Automobile analog quantity sensor OBD fault simulation device
By designing an OBD fault simulation device for automotive analog sensors and using circuit fault setting switches to achieve multiple fault simulations, the problems of poor operational safety, limited fault simulation range and long verification cycle in the existing technology have been solved, and the safety of fault simulation has been improved. sex and efficiency.
Patent Information
- Application Number
- CN202421099375.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-01-21
- Estimated Expiration
- 2034-05-20
AI Technical Summary
The existing OBD fault simulation devices have poor operating safety, limited fault simulation range, and long verification cycle, making it difficult to meet strict monitoring and verification requirements.
An automotive analog sensor OBD fault simulation device is designed, including a sensor side interface, an ECU side interface and a circuit fault setting switch. Fault simulation is performed through a series fault simulation device, and the fault status can be flexibly set to improve operational safety and efficiency.
It realizes convenient simulation of various sensor faults, improves operational safety and efficiency, simplifies the verification process, and shortens the verification cycle.
Smart Images
Figure CN222379348U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of automobile fault simulation, in particular to an automobile analog quantity sensor OBD fault simulation device. Background Art
[0002] The OBD (On-Board Diagnosis) fault simulator is a device used to simulate automobile faults, usually used in the field of automobile maintenance and diagnosis. It simulates various automobile faults such as engine failure, excessive emissions, fuel system failure, etc. by connecting to the automobile diagnostic interface (OBD interface), so that maintenance personnel can quickly diagnose and repair vehicle problems.
[0003] With the continuous upgrading of automobile emission standards, the requirements for OBD monitoring systems are becoming increasingly stringent, and the monitoring parameters are increasing. This has brought severe challenges to the supervision, development and verification of OBD. For vehicle-mounted sensors, it is required not only to monitor their circuit faults, but also to monitor the rationality of their signals.
[0004] At present, sensor OBD fault simulation mainly uses the wiring harness signal adapter box to perform open or short circuit operations, but this method has certain limitations. Poor operational safety: Due to the complex on-board wiring harness and the large number of interfaces in the signal adapter box, misoperation is prone to occur, posing a threat to the safety of maintenance personnel. Limited fault simulation range: This method can only simulate simple circuit faults, and the fault simulation effect of complex digital signals and analog signals is not good. Impact on verification efficiency: The simulation of the rationality of the sensor signal requires the use of matching degraded parts, which leads to a long OBD verification preparation cycle and a complicated operation process for replacing degraded parts, which also prolongs the verification cycle.
[0005] Although there is a method to simulate the rationality of sensor signal faults by connecting resistors in series or in parallel, this method also has certain limitations. It can only realize fault function verification: this method cannot collect the normal state signal of the sensor and the signal after fault simulation at the same time, which is not conducive to data analysis for development and verification; inconvenient operation: different resistors need to be prepared according to the fault mode, and connecting or replacing resistors is time-consuming, labor-intensive and inefficient, which is not conducive to product development and regulatory verification. Utility Model Content
[0006] The purpose of the utility model is to provide an OBD fault simulation device for an automobile analog sensor, and the technical solution can perform multiple fault simulations more conveniently.
[0007] To achieve the above purpose, the utility model provides a basic solution: an automobile analog sensor OBD fault simulation device, including a sensor side interface terminal, an ECU side interface terminal and a circuit fault setting switch;
[0008] The sensor side interface end is used to connect with the vehicle sensor side wiring harness; the ECU side interface end is used to connect with the ECU side wiring harness, including a second power supply interface, a signal output interface and a second ground interface; the circuit fault setting switch includes a short-circuit switch to the ground, a short-circuit switch to the power supply, and a normal mode switch;
[0009] The normal mode switch is provided at each of the ECU side interface ends; the power short-circuit switch and the ground short-circuit switch are arranged in series on the connection line of the second signal interface, the ON end of the power short-circuit switch is connected to the connection line of the second power interface, and the ON end of the ground short-circuit switch is connected to the connection line of the second ground interface.
[0010] Principle and beneficial effects of the basic solution: This solution can directly simulate the fault by connecting the fault simulation device in series at the sensor position. Compared with the flying wire method of the wiring harness adapter box, this solution only needs to know the pin definition of the sensor to realize the fault simulation operation, eliminating the complicated process of searching the adapter box interface;
[0011] By adjusting the circuit fault setting switch, you can set the simulated fault state. For the simulation of sensor rationality fault, you can manually set the fault conditions for different sensor fault modes. The condition setting is flexible, easy to operate, convenient, fast and safe. By switching the circuit fault setting switch module, you can simulate the open circuit fault of the sensor, the short circuit fault to the power supply, and the short circuit fault to the ground. When the normal mode switch in the fault setting switch is at the "ON" end, the short-circuit switch to the power supply is at the "OFF" end, and the short-circuit switch to the ground is at the "OFF" end, the sensor is normally connected to the vehicle ECU; when the normal mode switch in the fault setting switch is at the "OFF" end, the short-circuit switch to the power supply is at the "OFF" end, and the short-circuit switch to the ground is at the "OFF" end, the sensor is disconnected from the vehicle ECU, and the sensor is in an open circuit fault state; when the normal mode switch in the fault setting switch is at the "ON" end, the short-circuit switch to the power supply is at the "ON" end, and the short-circuit switch to the ground is at the "OFF" end, the sensor is in a short-circuit fault state to the power supply; when the normal mode switch in the fault setting switch is at the "ON" end, the short-circuit switch to the power supply is at the "OFF" end, and the short-circuit switch to the ground is at the "ON" end, the sensor is in a short-circuit fault state to the ground.
[0012] As an implementable preferred solution, the sensor side interface end includes a first power supply interface, a signal acquisition interface and a first ground line interface.
[0013] As an implementable preferred solution, the circuit fault setting switch also includes an active / passive switch; the active / passive switch is arranged on the connection line of the signal acquisition interface.
[0014] As an implementable preferred solution, the active end of the active / passive switch is arranged on the connection line of the signal acquisition interface.
[0015] As an implementable preferred solution, the passive end of the active / passive switch is connected to an ECU internal resistance simulation module, and the other end of the ECU internal resistance simulation module is connected to the connection line of the first power interface.
[0016] As an implementable preferred solution, the ECU internal resistance simulation module uses a variable resistor.
[0017] As an implementable preferred solution, the ECU internal resistance simulation module adopts a knob-type variable resistor.
[0018] As an implementable preferred solution, it also includes a USB connection port for connecting the fault simulation device to a computer via a USB connection cable. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 This is the installation and connection diagram of the OBD fault simulation device for the automobile analog sensor;
[0020] Figure 2 This is a front structural diagram of the OBD fault simulation device for the automobile analog sensor;
[0021] Figure 3 This is a schematic diagram of the internal structure of the OBD fault simulation device for the automobile analog sensor;
[0022] Figure 4 This is a wiring diagram of the active signal vehicle-mounted sensor;
[0023] Figure 5 This is a wiring diagram of a passive signal vehicle-mounted sensor. DETAILED DESCRIPTION
[0024] The technical solution of this application is further described in detail below through specific implementation methods:
[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "setting" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection (including various mechanical connection forms, such as couplings or gear pairs, etc.), or an electrical connection; it can be a direct connection, or an indirect connection 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 according to specific circumstances.
[0026] In addition, it should be noted that, in the description of the present invention, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.
[0027] Figure numerals: sensor side interface terminal 100, first power interface 101, signal acquisition interface 102, first ground interface 103, ECU side interface terminal 200, second power interface 201, signal output interface 202, second ground interface 203, ground short-circuit switch 301, power short-circuit switch 302, normal mode switch 303, active / passive switch 304, ECU internal resistance simulation module 400, USB connection port 500.
[0028] Reference Figure 1 and Figure 2 The vehicle analog sensor OBD fault simulation device includes a sensor ECU side interface terminal 200, an ECU (Electronic Control Unit) ECU side interface terminal 200, a circuit fault setting switch and an ECU internal resistance simulation module 400. The sensor ECU side interface terminal 200 is used to connect with the vehicle sensor side wiring harness, including a first power interface 101, a signal acquisition interface 102 and a first ground interface 103. The ECU side interface terminal 200 is used to connect with the ECU side wiring harness, including a second power interface 201, a signal output interface 202 and a second ground interface 203. The circuit fault setting switch includes a short-circuit switch to ground 301, a short-circuit switch to power 302, a normal mode switch 303 and an active / passive switch.
[0029] Reference Figure 3 The ECU side interface terminal 200 is provided with a normal mode switch 303, and the control ends of the normal mode switches 303 are connected in series to form a unified control point, so that the opening and closing of all normal mode switches 303 can be controlled simultaneously by a single signal, while also reducing the wiring complexity.
[0030] The power short-circuit switch 302 and the ground short-circuit switch 301 are arranged in series on the connection line of the second signal interface, the "ON" end of the power short-circuit switch 302 is connected to the connection line of the second power interface 201, and the "ON" end of the ground short-circuit switch 301 is connected to the connection line of the second ground interface 203.
[0031] Adjust the circuit fault setting switch, set the simulated fault state, and simulate the sensor's open circuit fault, power supply short circuit fault, and ground short circuit fault by switching the circuit fault setting switch module. When the normal mode switch 303 in the fault setting switch is at the "ON" end, the short-circuit switch 302 to the power supply is at the "OFF" end, and the short-circuit switch 301 to the ground is at the "OFF" end, the sensor is normally connected to the automobile ECU; when the normal mode switch 303 in the fault setting switch is at the "OFF" end, the short-circuit switch 302 to the power supply is at the "OFF" end, and the short-circuit switch 301 to the ground is at the "OFF" end, the sensor is disconnected from the automobile ECU, and the sensor is in an open circuit fault state; when the normal mode switch 303 in the fault setting switch is at the "ON" end, the short-circuit switch 302 to the power supply is at the "ON" end, and the short-circuit switch 301 to the ground is at the "OFF" end, the sensor is in a short-circuit fault state to the power supply; when the normal mode switch 303 in the fault setting switch is at the "ON" end, the short-circuit switch 302 to the power supply is at the "OFF" end, and the short-circuit switch 301 to the ground is at the "ON" end, the sensor is in a short-circuit fault state to the ground.
[0032] The active / passive switch is arranged on the connection line of the signal acquisition interface 102, the "active" end of the active / passive switch is arranged on the connection line of the signal acquisition interface 102, the "passive end" is connected with the ECU internal resistance simulation module 400, and the other end of the ECU internal resistance simulation module 400 is connected to the connection line of the first power supply interface 101. The ECU internal resistance simulation module 400 preferably adopts a variable resistor, and in this embodiment, a knob-type variable resistor is adopted.
[0033] By switching between active analog signal and passive analog signal in conjunction with the built-in resistance simulation module of the passive analog ECU, the simulated fault device can be connected to active signal vehicle-mounted sensors and passive signal vehicle-mounted sensors, and realize fault simulation of active signal vehicle-mounted sensors and passive signal vehicle-mounted sensors. According to the sensor pin definition, each pin of the sensor is connected to the sensor ECU side interface terminal 200 of the fault simulation device according to the corresponding relationship. At the same time, the ECU side interface terminal 200 of the fault simulation device is connected to the connector of the ECU side wiring harness in the same operating method.
[0034] Active signal vehicle sensors generally have 3 pins, 1 pin for 5V power supply, 1 pin for signal, and 1 pin for ground. The wiring method is as follows Figure 4 Passive signal vehicle sensors generally have 2 pins, 1 pin is for signal, 1 pin is for ground, and the 5V power supply corresponding interface is vacant. The wiring method is as follows Figure 5 .
[0035] When an active signal vehicle sensor is connected, the active / passive switch is at the "active" end, and the fault simulation device is used to simulate the fault of the sensor with independent power supply on the ECU harness side. To connect a passive signal vehicle sensor, the sensor must be connected to the ECU normally first, and the ECU is connected to a universal diagnostic instrument to read the sensor value through the OBD data stream. When a passive signal vehicle sensor is connected, the active / passive switch is at the "passive" end, and the fault simulation device is used to simulate the fault of the sensor without independent power supply on the ECU harness side. By adjusting the ECU built-in resistance simulation module to simulate the ECU internal resistance, the sensor value read by the OBD data stream is consistent with the normal connection state of the sensor and the ECU, and the passive signal sensor ECU internal resistance simulation is completed.
[0036] It also includes a USB connection port 500, which is used to connect the fault simulation device to a computer via a USB connection line, collect original signals of vehicle-mounted sensors and set fault condition outputs through software, thereby realizing static rationality and dynamic rationality fault simulation of sensor signals. In this process, the original signals and fault signals can be electronically stored through software.
[0037] The circuit fault setting switch is set as follows: when the normal mode switch 303 is at the "ON" end, the power short-circuit switch 302 is at the "OFF" end, and the ground short-circuit switch 301 is at the "OFF" end, open the signal acquisition and output setting software pre-installed on the computer, click InitDevice, and officially start the signal acquisition and output setting function. When the car engine is shut down and powered on or the car is running, the signal is converted according to y=ax+b; where x is the input signal, y is the output signal, and x and y are the same type of signals; the original signal of the sensor can be reduced by setting the a value in the range of 0.00 to 1.00; the original signal of the sensor can be amplified by setting the a value in the range of 1.00 to 5.00; the original signal can be offset by setting the b value in the range of -5.00 to 5.00;
[0038] After completing the fault simulation conditions, click StartSample. The rational fault simulation is now complete, and the a and b input boxes are locked and cannot be changed. If you need to change the set values of a and b, click StopSample and repeat the above operation. If you need to store data in real time, check Save and set the corresponding save location. The data collection frequency can be achieved by setting SampleSpeed in the range of 0-10.
[0039] Through the above technical solution, the electronic storage and online chart numerical observation of the original signal and fault status signal can be realized.
[0040] The above contents are only embodiments of the utility model. The common sense such as the known specific structures and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field know all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The protection scope required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to explain the content of the claims.
Claims
1. Automobile analog sensor OBD fault simulation device, characterized by: It includes a sensor side interface terminal, an ECU side interface terminal and a circuit fault setting switch; The sensor side interface end is used to connect with the vehicle sensor side wiring harness; the ECU side interface end is used to connect with the ECU side wiring harness, including a second power supply interface, a signal output interface and a second ground interface; the circuit fault setting switch includes a short-circuit switch to the ground, a short-circuit switch to the power supply and a normal mode switch; The normal mode switch is provided at each of the ECU side interface ends; the power short-circuit switch and the ground short-circuit switch are arranged in series on the connection line of the second signal interface, the ON end of the power short-circuit switch is connected to the connection line of the second power interface, and the ON end of the ground short-circuit switch is connected to the connection line of the second ground interface.
2. The OBD fault simulation device for an automobile analog quantity sensor according to claim 1, characterized in that: The sensor side interface end includes a first power supply interface, a signal acquisition interface and a first ground line interface.
3. The OBD fault simulation device for an automobile analog quantity sensor according to claim 2, characterized in that: The circuit fault setting switch also includes an active / passive switch; the active / passive switch is arranged on the connection line of the signal acquisition interface.
4. The OBD fault simulation device for an automobile analog quantity sensor according to claim 3, characterized in that: The active end of the active / passive switch is arranged on the connection line of the signal acquisition interface.
5. The OBD fault simulation device for automobile analog quantity sensor according to claim 4 is characterized in that: The passive end of the active / passive switch is connected to an ECU internal resistance simulation module, and the other end of the ECU internal resistance simulation module is connected to the connection line of the first power supply interface.
6. The OBD fault simulation device for automobile analog quantity sensor according to claim 5, characterized in that: The ECU internal resistance simulation module uses a variable resistor.
7. The OBD fault simulation device for automobile analog quantity sensor according to claim 6, characterized in that: The ECU internal resistance simulation module adopts a knob-type variable resistor.
8. The OBD fault simulation device for an automobile analog sensor according to any one of claims 1 to 7, characterized in that: It also includes a USB connection port, which is used to connect the fault simulation device to a computer via a USB connection line.