A speed signal conversion box for EPS
By designing a converter box for EPS vehicle speed and rotation speed square wave signals and CAN signals, bidirectional signal conversion is achieved, solving the compatibility problem between new and old versions of EPS controllers, reducing development costs, and improving product compatibility.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TIANJIN DECO INTELLIGENT CONTROL CO LTD
- Filing Date
- 2024-12-18
- Publication Date
- 2026-06-16
AI Technical Summary
The existing EPS controller has compatibility issues between old and new versions, which prevents vehicles from being used interchangeably between different versions of the controller, increasing development costs.
Design a converter box for converting vehicle speed/rotation speed square wave signals to CAN signals for EPS. The MCU, power supply module, signal acquisition and processing module, signal generation module and CAN communication module are integrated on a single circuit board to achieve bidirectional signal conversion. It is suitable for both new and old versions of EPS controllers.
Without modifying the EPS controller hardware and software, the new and old versions of the EPS controller can be used interchangeably on different vehicle models, reducing development costs and improving product compatibility.
Smart Images
Figure CN224361097U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to signal type conversion, particularly the conversion of vehicle speed and rotation speed signal types in EPS (Electric Power Supply). Background Technology
[0002] EPS is being used more and more frequently in the automotive and other steering fields. With the development of technology, vehicle signals are changing from analog signals to digital signals. The vehicle speed, RPM and other signals sent by the vehicle to the EPS controller have also been upgraded from square wave signals to CAN communication signals, reducing wiring harness connections and improving the signal's anti-interference ability and reliability. In the current period where vehicle speed and RPM square wave signals and CAN signals coexist, the newly designed EPS controller has eliminated the hardware acquisition circuit and function of vehicle speed and RPM square wave signals. This means that older models that use vehicle speed and RPM square wave signals cannot use the new version of the controller. Similarly, new vehicles cannot use the old version of the controller for trial installation and comparative testing. Summary of the Invention
[0003] The purpose of this invention is to overcome the shortcomings of existing technology. By using a vehicle speed / rotation speed square wave signal to a CAN signal conversion box, without modifying the software and hardware of the EPS controller, it enables the new and old versions of the EPS controller to be used interchangeably on new and old vehicle models, thereby improving product compatibility, meeting the needs of both new and old customers, and reducing initial development costs.
[0004] This utility model discloses an EPS vehicle speed and rotation speed square wave signal to CAN signal conversion box, the basic components of which include MCU, power supply module, vehicle speed and rotation speed square wave signal acquisition and processing module, vehicle speed and rotation speed square wave signal generation module, CAN communication module, connector, PCB board and housing; wherein the MCU, power supply module, vehicle speed and rotation speed square wave signal acquisition and processing module, vehicle speed and rotation speed square wave signal generation module, CAN communication module and connector are integrated on the same circuit board, fixedly installed in the housing, and extend to the outside of the housing through the connector for signal transmission;
[0005] The converter box is connected in series with the wiring harness between the vehicle and the EPS via connectors. Power supply and signal transmission are handled through these connectors. The power supply module and the EPS controller have the same power supply voltage range and are controlled by the same ignition signal for power-on. The vehicle speed and RPM square wave signal acquisition and processing module consists of two sets of comparison circuits, which process the vehicle speed and RPM square wave signals respectively, converting square wave signals of different levels into square wave signals of the same level as the MCU, facilitating signal recognition by the MCU. The vehicle speed and RPM square wave signal generation module consists of two sets of amplification circuits, amplifying the square wave signal output by the MCU to the same level as the vehicle speed and RPM sensor signals. The MCU is the main control chip, capable of recognizing the frequency of the input vehicle speed and RPM square wave signals, calculating the actual vehicle speed and RPM information, and then converting it into a CAN signal output. Similarly, it can also recognize vehicle speed and RPM CAN signals and convert them into square wave signals of a specific frequency for output. The CAN communication module consists of a CAN chip and its peripheral circuits, used for receiving and transmitting CAN network data. The EPS uses the vehicle speed and RPM square wave signals to communicate with the CA... The N-signal converter box is used in series within the wiring harness between the vehicle and the EPS (Electric Power Supply). When converting vehicle speed and RPM square wave signals to CAN signals, it can convert the vehicle speed and RPM square wave signals sent from the vehicle into square wave signals with the same voltage level as the MCU through a vehicle speed and RPM square wave signal acquisition and processing module. The MCU receives the processed signal, calculates the actual vehicle speed and RPM information based on the frequency of the square wave signal, and then converts it into a digital signal, which is output to the EPS controller via the CAN communication module. Similarly, when converting vehicle speed and RPM CAN signals to square wave signals, it can transmit the vehicle speed and RPM CAN signals sent from the vehicle to the MCU through the CAN communication module. The MCU parses the actual vehicle speed and RPM information according to the communication protocol and then outputs it to the EPS controller through a DA converter and a vehicle speed and RPM square wave signal generation module. This allows for compatibility between new and old versions of the EPS controller on both new and old vehicle models without modifying the EPS controller hardware and software, improving product compatibility, meeting the needs of both new and old customers, and reducing initial development costs.
[0006] As an improvement to the utility model, the EPS vehicle speed square wave signal and CAN signal conversion box can realize bidirectional conversion between vehicle speed square wave signal and CAN signal, and is connected to the wiring harness between the vehicle and EPS through a connector. The type of connector can also be selected and replaced according to actual needs, and it is applicable to different interface vehicles and EPS controllers, and has high versatility.
[0007] As an improvement to the utility model, the EPS vehicle speed square wave signal and CAN signal conversion box and EPS controller are powered by the same power supply and controlled by the same ignition signal to operate. When the EPS is powered off, the conversion box will also power off, reducing unnecessary power consumption.
[0008] As an improvement to the utility model, the EPS vehicle speed and rotation speed square wave signal and CAN signal conversion box can also be freely programmed to simulate vehicle speed and rotation speed signals and output them to the EPS controller in square wave form or CAN communication form, so as to simulate the transmission of vehicle speed and rotation speed signals, so as to facilitate EPS software debugging or bench testing. Attached Figure Description
[0009] Appendix Figure 1 This is a schematic diagram of a box for converting vehicle speed / rotation speed square wave signals to CAN signals for EPS.
[0010] In the attached diagram: 1 is the converter box; 2 and 8 are converter box connectors; 3 is the power supply module; 4 is the vehicle speed and RPM square wave signal acquisition and processing module; 5 is the vehicle speed and RPM square wave signal generation module; 6 is the MCU; 7 is the CAN communication module; 9 and 11 are wiring harness connectors; 10 is the vehicle speed and RPM sensor or EPS controller; 12 is the EPS controller or vehicle CAN network. Detailed Implementation
[0011] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The following embodiments are merely descriptive and not limiting, and should not be used to limit the scope of protection of the present invention.
[0012] Specific implementation method: Example 1, when the old model (vehicle speed and speed are square wave signals) uses the new EPS controller (only supports CAN communication), it is necessary to convert the vehicle speed and speed square wave signals into CAN signals. The conversion box (1) is inserted into the wiring harness between the vehicle and the EPS through the conversion box terminal connector (2) (8) and the wiring harness terminal connector (9), (11). The wiring harness terminal connector (9) is connected to the vehicle speed and speed sensor (10), and the wiring harness terminal connector (11) is connected to the EPS controller (12) on the vehicle. The vehicle supplies power to the conversion box (1) through the wiring harness and the conversion box terminal connector (2). The power supply module (3) will convert the high level provided by the vehicle into an internal low level and supply it to each module. The vehicle speed and speed square wave signals sent by the vehicle are converted into CAN signals through the vehicle speed and speed square wave signal. After the speed square wave signal acquisition and processing module (4) processes the vehicle speed and speed square wave signals of different levels into square wave signals of 0~VCC level and transmits them to the MCU (6). The MCU (6) receives the vehicle speed and speed square wave signals and calculates the actual vehicle speed and speed information according to the frequency of the square wave signal and the frequency and value correspondence of the customer's vehicle speed and speed sensor. Then, it converts the calculated vehicle speed and speed information into numerical signals according to the specified communication protocol and sends them to the CAN communication module (7). The CAN communication module (7) converts the signal into a CAN signal and outputs the obtained CAN signal to the new version EPS controller through the converter box connector (8). After the EPS controller obtains the vehicle speed and speed information, it can provide the corresponding basic power assist, speed-following and return-to-center functions according to the program settings.
[0013] In Example 2, when the new model (vehicle speed and RPM are CAN signals) uses the old EPS controller (which only supports square wave signal input), it is necessary to convert the vehicle speed and RPM CAN signals to square wave signals. The converter box (1) is inserted into the wiring harness between the vehicle and the EPS through the converter box terminal connectors (2) and (8) and the wiring harness terminal connectors (9) and (11). The wiring harness terminal connector (9) is connected to the EPS controller (10) on the vehicle, and the wiring harness terminal connector (11) is connected to the vehicle's CAN network (12). The vehicle supplies power to the converter box (1) through the wiring harness and connector (8). The power supply module (3) will supply the high voltage provided by the vehicle. After being converted to an internal low level, the signal is supplied to various modules. The vehicle speed and rotation speed CAN signals sent by the whole vehicle are converted into digital signals by the CAN communication module (7) and output to the MCU (6). The MCU (6) parses out the actual vehicle speed and rotation speed information according to the prescribed communication protocol and converts it into high and low level signals of 0~VCC. Then, it is converted into square wave signals of different levels and frequencies by the vehicle speed and rotation speed square wave signal generation module (5). The obtained square wave signals are sent to the old version EPS controller through the connector (2). After the EPS controller obtains the vehicle speed and rotation speed information, it can provide the corresponding basic power assist, speed-following and return-to-center functions according to the program settings.
[0014] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.
Claims
1. A speed conversion box for EPS, characterized in that: It comprises an MCU, a power supply module, a vehicle speed and rotating speed square wave signal acquisition and processing module, a vehicle speed and rotating speed square wave signal generation module, a CAN communication module, a connector, a PCB and a shell; wherein the MCU, the power supply module, the vehicle speed and rotating speed square wave signal acquisition and processing module, the vehicle speed and rotating speed square wave signal generation module, the CAN communication module and the connector are integrated on the same circuit board and fixedly installed in the shell and extended out of the shell through the connector for signal transmission.
2. The EPS vehicle speed to rotational speed square wave signal and CAN signal conversion box according to claim 1, characterized in that: The conversion box is connected in series in a wire harness between the whole vehicle and the EPS through the connector and performs power supply and signal transmission through the connector.
3. The EPS vehicle speed to rotational speed square wave signal and CAN signal conversion box according to claim 1, characterized in that: The power supply module has the same power supply voltage range as the EPS controller and is controlled by the same ignition signal to work or not.
4. The EPS vehicle speed to rotational speed square wave signal and CAN signal conversion box according to claim 1, characterized in that: The vehicle speed and rotating speed square wave signal acquisition and processing module is composed of two groups of comparison circuits and processes the vehicle speed and rotating speed square wave signals respectively to convert the square wave signals with different levels into square wave signals with the same level as the MCU for signal recognition of the MCU.
5. The EPS vehicle speed to rotational speed square wave signal and CAN signal conversion box according to claim 1, characterized in that: The vehicle speed and rotating speed square wave signal generation module is composed of two groups of amplification circuits and amplifies the square wave signals output by the MCU to the same level as the vehicle speed and rotating speed sensor signals.
6. The EPS vehicle speed to rotational speed square wave signal and CAN signal conversion box according to claim 1, characterized in that: The MCU is a master control chip, recognizes the frequencies of the input vehicle speed and rotating speed square wave signals, calculates the actual vehicle speed and rotating speed information, converts the information into CAN signals for output, recognizes the vehicle speed and rotating speed CAN signals in the same way and converts the signals into square wave signals with specific frequencies for output.
7. The EPS vehicle speed to rotational speed square wave signal and CAN signal conversion box according to claim 1, characterized in that: The CAN communication module is composed of a CAN chip and its peripheral circuit and is used for receiving and sending CAN network data.