor is connected to one end of the first resistor and one end of the second resistor, the other end of the first resistor is connected to the output terminal of the controller, and the other end of the second resistor is grounded.

[0012] The beneficial effect of adopting the above-mentioned further scheme is that the first transistor is used to control the on and off of the relay coil, so as to realize the enable control of the relay.

[0013] Furthermore, the electronically controlled switch unit also includes an optocoupler and a third resistor. The positive terminal of the input terminal of the optocoupler is connected to one end of the third resistor. The output terminal of the power module is connected to the collector of the output terminal of the optocoupler and the other end of the third resistor, respectively. The negative terminal of the input terminal of the optocoupler is connected to the output terminal of the controller through a first light-emitting diode in series.

[0014] The advantage of adopting the above-mentioned further solution is that by setting up an optocoupler, the control voltage output by the controller can be isolated from the power supply voltage of the transistor and the relay, thereby improving the power safety of each component.

[0015] Furthermore, it also includes an alarm module, the power supply terminal of which is connected to the output terminal of the power supply module, and the control terminal of the alarm module is connected to the output terminal of the controller.

[0016] Furthermore, the alarm module includes a second light-emitting diode, a fourth resistor, a fifth resistor, and a second transistor; the positive terminal of the second light-emitting diode is connected to the output terminal of the power supply module, the negative terminal of the second light-emitting diode is connected to the collector of the second transistor, the emitter of the second transistor is grounded, the base of the second transistor is connected to one end of the fourth resistor and one end of the fifth resistor, the other end of the fourth resistor is connected to the output terminal of the controller, and the other end of the fifth resistor is grounded.

[0017] The beneficial effect of adopting the above-mentioned further solution is that, by setting the alarm module, when the power supply current or load current exceeds the preset threshold, the controller outputs a pulse voltage to control the second light-emitting diode to flash, thereby realizing the alarm function.

[0018] Furthermore, it also includes a display module, the power supply terminal of which is connected to the output terminal of the power supply module, and the transceiver terminal of the display module is connected to the transceiver terminal of the controller.

[0019] The advantage of adopting the above-mentioned further solution is that by setting up a display module, the detected power supply current or load current value can be displayed.

[0020] Furthermore, it also includes a position sensor, the output of the power module is connected to the power supply of the position sensor, the position sensor is used to detect the position of the steering control circuit board under test; the output of the position sensor is connected to the signal input of the controller.

[0021] Furthermore, the position sensor is a proximity photoelectric switch.

[0022] The beneficial effect of adopting the above-mentioned further solution is that, by setting a position sensor, it is possible to detect whether the steering control circuit board under test exists at the work station to be tested or whether the steering control circuit board under test has reached the preset position. Attached Figure Description

[0023] Figure 1 This is a circuit block diagram of the present invention; Figure 2 This is the circuit diagram for the power supply switch module; Figure 3 This is the circuit diagram for the alarm module.

[0024] The attached diagram lists the components represented by each number as follows: 1. Second current detection module; 2. Position sensor; 3. Alarm module; 4. Power supply module; 5. Display module; 6. Controller; 7. First current detection module; 8. Power supply switch module; 9. Steering control circuit board under test; 10. Drive load. Detailed Implementation

[0025] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0026] like Figure 1 As shown, this embodiment provides a current detection device for a vehicle steering control circuit, including a second current detection module 1, a power supply module 4, a controller 6, a first current detection module 7, a power supply switch module 8, an alarm module 3, a display module 5, and a position sensor 2. The input terminal of the power supply module 4 is connected to a power supply voltage, and the output terminal of the power supply module 4 is connected to the power supply terminals of the second current detection module 1, the controller 6, and the first current detection module 7, respectively. The power supply module 4 can be a power converter that simultaneously outputs 24V and 5V DC power, and its input voltage is 220V AC voltage. The 24V voltage output by the power supply module 4 powers the display module 5, the power supply switch module 8, and the steering control circuit board 9 under test, while the 5V voltage output by the power supply module 4 powers the second current detection module 1, the controller 6, the first current detection module 7, and the alarm module 3. The controller 6 can be a microcontroller or a PLC controller. Both the second current detection module 1 and the first current detection module 7 use Hall effect current sensors.

[0027] One end of the first current detection module 7 is connected to the output terminal of the power supply module 4, and the other end of the first current detection module 7 is connected to the power supply terminal of the steering control circuit board 9 under test. The drive output terminal of the steering control circuit board 9 under test is connected to one end of the second current detection module 1, and the other end of the second current detection module 1 is connected to the drive load 10. The input terminal of the controller 6 is connected to the output terminal of the first current detection module 7 and the output terminal of the second current detection module 1, respectively.

[0028] One end of the power supply switch module 8 is connected to the other end of the first current detection module 7, and the other end of the power supply switch module 8 is connected to the power supply terminal of the steering control circuit board 9 under test. The output terminal of the controller 6 is connected to the control terminal of the power supply switch module 8. By setting the power supply switch module 8, the controller 6 can control the on / off state of the power supply switch module 8, thereby realizing the on / off state of the power supply to the steering control circuit board 9 under test.

[0029] The power supply terminal of the alarm module 3 is connected to the output terminal of the power supply module 4, and the control terminal of the alarm module 3 is connected to the output terminal of the controller 6.

[0030] The power supply terminal of the display module 5 is connected to the output terminal of the power supply module 4, and the transceiver terminal of the display module 5 is connected to the transceiver terminal of the controller 6. By configuring the display module 5, the detected supply current or load current value can be displayed.

[0031] This embodiment of the invention uses a second current detection module 1 to detect the power supply current of the steering control circuit board 9 under test, and uses the second current detection module 1 to detect the load current output by the steering control circuit board 9 under test. The controller 6 analyzes the power supply current and the load current respectively, thereby realizing the detection of the operating current of the steering control circuit board 9 under test, so as to prevent the current of the steering control circuit board 9 under test from deviating too much from the design current, which could damage the components in the circuit board.

[0032] Since both current detection modules output voltage values, the controller derives the current magnitude by analyzing the voltage values ​​output by the current detection modules. Detecting current values ​​using current sensors and analyzing them using a microcontroller or PLC controller is a conventional technique in this field. Therefore, this invention does not involve improvements to the computer program.

[0033] like Figure 2 As shown, the power supply switch module 8 includes an electronic control switch unit and a relay K1; the output terminal of the power supply module 4 is connected to one end of the coil of the relay K1, the other end of the first current detection module 7 is connected to one end of the normally open contact of the relay K1, and the other end of the normally open contact of the relay K1 is connected to the power supply terminal of the steering control circuit board 9 under test. One end of the electronic control switch unit is connected to the other end of the coil of the relay K1, the other end of the electronic control switch unit is grounded, and the control terminal of the electronic control switch unit is connected to the output terminal of the controller 6.

[0034] When the electronic control switch unit is in the ON state, the coil of relay K1 is energized, the normally open contact of relay K1 is closed, and the power supply to the tested steering control circuit board 9 is turned on; when the electronic control switch unit is in the OFF state, the coil of relay K1 is de-energized, the normally open contact of relay K1 is opened, and the power supply to the tested steering control circuit board 9 is cut off; by using the electronic control switch unit to drive the coil of relay K1 to turn on and off, the on and off of the relay K1 switch can be controlled by a small voltage.

[0035] The output terminal of the power module 4 is connected to the power supply terminal of the position sensor 2, which is used to detect the position of the steering control circuit board 9 under test; the output terminal of the position sensor 2 is connected to the signal input terminal of the controller 6. The position sensor 2 is a proximity photoelectric switch.

[0036] When the steering control circuit board 9 under test reaches the predetermined position of the testing station, the proximity photoelectric switch is triggered and outputs a high level to the controller. After receiving the high level, the controller sends a power supply control command to the power supply switch module. Under the control of the power supply control command, the power supply switch module is turned on to realize the power supply control of the steering control circuit board 9 under test. By setting the position sensor 2, it is possible to detect whether the steering control circuit board 9 under test exists at the testing station or whether the steering control circuit board 9 under test has reached the preset position.

[0037] In some embodiments, the electronically controlled switch unit includes a first transistor Q1, a first resistor R1, and a second resistor R2. The collector of the first transistor Q1 is connected to the other end of the coil of the relay K1, the emitter of the first transistor Q1 is grounded, the base of the first transistor Q1 is connected to one end of the first resistor R1 and one end of the second resistor R2, the other end of the first resistor R1 is connected to the output terminal of the controller 6, and the other end of the second resistor R2 is grounded.

[0038] When the base of the first transistor Q1 is at a high level, the first transistor Q1 is turned on, thereby energizing the coil of relay K1; when the base of the first transistor Q1 is at a low level, the first transistor Q1 is turned off, thereby de-energizing the coil of relay K1; the first transistor Q1 is used to control the on and off of the coil of relay K1 to realize the enable control of relay K1.

[0039] In some embodiments, the electronically controlled switch unit further includes an optocoupler U1 and a third resistor R3. The positive terminal of the input terminal of the optocoupler U1 is connected to one end of the third resistor R3. The output terminal of the power module 4 is connected to the collector of the output terminal of the optocoupler U1 and the other end of the third resistor R3, respectively. The negative terminal of the input terminal of the optocoupler U1 is connected to the output terminal of the controller 6 through a first light-emitting diode D2 in series.

[0040] When the output of controller 6 is high, both the positive and negative terminals of the input of optocoupler U1 are high, the LED inside optocoupler U1 is off, the transistor at the output of optocoupler U1 is off, and the base of the first transistor Q1 is low. When the output of controller 6 is low, the positive terminal of the input of optocoupler U1 is connected to a 5V voltage, and the negative terminal is equivalent to ground. Then the LED inside optocoupler U1 is on, the transistor at the output of optocoupler U1 is on, and the base of the first transistor Q1 is high. By setting optocoupler U1, the control voltage output of controller 6 can be isolated from the power supply voltage of the transistor and relay K1, thereby improving the power safety of various components.

[0041] like Figure 3 As shown, the alarm module 3 includes a second light-emitting diode D3, a fourth resistor R4, a fifth resistor R5, and a second transistor Q2; the positive terminal of the second light-emitting diode D3 is connected to the output terminal of the power supply module 4, the negative terminal of the second light-emitting diode D3 is connected to the collector of the second transistor Q2, the emitter of the second transistor Q2 is grounded, the base of the second transistor Q2 is connected to one end of the fourth resistor R4 and one end of the fifth resistor R5, the other end of the fourth resistor R4 is connected to the output terminal of the controller 6, and the other end of the fifth resistor R5 is grounded.

[0042] When the two current detection modules received by the controller 6 both output a voltage value that is higher than the preset range or lower than the preset range, the controller 6 outputs a high-level pulse signal, the second transistor Q2 is turned on intermittently, and the second light-emitting diode D3 is intermittently energized. By setting the alarm module 3, when the supply current or load current exceeds the preset threshold, the controller 6 outputs a pulse voltage to control the second light-emitting diode D3 to flash, thereby realizing the alarm function.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A current detection device for a vehicle steering control circuit, characterized in that: It includes a second current detection module (1), a power supply module (4), a controller (6), and a first current detection module (7); the input terminal of the power supply module (4) is connected to the power supply voltage, and the output terminal of the power supply module (4) is connected to the power supply terminal of the second current detection module (1), the power supply terminal of the controller (6), and the power supply terminal of the first current detection module (7), respectively. One end of the first current detection module (7) is connected to the output end of the power supply module (4), and the other end of the first current detection module (7) is connected to the power supply end of the steering control circuit board (9) under test. The drive output end of the steering control circuit board (9) under test is connected to one end of the second current detection module (1), and the other end of the second current detection module (1) is connected to the drive load (10). The input end of the controller (6) is connected to the output end of the first current detection module (7) and the output end of the second current detection module (1) respectively.

2. The current detection device for the vehicle steering control circuit according to claim 1, characterized in that: It also includes a power supply switch module (8), one end of which is connected to the other end of the first current detection module (7), the other end of which is connected to the power supply terminal of the steering control circuit board (9) under test, and the output terminal of the controller (6) is connected to the control terminal of the power supply switch module (8).

3. The current detection device for the vehicle steering control circuit according to claim 2, characterized in that: The power supply switch module (8) includes an electronic control switch unit and a relay (K1); the output end of the power supply module (4) is connected to one end of the coil of the relay (K1), the other end of the first current detection module (7) is connected to one end of the normally open contact of the relay (K1), and the other end of the normally open contact of the relay (K1) is connected to the power supply end of the steering control circuit board (9) under test. One end of the electronic control switch unit is connected to the other end of the coil of the relay (K1), the other end of the electronic control switch unit is grounded, and the control terminal of the electronic control switch unit is connected to the output terminal of the controller (6).

4. The current detection device for the vehicle steering control circuit according to claim 3, characterized in that: The electronically controlled switch unit includes a first transistor (Q1), a first resistor (R1), and a second resistor (R2). The collector of the first transistor (Q1) is connected to the other end of the coil of the relay (K1). The emitter of the first transistor (Q1) is grounded. The base of the first transistor (Q1) is connected to one end of the first resistor (R1) and one end of the second resistor (R2). The other end of the first resistor (R1) is connected to the output terminal of the controller (6), and the other end of the second resistor (R2) is grounded.

5. The current detection device for the vehicle steering control circuit according to claim 4, characterized in that: The electronic control switch unit also includes an optocoupler (U1) and a third resistor (R3). The positive terminal of the input terminal of the optocoupler (U1) is connected to one end of the third resistor (R3). The output terminal of the power module (4) is connected to the collector of the output terminal of the optocoupler (U1) and the other end of the third resistor (R3). The negative terminal of the input terminal of the optocoupler (U1) is connected to the output terminal of the controller (6) through a first light-emitting diode (D2) in series.

6. The current detection device for the vehicle steering control circuit according to claim 1, characterized in that: It also includes an alarm module (3), the power supply terminal of which is connected to the output terminal of the power module (4), and the control terminal of the alarm module (3) is connected to the output terminal of the controller (6).

7. The current detection device for the vehicle steering control circuit according to claim 6, characterized in that: The alarm module (3) includes a second light-emitting diode (D3), a fourth resistor (R4), a fifth resistor (R5), and a second transistor (Q2); the positive terminal of the second light-emitting diode (D3) is connected to the output terminal of the power supply module (4), the negative terminal of the second light-emitting diode (D3) is connected to the collector of the second transistor (Q2), the emitter of the second transistor (Q2) is grounded, the base of the second transistor (Q2) is connected to one end of the fourth resistor (R4) and one end of the fifth resistor (R5), the other end of the fourth resistor (R4) is connected to the output terminal of the controller (6), and the other end of the fifth resistor (R5) is grounded.

8. The current detection device for the vehicle steering control circuit according to claim 1, characterized in that: It also includes a display module (5), the power supply terminal of which is connected to the output terminal of the power supply module (4), and the transceiver terminal of the display module (5) is connected to the transceiver terminal of the controller (6).

9. The current detection device for the vehicle steering control circuit according to claim 1, characterized in that: It also includes a position sensor (2), the output end of the power module (4) is connected to the power supply end of the position sensor (2), the position sensor (2) is used to detect the position of the steering control circuit board (9) under test; the output end of the position sensor (2) is connected to the signal input end of the controller (6).

10. The current detection device for the vehicle steering control circuit according to claim 9, characterized in that: The position sensor (2) is a proximity photoelectric switch.

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