Voltage-variable generator voltage regulator with single-path CAN (Controller Area Network) bus function

Abstract

The utility model relates to a voltage-variable generator voltage regulator with a single CAN bus function, which belongs to the technical field of automotive electronics and comprises an MCU module, the MCU module is externally connected with an electronic control unit of a vehicle by means of a communication unit, the communication unit comprises a chip U300, the communication end of the chip U300 is connected with the MCU module, the interface end of the chip U300 is a CAN interface, and the interface end of the chip U300 is connected with the MCU module. And the controller is connected with the electronic control unit. According to the method, a CAN communication mode is applied to serve as a communication unit of the automobile generator voltage regulator, compared with LIN connection, CAN connection is higher in stability and communication efficiency, when the generator voltage regulator detects that voltage or current is abnormal, information can be fed back to a trip computer more quickly, and the safety of the trip computer is improved. Meanwhile, commands of the trip computer to the generator regulator can be transmitted more accurately.

Description

TECHNICAL FIELD

[0001] The application relates to the field of automobile electronics, and relates to a voltage regulator, in particular a voltage-variable generator voltage regulator with a single CAN bus function. BACKGROUND

[0002] The automobile generator is the main power supply of the automobile, and functions to supply power to all electrical equipment (except the starter) when the engine is normally running, and to charge the storage battery.

[0003] The application is based on the digital automobile generator intelligent regulator with the application number CN20B13697A, which comprises an MCU module, a generator output voltage detection unit and a generator excitation current regulation unit.

[0004] The MCU module is connected with the generator output voltage detection unit, the generator output voltage detection unit is connected with the generator output end, the MCU module obtains the generator output voltage through the generator output voltage detection unit, and the generator excitation current regulation unit is connected with the generator rotor coil.

[0005] The MCU module is connected with the vcc end in the generator excitation current regulation unit to obtain the vcc end voltage, and the vcc end voltage and the generator output voltage are compared, if the vcc end voltage and the generator output voltage are the same, a first signal is output, if the vcc end voltage and the generator output voltage are different, and the generator output voltage is greater than a first voltage threshold, a second signal is output.

[0006] In the digital automobile generator intelligent regulator, the generator voltage regulator and the electronic control unit are connected through the lin bus, and the lin bus has the problems of low transmission efficiency and poor stability. SUMMARY

[0007] The application provides the voltage-variable generator voltage regulator with the single CAN bus function, solves the problems of low transmission efficiency and poor stability of the Lin bus, and can improve the transmission efficiency of the generator voltage regulator and the electronic control unit.

[0008] The technical scheme of the application is as follows:

[0009] The voltage-variable generator voltage regulator with the single CAN bus function comprises an MCU module, the MCU module is connected with the electronic control unit of a vehicle through a communication unit, the communication unit comprises a chip U300, a communication end of the chip U300 is connected with the MCU module, an interface end of the chip U300 is a CAN interface, and the electronic control unit is connected.

[0010] As a further optimization of this solution, the TXD pin of the chip U300 is connected to the AN9 pin of the MCU module, and the RXD pin of the chip U300 is connected to the AN9 pin and TX pin of the MCU module.

[0011] As a further optimization of this solution, the CANH pin of the chip U300 is used as the CANH interface, the CANL pin of the chip U300 is used as the CANL interface, and the CANH interface and the CANL interface are used as the CAN interface.

[0012] As a further optimization of this solution, a resistor R300 is connected in parallel between the CANL pin and the CANH pin of the chip U300.

[0013] As a further optimization of this solution, the RS4 pin of the MCU module is also connected to a generator output voltage detection unit.

[0014] As a further optimization of this solution, the RA2 pin of the MCU module is also connected to a generator rotor speed detection unit.

[0015] As a further optimization of this solution, the RC6 pin of the MCU module is also connected to an indicator light error prevention unit.

[0016] As a further optimization of this solution, the RC2 pin of the MCU module is also connected to a generator excitation current regulation unit.

[0017] The working principle and beneficial effects of this invention are as follows:

[0018] In this method, CAN communication is used as the communication unit of the automotive alternator voltage regulator. Compared with LIN connection, CAN connection is more stable and has higher communication efficiency. When the alternator voltage regulator detects abnormal voltage or current, it can feed the information back to the vehicle computer more quickly. At the same time, the vehicle computer can transmit commands to the alternator regulator more accurately. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is the circuit schematic diagram of this application. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] A voltage-variable generator voltage regulator with single-channel CAN bus functionality includes an MCU module. The MCU module is externally connected to the vehicle's electronic control unit (ECU) via a communication unit, which includes a chip U300. The communication terminal of chip U300 is connected to the MCU module, and the interface terminal of chip U300 is a CAN interface connected to the ECU. The TXD pin of chip U300 is connected to the AN9 pin of the MCU module, and the RXD pin of chip U300 is connected to the TX pin of the AN9 pin of the MCU module. The CANH pin of chip U300 serves as the CANH interface, the CANL pin of chip U300 serves as the CANL interface, and the CANH and CANL interfaces together form the CAN interface. A resistor R300 is connected in parallel between the CANL and CANH pins of chip U300. The RS4 pin of the MCU module is also connected to a generator output voltage detection unit. The RA2 pin of the MCU module is also connected to a generator rotor speed detection unit. The RC6 pin of the MCU module is also connected to an indicator light error-proofing unit. The RC2 pin of the MCU module is also connected to the generator excitation current regulation unit.

[0023] This application is an improvement upon the digital automotive alternator intelligent regulator with application number "CN20B13697A". The original application only described the application of CAN bus, but did not describe the specific circuit structure. The original application described a LIN bus connection method. This application uses a CAN bus connection method. Compared with the communication speed of LIN bus (around 100Kb / s), the communication speed of CAN bus can reach 1Mb / s, which can transmit vehicle fault detection faster and transmit physical signals in the alternator in real time and stably. Through the alternator output voltage detection unit, alternator rotor speed detection unit, and alternator excitation current regulation unit, the alternator output voltage signal and rotor speed signal can be obtained in real time. At the same time, the excitation current can be better controlled and regulated, and various problems can be fed back to the vehicle computer. The indicator light error prevention unit can output the problem in the form of indicator lights.

[0024] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0025] In the embodiments provided by this invention, it should be understood that the disclosed apparatus / terminal devices and methods can be implemented in other ways. For example, the apparatus / terminal device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings or direct couplings or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0026] The above are merely 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 within the protection scope of the present invention.

Claims

1. A voltage variable generator voltage regulator having a single-wire CAN bus function, comprising an MCU module, characterized in that, The MCU module is externally connected with the electronic control unit of the vehicle through a communication unit, the communication unit comprises a chip U300, a communication end of the chip U300 is connected with the MCU module, an interface end of the chip U300 is a CAN interface, and the electronic control unit is connected with the interface end; an RS4 pin of the MCU module is further connected with a generator output voltage detection unit; and an RA2 pin of the MCU module is further connected with a generator rotor rotating speed detection unit.

2. The voltage-variable generator voltage regulator having a single-wire CAN bus function according to claim 1, characterized by, A TXD pin of the chip U300 is connected with an AN9 pin of the MCU module, and an RXD pin of the chip U300 is connected with a TX pin of the MCU module.

3. The voltage-variable generator voltage regulator having a single-wire CAN bus function according to claim 1, characterized by, A CANH pin of the chip U300 is used as a CANH interface, and a CANL pin of the chip U300 is used as a CANL interface; the CANH interface and the CANL interface are used as the CAN interface.

4. The voltage-variable generator voltage regulator having a single-wire CAN bus function according to claim 3, characterized by, A resistance R300 is connected in parallel between the CANL pin of the chip U300 and the CANH pin of the chip U300.

5. The voltage-variable generator voltage regulator having a single-wire CAN bus function according to claim 1, characterized by, An RC6 pin of the MCU module is further connected with an indicator light error prevention unit.

6. The voltage-variable generator voltage regulator having a single-wire CAN bus function according to claim 1, characterized by, An RC2 pin of the MCU module is further connected with a generator excitation current adjusting unit.

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