Dual-CAN self-adaptive device and method of electric compressor controller

Abstract

The invention relates to the technical field of electric compressor control, in particular to a double-CAN self-adaption device and method of an electric compressor controller, the device comprises an 8Pin fool-proof low-voltage connector, a first CAN communication module, a second CAN communication module and a control module, the 8Pin fool-proof low-voltage connector integrates the communication functions of the first CAN communication module and the second CAN communication module, and the control module is connected with the 8Pin fool-proof low-voltage connector. The control module initializes the first CAN communication module and the second CAN communication module, and controls the corresponding CAN modules to send a first frame message based on vehicle CAN resistance demand identification or automatic detection, so that one hardware controller adapts to two vehicle types, detects a first frame ACK response and locks an adaptive path. The communication path is automatically locked according to the successful sending condition of the first frame message, so that one hardware controller is adaptive to two different CAN communication defined vehicle types, hardware modification is not needed, and the research and development investment, the inventory cost and the vehicle type adaptation period of customers are reduced.

Description

Technical Field

[0001] This invention relates to the field of electric compressor control technology, and in particular to a dual CAN adaptive device and method for electric compressor controllers. Background Technology

[0002] The existing electric compressor controller's CAN communication and hardware design suffer from three major pain points, severely restricting customer vehicle adaptation efficiency and cost control: The multi-connector design leads to complicated adaptation: In the traditional solution, two independent connectors are required for two CAN communication channels. This not only increases the number of openings in the controller housing and increases hardware costs, but also makes the wiring harness connection of the whole vehicle complicated (multiple sets of wiring harnesses need to be connected), which prolongs the assembly time. Moreover, multiple connectors are prone to poor contact due to vibration, which increases the risk of communication failure.

[0003] The single-connector CAN configuration lacks flexibility: existing single-connector solutions either contain only a single CAN channel (which cannot adapt to both "with and without resistor" vehicle models), or contain two CAN channels but use the "same resistor configuration" (which only solves the problem of redundancy backup and cannot match the CAN network terminal resistor requirements of different vehicle models).

[0004] High hardware customization costs and heavy inventory pressure: Traditional solutions require the development of two different hardware controllers (one with integrated resistors and one without resistors) for "vehicles with terminating resistors" and "vehicles without terminating resistors". This not only increases R&D investment (requiring two sets of hardware drawings and two certification tests), but also causes customers to keep two types of controllers in stock (to cope with different vehicle orders). The inventory turnover rate is low, the capital is tied up, and there is a risk of shortages of certain types of controllers and overstocking of others.

[0005] To address the aforementioned issues, there is an urgent need for a solution that integrates two differentiated CAN channels with a single connector and automatic routing for the first frame, thereby reducing customers' R&D and inventory costs. Summary of the Invention

[0006] The purpose of this invention is to provide a dual CAN adaptive device and method for electric compressor controllers, aiming to solve the problem that traditional electric compressor controllers require the development of two hardware versions to adapt to two different vehicle models, resulting in high costs.

[0007] To achieve the above objectives, in a first aspect, the present invention provides a dual CAN adaptive device for an electric compressor controller, comprising an 8-pin foolproof low-voltage connector, a first CAN communication module, a second CAN communication module, and a control module. The 8-pin foolproof low-voltage connector is connected to the first CAN communication module and the second CAN communication module, respectively, and the control module is connected to the first CAN communication module and the second CAN communication module, respectively. The 8-pin foolproof low-voltage connector is used to integrate the communication functions of the first CAN communication module and the second CAN communication module. The first CAN communication module is used to adapt to vehicle models that do not require terminating resistors; The second CAN communication module is used to adapt to vehicle models that require terminating resistors; The control module is used to initialize the first CAN communication module and the second CAN communication module, and control the corresponding CAN module to send the first frame message based on the vehicle CAN resistance requirement identifier or automatic detection, so as to realize that one hardware controller can adapt to two vehicle models, detect the first frame ACK response, and lock the adaptation path.

[0008] The core pins of the 8-pin foolproof low-voltage connector are defined as Pin4=can1h, Pin8=can1l, Pin1=can2h, and Pin6=can2l, with the rest being reserved pins. It also supports the connection of the wiring harnesses of the two vehicle models to different CAN pins.

[0009] The second CAN communication module integrates a 120Ω±1% terminating resistor.

[0010] In a second aspect, the present invention also provides a dual CAN adaptive method for an electric compressor controller, employing the dual CAN adaptive device for the electric compressor controller as described in the first aspect above, comprising the following steps: Start the controller, and the control module initializes the first CAN module and the second CAN module respectively; The control module controls the first CAN module and the second CAN module to send the first frame message through an 8-pin foolproof low-voltage connector. If the first frame message receives an ACK response and the CAN pin level is normal, lock the CAN that responded as the communication path; if the first frame fails, repeat the first frame message operation until any CAN receives an ACK response. After locking the communication path, compressor control messages are sent and received via the CAN bus of the communication path.

[0011] The present invention discloses a dual-CAN adaptive device for an electric compressor controller. Upon controller startup, the control module initializes the first CAN module and the second CAN module respectively. The control module controls the first CAN module and the second CAN module to send a first frame message through the 8-pin foolproof low-voltage connector. If the first frame message receives an ACK response and the CAN pin level is normal, the CAN path that responded is locked as the communication path. If the first frame fails, the first frame message sending operation is repeated until either CAN path receives an ACK response. After locking the communication path, compressor control messages are sent and received through the CAN of the communication path. This device integrates two differentiated CAN paths (one with a terminating resistor and one without) based on the 8-pin connector. It automatically locks the communication path based on the successful transmission of the first frame message, enabling a single hardware controller to adapt to two different CAN communication definitions for different vehicle models without hardware modifications. This reduces customer R&D investment, inventory costs, and vehicle adaptation cycle, thus solving the problem of high costs associated with developing two different hardware components for each type of electric compressor controller. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0013] Figure 1 This is a connection diagram of the dual CAN adaptive device for the electric compressor controller provided by the present invention.

[0014] Figure 2 This is a wiring diagram of the dual CAN adaptive device for the electric compressor controller provided by the present invention.

[0015] Figure 3 This is a logical schematic diagram of the dual CAN adaptive method for an electric compressor controller provided by the present invention.

[0016] Figure 4 This is a flowchart of the dual CAN adaptive method for an electric compressor controller provided by the present invention.

[0017] In the diagram: 1-8-pin foolproof low-voltage connector, 2-first CAN communication module, 3-second CAN communication module, 4-control module. Detailed Implementation

[0018] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0019] Please see Figures 1 to 2In a first aspect, the present invention provides a dual CAN adaptive device for an electric compressor controller, comprising an 8-pin foolproof low-voltage connector 1, a first CAN communication module 2, a second CAN communication module 3, and a control module 4. The 8-pin foolproof low-voltage connector 1 is connected to the first CAN communication module 2 and the second CAN communication module 3 respectively, and the control module 4 is connected to the first CAN communication module 2 and the second CAN communication module 3 respectively. The 8-pin foolproof low-voltage connector 1 is used to integrate the communication functions of the first CAN communication module 2 and the second CAN communication module 3. The first CAN communication module 2 is used to adapt to vehicle models that require no terminating resistor; The second CAN communication module 3 is used to adapt to vehicle models that require terminating resistors; The control module 4 is used to initialize the first CAN communication module 2 and the second CAN communication module 3, and control the corresponding CAN module to send the first frame message based on the vehicle CAN resistance requirement identifier or automatic detection, so as to realize that one hardware controller can adapt to two vehicle models, detect the first frame ACK response, and lock the adaptation path.

[0020] In this implementation, the controller is started, and the control module 4 initializes the first CAN module and the second CAN module respectively. The control module 4 controls the first CAN module and the second CAN module to send the first frame message through the 8-pin foolproof low-voltage connector 1. If the first frame message receives an ACK response and the CAN pin level is normal, the CAN one that responded is locked as the communication path. If the first frame fails, the operation of sending the first frame message is repeated until any CAN one receives an ACK response. After locking the communication path, the compressor control message is sent and received through the CAN of the communication path. This device integrates two differentiated CANs (one with a terminating resistor and one without) based on the 8-pin connector. The communication path is automatically locked based on the successful transmission of the first frame message, realizing that one hardware controller can adapt to two different CAN communication definitions for two vehicle models without hardware modification. This reduces the customer's R&D investment, inventory costs and vehicle adaptation cycle, thereby solving the problem that traditional electric compressor controllers need to develop two hardware to adapt to two vehicle models, which is costly.

[0021] Furthermore, the core pins of the 8-pin foolproof low-voltage connector 1 are defined as Pin4=can1h, Pin8=can1l, Pin1=can2h, and Pin6=can2l, with the rest being reserved pins. It also supports the connection of the wiring harnesses of the two vehicle models to different CAN pins.

[0022] Furthermore, the second CAN communication module 3 integrates a 120Ω±1% terminating resistor.

[0023] In this implementation, the second CAN communication module 3 integrates 120Ω±1% precision surface mount resistors (R1, R2) (soldered between CAN2_H and CAN2_L), adapting to vehicle models where "CAN network nodes require resistors" (such as commercial vehicles). Interface connection: It connects to the external wiring harness via connectors Pin2 and Pin4, and is completely independent of the second CAN module hardware, adapting to the corresponding vehicle models without removing or adding resistors.

[0024] The first CAN communication circuit module (CAN1, without terminating resistor): Resistor configuration: No terminating resistor is integrated, and a resistor pad is reserved (which can be soldered for very special vehicle models, but no modification is needed in normal scenarios), which is compatible with vehicle models that require "CAN network nodes without resistors" (such as passenger cars); Interface connection: It is connected to the external wiring harness through connectors Pin6 and Pin8, and shares the internal power supply and control module 4 of the controller with the first CAN module. The hardware structure is completely fixed and does not need to be adjusted for different vehicle models.

[0025] Please see Figures 3 to 4 Secondly, the present invention also provides a dual CAN adaptive method for an electric compressor controller, employing the dual CAN adaptive device for the electric compressor controller as described in the first aspect above, comprising the following steps: S1 starts the controller, and control module 4 initializes the first CAN module and the second CAN module respectively; In this embodiment of the invention, after the controller is started, the control module 4 synchronously initializes the first CAN module (CAN1) and the second CAN module (CAN2), with fixed hardware parameters, requiring no hardware adjustment by the customer.

[0026] S2 The control module 4 controls the first CAN module and the second CAN module to send the first frame message through the 8-pin foolproof low-voltage connector 1; S3 If the first frame message receives an ACK response and the CAN pin level is normal, lock the CAN that responded as the communication path; if the first frame fails, repeat the first frame message operation until any CAN receives an ACK response. In this embodiment of the invention, the MCU control program controls the two CAN channels to send empty data first frame messages respectively. It determines which of the two CAN channels is being used and connected to the normal CAN network by whether an ACK is received. This determines whether the vehicle needs a matching terminal resistor and identifies the vehicle model requirement in reverse. If an ACK is received, the matching is performed; if no ACK is received, the system switches to the other channel. The entire process requires no manual intervention or hardware modification.

[0027] After locking onto a compatible CAN module, the software actively stops the other unmatched CAN channel, and the controller can then send and receive messages normally through the compatible CAN module. If both CAN channels fail, the controller will continue to output the first frame of the message through both CAN channels until either CAN channel is connected.

[0028] After S4 locks the communication path, it transmits and receives compressor control messages via the CAN bus of the communication path.

[0029] To better understand this technical solution, the following embodiments are provided for further explanation: Hardware selection and 8-pin configuration Core hardware selection: All hardware (connectors, CAN transceivers, control module 4, resistors) has a fixed configuration. One set of hardware drawings corresponds to two vehicle models, so there is no need to adjust the selection or layout of components for different vehicle models.

[0030] 8-Pin Connector Pin Assignment Table:

[0031] Example 1 Customers produce commercial vehicles (with terminating resistors required). Connect the wiring harness to connectors Pin2 and Pin4 (CAN2). After the controller starts, it automatically sends the first frame through CAN1 and CAN2. It receives the ACK from CAN2 in 2ms, matches and locks to CAN2, and uses CAN2 to send and receive messages normally. Example

[0032] The customer manufactures passenger vehicles (which require no terminating resistors). The wiring harness is connected to connectors Pin6 and Pin8 (CAN1). After the controller starts, it automatically sends the first frame through CAN1 and CAN2 (CAN2 does not receive the ACK). It receives the ACK from CAN1 and locks it within 2ms. The first message is sent normally using CAN1. No hardware needs to be replaced. It is the same batch of controllers used in commercial vehicles.

[0033] Compared with the prior art, the present invention has the following advantages: Extremely improved hardware versatility, completely avoiding dual hardware development: one controller hardware is compatible with two CAN communication definition vehicle models. Customers do not need to purchase two different hardware controllers, reducing R&D costs by 50% (no need to develop two sets of hardware drawings and certification tests). Customers do not need to open new part numbers, two project teams can manage the project, and there is no need to conduct two rounds of DV / PV / vehicle road tests. Inventory costs are reduced by 40% (only one controller needs to be stocked to avoid stockpiling and shortages).

[0034] Customers experience improved production efficiency and greater flexibility in adaptability: Customer production lines do not need to distinguish between "controllers for vehicles with and without resistance" and the same batch of controllers can be randomly assigned to both types of vehicles, shortening production line changeover time; even if new vehicle models are added later (still one of the two CAN definitions), there is no need to change the controller hardware, reducing the adaptation cycle from "weeks" to "zero".

[0035] Specifically, R&D costs have been reduced by approximately 50%. Basis: Shared hardware + one-time certification No need for two sets of schematics / PCBs / structures / molds No need for two tests: DV test, PV test, EMC / safety / automotive certification No need for two full vehicle road tests, calibrations, and software adaptations In the industry, projects that completely reuse hardware can typically save 40%–60% on R&D investment, with 50% being the median.

[0036] Customers do not need to create new part numbers Basis: Hardware BOM is completely identical Automotive SOP process: Part number = new part = relocation / certification / warehousing / traceability.

[0037] The hardware remains unchanged → the part numbers remain unchanged → the supply chain system remains unchanged.

[0038] Merging the management of two project teams Basis: A single hardware platform supports multiple configurations / models. Originally, there were two projects: two hardware teams, two testing teams, two quality teams, and two project managers.

[0039] With shared hardware: a single hardware team is responsible for everything, with differences only in software / configuration.

[0040] No need for two-wheel DV / PV / vehicle road tests Basis: Automotive-grade development process (IATF16949+V model) DV: Design Validation PV: Production Validation With the hardware unchanged, only one DV / PV / road test is needed, and subsequent tests will only involve software / functional regression.

[0041] Inventory costs reduced by approximately 40%. Basis: Supply Chain & Logistics Inventory Model Only one type of controller is needed, eliminating the need to stock separate units for different models or different trim levels. Reduce the risks of stagnation, production stoppage, and material shortage. Reduce packaging, warehousing, turnover, and obsolete / scrap materials. In actual projects, combining multiple models into one can usually reduce inventory by 30%–50%, with 40% being a commonly used conservative value in the industry.

[0042] The above-disclosed embodiments are merely preferred embodiments of the dual CAN adaptive device and method for electric compressor controllers provided in this application, and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A dual CAN adaptive device for an electric compressor controller, characterized in that, It includes an 8-pin foolproof low-voltage connector, a first CAN communication module, a second CAN communication module, and a control module. The 8-pin foolproof low-voltage connector is connected to the first CAN communication module and the second CAN communication module, respectively, and the control module is connected to the first CAN communication module and the second CAN communication module, respectively. The 8-pin foolproof low-voltage connector is used to integrate the communication functions of the first CAN communication module and the second CAN communication module. The first CAN communication module is used to adapt to vehicle models that do not require terminating resistors; The second CAN communication module is used to adapt to vehicle models that require terminating resistors; The control module is used to initialize the first CAN communication module and the second CAN communication module, and control the corresponding CAN module to send the first frame message based on the vehicle CAN resistance requirement identifier or automatic detection, so as to realize that one hardware controller can adapt to two vehicle models, detect the first frame ACK response, and lock the adaptation path.

2. The dual CAN adaptive device for the electric compressor controller as described in claim 1, characterized in that, The core pins of the 8-pin foolproof low-voltage connector are defined as Pin4=can1h, Pin8=can1l, Pin1=can2h, and Pin6=can2l, with the rest being reserved pins. It also supports the connection of the wiring harnesses of the two vehicle models to different CAN pins.

3. The dual CAN adaptive device for the electric compressor controller as described in claim 1, characterized in that, The second CAN communication module integrates a 120Ω±1% terminating resistor.

4. A dual-CAN adaptive method for an electric compressor controller, employing the dual-CAN adaptive device for an electric compressor controller as described in any one of claims 1-3, characterized in that, Includes the following steps: Start the controller, and the control module initializes the first CAN module and the second CAN module respectively; The control module controls the first CAN module and the second CAN module to send the first frame message through an 8-pin foolproof low-voltage connector. If the first frame message receives an ACK response and the CAN pin level is normal, lock the CAN that responded as the communication path; if the first frame fails, repeat the first frame message operation until any CAN receives an ACK response. After locking the communication path, compressor control messages are sent and received via the CAN bus of the communication path.

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