CN216901385U

CN216901385U - Electronic control unit

Info

Publication number: CN216901385U
Application number: CN202123384435.5U
Authority: CN
Inventors: 薛飞; 蔡巍巍
Original assignee: Continental Automotive Research & Development Chongqing Co ltd
Current assignee: Continental Automotive Research & Development Chongqing Co ltd
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-07-05
Anticipated expiration: 2031-12-29

Abstract

An electronic control unit comprises a shell assembly and a printed circuit board assembly, wherein an accommodating cavity is formed in the shell assembly, the printed circuit board assembly is arranged in the accommodating cavity, the printed circuit board assembly comprises a printed circuit board, a plurality of microcontrollers and a LIN transceiver, the microcontrollers and the LIN transceiver are arranged on the printed circuit board, and the microcontrollers are respectively connected with the LIN transceiver to receive and/or transmit LIN bus signals through the LIN transceiver. The electronic control unit has the advantages of small area of a required Printed Circuit Board (PCB), low cost and the like.

Description

Electronic control unit

Technical Field

The utility model relates to the technical field of automobile electronics, in particular to an electronic control unit.

Background

A lin (local Interconnect network) bus is widely used for communication between slave nodes such as a door controller, a sunroof controller, and a wiper controller in a vehicle and master nodes such as a gateway and a Body Control Module (BCM). With the development of automotive electronics, there is a trend to integrate several Electronic Control Units (ECUs) into one ECU. For example, four door controllers are merged into one electronic control unit, and four doors are controlled by the electronic control unit. However, the current fusion method is to simply piece together the components of several electronic control units into one electronic control Unit, which includes a plurality of Microcontrollers (MCUs) and a plurality of LIN transceivers. Obviously, this way of fusion is costly.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electronic control unit, which has the advantages of small required Printed Circuit Board (PCB) area, low cost and the like.

In order to solve the above problems, the present invention provides an electronic control unit, which includes a housing assembly and a printed circuit board assembly, wherein a receiving cavity is formed inside the housing assembly, the printed circuit board assembly is disposed in the receiving cavity, the printed circuit board assembly includes a printed circuit board, a plurality of microcontrollers and a LIN transceiver, the plurality of microcontrollers and the LIN transceiver are disposed on the printed circuit board, and the plurality of microcontrollers are respectively connected to the LIN transceiver to receive and/or transmit a LIN bus signal through the LIN transceiver.

Compared with the prior art, the scheme has the following advantages:

the data fusion point of the multi-channel LIN bus in the electronic control unit is arranged at the front end of the LIN transceiver, so that N-1 LIN transceivers and N-1 pull-up resistors can be saved for N-channel LIN buses, and the cost is reduced. At the same time, with fewer LIN transceivers, the correspondingly smaller required printed circuit board area, further reduces costs.

Drawings

FIG. 1 illustrates a schematic diagram of a prior art fused electronic control unit;

FIG. 2 illustrates an exploded view of an electronic control unit in accordance with one or more embodiments of the utility model;

FIG. 3 illustrates a schematic diagram of a printed circuit board assembly in accordance with one or more embodiments of the utility model;

FIG. 4 illustrates a schematic diagram of an electronic control unit in accordance with one or more embodiments of the utility model.

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. Furthermore, it should be understood that the utility model is not limited to the specific embodiments described. Rather, it is contemplated that the utility model may be practiced with any combination of the following features and elements, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and should not be considered elements or limitations of the claims except where explicitly recited in a claim.

Fig. 1 illustrates a schematic diagram of a conventional integrated electronic control unit. Referring to fig. 1, the integrated electronic control unit includes four microcontrollers 10-1 to 10-4, four LIN transceivers 20-1 to 20-4, and four pull-up resistors R1 to R4. The chip select port of the microcontroller 10-1 is connected to the sleep port SLP of the LIN transceiver 20-1 to control sleep and wake-up of the LIN transceiver 20-1. The data output port of microcontroller 10-1 is connected to data transmit port TXD of LIN transceiver 20-1 to transmit the LIN bus signal through LIN transceiver 20-1. The data receiving port of the microcontroller 10-1 is connected with the data receiving port RXD of the LIN transceiver 20-1 to receive data on the LIN bus through the LIN transceiver 20-1. The data transfer port of LIN transceiver 20-1 is connected to pull-up resistor R1. The connections of microcontroller 10-2, LIN transceiver 20-2 and pull-up resistor R2, microcontroller 10-3, LIN transceiver 20-3 and pull-up resistor R3, and microcontroller 10-4, LIN transceiver 20-4 and pull-up resistor R4 are similar to the connections of microcontroller 10-1, LIN transceiver 20-1 and pull-up resistor R1 and will not be described further herein. The data transmission ports LIN of the LIN transceivers 20-1, 20-2, 20-3 and 20-4 are respectively connected with the LIN IO ports of the fusion electronic control unit. That is, four LIN transceivers 20-1 to 20-4 share one LIN IO port. It can be seen that each LIN bus in such a fused electronic control unit needs to be provided with one LIN transceiver, i.e., several LIN buses need several LIN transceivers, and this fusion method is relatively costly. In view of this problem, the inventors of the present invention have proposed a way to reduce the cost by completing signal fusion through a pre-connection and then completing the joint output of multiple signals by using one LIN transceiver. Specific implementations are described below.

FIG. 2 illustrates an exploded view of an electronic control unit in accordance with one or more embodiments of the utility model. Referring to fig. 2, the electronic control unit 100 includes a housing Assembly 110 and a Printed Circuit Board Assembly (PCBA) 120. The housing assembly 110 includes a first housing 111 and a second housing 112. The first housing 111 and the second housing 112 cooperate with each other to form an accommodating chamber. That is, the housing assembly 110 is internally formed with a receiving chamber. The printed circuit board assembly 120 is disposed in the receiving cavity of the housing assembly 110.

Fig. 3 illustrates a schematic diagram of a printed circuit board assembly in accordance with one or more embodiments of the utility model. FIG. 4 illustrates a schematic diagram of an electronic control unit in accordance with one or more embodiments of the utility model. Where the ports of the different devices in fig. 4 have the same reference numerals indicating that these ports are connected to each other, for example, a port of the microcontroller 122-1 is labeled "a", a port of the first gate circuit 124 is also labeled "a", indicating that this a port of the microcontroller 122-1 is connected to the a port of the first gate circuit 124, and for example, a port of the microcontroller 122-1 is labeled "a", a port of the second and circuit 125 is also labeled "a", indicating that this a port of the microcontroller 122-1 is connected to the a port of the second and circuit 125, and so on, will not be described again.

Referring collectively to fig. 3 and 4, the printed circuit board assembly 120 includes a printed circuit board 121, four microcontrollers 122-1-122-4, and a LIN transceiver 123. Four microcontrollers 122-1 to 122-4 and a LIN transceiver 123 are disposed on the printed circuit board 121. The four microcontrollers 122-1 to 122-4 are each connected to the LIN transceiver 123 for receiving and/or transmitting LIN bus signals via the LIN transceiver 123. It should be noted that, although the printed circuit board assembly 120 includes four microcontrollers 122-1-122-4 in the embodiment shown in fig. 3, it is understood that the number of microcontrollers is not limited by the utility model, and may be any number, such as 2, 3, 5 or more.

As described above, the data fusion point of the multiple LIN buses in the electronic control unit 100 of the present invention is set at the front end of the LIN transceivers, so that for N LIN buses, N-1 LIN transceivers can be saved, and the cost is reduced. At the same time, with fewer LIN transceivers, the correspondingly smaller required printed circuit board area, further reduces costs.

In one or more embodiments, printed circuit board assembly 120 also includes a first gate 124. The input end of the first gate circuit 124 is connected to the chip select ports of the four microcontrollers 122-1 to 122-4, respectively, and the output end of the first gate circuit 124 is connected to the sleep port SLP of the LIN transceiver 123. In one or more embodiments, the first gate circuit 124 is a first or gate circuit, and the chip select ports of the four microcontrollers 122-1-122-4 are configured to be active high, i.e., the chip select ports of the microcontrollers wake up the LIN transceiver 123 when they output high, and the LIN transceiver 123 goes to sleep only when all the chip select ports of the four microcontrollers 122-1-122-4 are low. In one or more embodiments, the first gate circuit 124 is a first and circuit, and the chip select ports of the four microcontrollers 122-1-122-4 are configured to be active low, i.e., the chip select ports of the microcontrollers wake up the LIN transceiver 123 when they output low, and the LIN transceiver 123 goes to sleep only when all the chip select ports of the four microcontrollers 122-1-122-4 are high.

In one or more embodiments, the printed circuit board assembly 120 further includes a second and circuit 125. The input end of the second and-gate circuit 125 is connected to the data transmission ports of the four microcontrollers 122-1 to 122-4, respectively, and the output end of the second and-gate circuit 125 is connected to the data transmission port TXD of the LIN transceiver 123. Since the default level of the data transmission ports of the microcontrollers is a high level, when one microcontroller pre-transmits LIN data, the data transmission ports of the other microcontrollers are the default high level, and after the and operation is performed on the levels of the data transmission ports of the plurality of microcontrollers by the second and circuit 125, the output level is the level of the data transmission port of the microcontroller that is pre-transmitting LIN data, so that the LIN data pre-transmitted by the microcontroller can be correctly transmitted to the data transmission port TXD of the LIN transceiver 123.

In one or more embodiments, the data receiving port RXD of the LIN transceiver 123 is connected to the data receiving ports of the four microcontrollers 122-1-122-4, respectively. That is, the data receiving ports of the four microcontrollers 122-1 through 122-4 may receive LIN data from the data receiving port RXD of the LIN transceiver 123, respectively.

In one or more embodiments, the LIN data transmission port LIN of the LIN transceiver 123 connects a pull-up resistor. Since the electronic control unit 100 of the present invention only includes one LIN transceiver 123 and accordingly only needs one pull-up resistor R, compared to the fusion mode shown in fig. 1, for an N-way LIN bus, this embodiment can save N-1 pull-up resistors and reduce the cost.

The LIN data transmission port LIN of the LIN transceiver 123 is also connected to a LIN IO port of the electronic control unit 100 to communicate with an external device LIN through the LIN IO port.

In one or more embodiments, the electronic control unit 100 is a slave node in the LIN network. The master node may be, for example, a gateway, a body control module, or the like. In one or more embodiments, the electronic control unit 100 is a door controller.

In addition, it should be noted that since the signal levels of the multiple LIN buses in the electronic control unit 100 are the same in type and the LIN buses strictly comply with the scheduling rules for scheduling, the multiple LIN buses do not generate commands or level conflicts, and there is no interference between them.

Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from this disclosure, and it is intended that the scope of the present invention be defined by the appended claims.

Claims

1. An electronic control unit, characterized by, including casing subassembly and printed circuit board subassembly, the inside of casing subassembly is formed with holds the chamber, the printed circuit board subassembly set up in hold the intracavity, the printed circuit board subassembly includes printed circuit board, a plurality of microcontrollers and a LIN transceiver, a plurality of microcontrollers with the LIN transceiver set up in on the printed circuit board, a plurality of microcontrollers respectively with the LIN transceiver is connected in order to receive and/or send LIN bus signal through the LIN transceiver.

2. The electronic control unit of claim 1, wherein said printed circuit board assembly further comprises a first or gate circuit or a first and gate circuit, an input of said first or gate circuit or said first and gate circuit being connected to a chip select port of said plurality of microcontrollers, respectively, an output of said first or gate circuit or said first and gate circuit being connected to a sleep port of said LIN transceiver.

3. The electronic control unit according to claim 1 or 2, wherein said printed circuit board assembly further comprises a second and-gate circuit, an input terminal of said second and-gate circuit being connected to the data transmission ports of said plurality of microcontrollers, respectively, and an output terminal of said second and-gate circuit being connected to the data transmission port of said LIN transceiver.

4. The electronic control unit according to claim 1 or 2, wherein the data receiving ports of the LIN transceivers are connected with the data receiving ports of the plurality of microcontrollers, respectively.

5. The electronic control unit according to claim 1 or 2, wherein a LIN data transmission port of the LIN transceiver is connected with a pull-up resistor.

6. An electronic control unit according to claim 1 or 2, characterized in that the electronic control unit is a slave node in a LIN network.

7. An electronic control unit according to claim 1 or 2, characterized in that the electronic control unit is a door controller.