CN109017631A - The sensor ground protection circuit of Vehicle Controller - Google Patents
The sensor ground protection circuit of Vehicle Controller Download PDFInfo
- Publication number
- CN109017631A CN109017631A CN201810681848.3A CN201810681848A CN109017631A CN 109017631 A CN109017631 A CN 109017631A CN 201810681848 A CN201810681848 A CN 201810681848A CN 109017631 A CN109017631 A CN 109017631A
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- China
- Prior art keywords
- interface
- vehicle controller
- sensor ground
- protection circuit
- sensor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention provides a kind of sensor ground protection circuits of Vehicle Controller; including switch element, sample circuit, first interface and second interface; wherein: the sample circuit connects the sensor ground wire; electric current on the sensor ground wire is detected; voltage signal is obtained, and is sent to the first interface；The first interface and the second interface are the interface of the main control chip of the Vehicle Controller, and the main control chip is detected and judged to the voltage signal；If the voltage signal is in normal range (NR), the main control chip controls the second interface and exports Continuity signal, and the Continuity signal makes the switching elements conductive；If the voltage signal is in fault coverage, the main control chip controls the second interface and exports cut-off signal, and the cut-off signal disconnects the switch element；The switch element is connected between the ground level and the sensor ground wire.
Description
Technical field
The present invention relates to technical field of vehicle control, in particular to the sensor ground wire of a kind of Vehicle Controller protects electricity
Road.
Background technique
Cabling of the sensor ground wire 100 of Vehicle Controller 300 on the printed circuit board inside Vehicle Controller at present
It is mostly ground level 200 to be directly connected to by the pin of connector using as shown in Figure 1, or " insure using as shown in Figure 2
The cabling mode of silk " formula is connected to ground level 200.In the large-scale use of Vehicle Controller 300, can exist in overall wire sheaves
The case where sensor ground wire 100 is shorted to power supply.
If the sensor ground wire 100 of Vehicle Controller 300 is using connection type as shown in Figure 1, due to sensor
Ground wire 100 is directly to ground level 200, so this design may bear high current, and much larger than positioned at vehicle-mounted control
The current capacity of sensor harness outside device 300 processed, thus presence is so that external sensor harness kindling even vehicle
The risk of fire.And the cabling design of Fig. 2 " fuse " formula, so that in the case that sensor ground wire 100 is shorted to power supply, although not
There can be the risk of external sensor harness or vehicle kindling, but there can be the sensor ground wire 100 inside Vehicle Controller 300
The risk being blown, once the sensor ground wire 100 inside Vehicle Controller 300 is blown, Vehicle Controller 300 can entirely be lost
It imitates and is discarded.
Summary of the invention
The purpose of the present invention is to provide a kind of sensor ground protection circuits of Vehicle Controller, to solve in sensor
In the case where earth short to power supply, existing sensor harness kindling or the problem of make entire Vehicle Controller fail.
In order to solve the above technical problems, the present invention provides a kind of sensor ground protection circuit of Vehicle Controller, it is described
The sensor ground protection circuit of Vehicle Controller is located on the printed circuit board of a Vehicle Controller, the Vehicle Controller
Sensor ground protection circuit is connected between ground level and sensor ground wire, including switch element, sample circuit, first interface
And second interface, in which:
The sample circuit connects the sensor ground wire, detects, obtains to the electric current on the sensor ground wire
Voltage signal, and it is sent to the first interface；
The first interface and the second interface are the interface of the main control chip of the Vehicle Controller, the master control core
Piece is detected and is judged to the voltage signal；
If the voltage signal is in normal range (NR), the main control chip controls the second interface output conducting letter
Number, the Continuity signal makes the switching elements conductive；
If the voltage signal is in fault coverage, the main control chip controls the second interface output and disconnects letter
Number, the cut-off signal disconnects the switch element；
The switch element is connected between the ground level and the sensor ground wire.
Optionally, in the sensor ground protection circuit of the Vehicle Controller, the sample circuit includes first
Resistance and second resistance, in which:
Described first resistor one end connects the sensor ground wire, and the other end connects the first interface；
Described second resistance one end connects the ground level, and the other end connects the first interface.
Optionally, in the sensor ground protection circuit of the Vehicle Controller, the sensing of the Vehicle Controller
Device ground protection circuit further includes first capacitor, in which:
Described first capacitor one end connects the ground level, and the other end connects the first interface.
Optionally, in the sensor ground protection circuit of the Vehicle Controller, the first interface includes modulus
The voltage signal is converted to digital signal by conversion circuit, analog-digital conversion circuit as described.
Optionally, in the sensor ground protection circuit of the Vehicle Controller, the second interface is master control core
The port I/O of piece.
Optionally, in the sensor ground protection circuit of the Vehicle Controller, the switch element includes metal-
Oxide semiconductor field effect transistor.
Optionally, in the sensor ground protection circuit of the Vehicle Controller, the Metal-Oxide Semiconductor
Field effect transistor has the function of current-limiting protection and Thermal shutdown.
Optionally, in the sensor ground protection circuit of the Vehicle Controller, the Metal-Oxide Semiconductor
Field effect transistor will flow through the current limit of itself in first threshold.
Optionally, in the sensor ground protection circuit of the Vehicle Controller, the Metal-Oxide Semiconductor
The heat of field effect transistor is more than second threshold, and the Metal-Oxide Semiconductor field effect transistor disconnects.
In the sensor ground protection circuit of Vehicle Controller provided by the invention, sensing is set up by switch element
The connection of device ground wire and ground level, while current sample is carried out to sensor ground wire, according to the current control on sensor ground wire
The problem of whether sensor ground wire and ground level connect, and not only can solve harness kindling or Vehicle Controller damage, can also expire
The requirement of the high functional safety grade of sufficient road vehicle Functional Safety Standard.
Detailed description of the invention
Fig. 1 is the sensor earthed circuit schematic diagram of an existing Vehicle Controller；
Fig. 2 is the sensor earthed circuit schematic diagram of another existing Vehicle Controller；
Fig. 3 is the sensor ground protection circuit schematic diagram of the Vehicle Controller in one embodiment of the invention；
It is as shown in the figure: 100- sensor ground wire；200- ground level；300- Vehicle Controller；400- switch element；500-
One interface；600- second interface.
Specific embodiment
Below in conjunction with the drawings and specific embodiments to the sensor ground protection circuit of Vehicle Controller proposed by the present invention
It is described in further detail.According to following explanation and claims, advantages and features of the invention will be become apparent from.It should be noted
It is that attached drawing is all made of very simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating this hair
The purpose of bright embodiment.
Core of the invention thought is to provide a kind of sensor ground protection circuit of Vehicle Controller, to solve passing
In the case where sensor earth short to power supply, existing sensor harness kindling or the problem of make entire Vehicle Controller fail.
To realize above-mentioned thought, the present invention provides a kind of sensor ground protection circuit of Vehicle Controller, the vehicles
The sensor ground protection circuit of set controller is located on the printed circuit board of a Vehicle Controller, the biography of the Vehicle Controller
Sensor ground protection circuit is connected between ground level and sensor ground wire, including switch element, sample circuit, first interface and
Second interface, in which: the sample circuit connects the sensor ground wire, examines to the electric current on the sensor ground wire
It surveys, obtains voltage signal, and be sent to the first interface；The first interface and the second interface are the vehicle-mounted control
The interface of the main control chip of device, the main control chip are detected and are judged to the voltage signal；If at the voltage signal
In in normal range (NR), then the main control chip controls the second interface and exports Continuity signal, and the Continuity signal makes described open
Close element conductive；If the voltage signal is in fault coverage, it is disconnected that the main control chip controls the second interface output
ON signal, the cut-off signal disconnect the switch element；The switch element is connected to the ground level and the sensing
Between device ground wire.
As shown in figure 3, the embodiment of the present invention provides a kind of sensor ground protection circuit of Vehicle Controller, the vehicle
The sensor ground wire 100 of set controller 300 protects circuit to be located on the printed circuit board of a Vehicle Controller 300, described vehicle-mounted
The protection of sensor ground wire 100 of controller 300 is electrically connected between ground level 200 and sensor ground wire 100, including switch member
Part 400, sample circuit, first interface 500 and second interface 600, in which: the sample circuit connects the sensor ground wire
100, the electric current on the sensor ground wire 100 is detected, voltage signal is obtained, and is sent to the first interface 500；
The first interface 500 and the second interface 600 are the interface of the main control chip of the Vehicle Controller 300, the master control
Chip is detected and is judged to the voltage signal；If the voltage signal is in normal range (NR), the main control chip
It controls the second interface 600 and exports Continuity signal, the switch element 400 is connected in the Continuity signal；If the voltage
Signal is in fault coverage, then the main control chip controls the second interface 600 and exports cut-off signal, the cut-off signal
Disconnect the switch element 400；The switch element 400 be connected to the ground level 200 and the sensor ground wire 100 it
Between.
Specifically, the sample circuit includes first in the sensor ground protection circuit of the Vehicle Controller
Resistance R1 and second resistance R2, in which: the one end the first resistor R1 connects the sensor ground wire 100, and the other end connects institute
State first interface 500；The one end the second resistance R2 connects the ground level 200, and the other end connects the first interface 500.
It further includes first capacitor C1 that the sensor ground wire 100 of the Vehicle Controller 300, which protects circuit, in which: the first capacitor C1
One end connects the ground level 200, and the other end connects the first interface 500.The first interface 500 includes analog-to-digital conversion electricity
The voltage signal is converted to digital signal by road, analog-digital conversion circuit as described.The second interface 600 is the I/ of main control chip
O port.
In addition, the switch element 400 includes gold in the sensor ground protection circuit of the Vehicle Controller
Category-oxide semiconductor field effect transistor, specifically, being intelligence MOSFET.The Metal-Oxide Semiconductor field-effect is brilliant
Body pipe has the function of current-limiting protection and Thermal shutdown.The Metal-Oxide Semiconductor field effect transistor will flow through the electricity of itself
Stream is limited in first threshold.The heat of the Metal-Oxide Semiconductor field effect transistor is more than second threshold, the gold
Category-oxide semiconductor field effect transistor disconnects.The sensor ground protection circuit of Vehicle Controller in the present invention has
Two kinds of protection mechanisms of software and hardware.
In the case where system normally connects and Vehicle Controller 300 powers on, the analog-to-digital conversion interface of main control chip can be right
Sensor ground wire 100 carries out current sample, and the voltage signal that normal condition is down sampled to is low level, and main control chip can control I/
O port makes intelligent MOSFET in the conductive state, so that sensor ground wire 100 and ground level 200 establish effectively
Connection.
When sensor ground wire 100 is shorted to power supply, there are two kinds of protection mechanisms of software and hardware.
Software protection are as follows: when being shorted to power supply, the analog-to-digital conversion interface of main control chip is with can detecting sensor
The voltage of line 100 is increasing, and when being greater than certain threshold value, main control chip can control the port I/O and intelligent MOSFET is in disconnection
State, so that sensor ground wire 100 and ground level 200 disconnect.
Hardware protection mechanism are as follows: the present invention is using intelligent MOSFET, and intelligence MOSFET usually there is current limliting to protect
The functions such as shield and Thermal shutdown, when being shorted to power supply, intelligent MOSFET can be by short circuit current limit value in certain range
It is interior, and after reaching certain heat, intelligence MOSFET can enter Thermal shutdown state, thus by sensor ground wire and ground level
It disconnects.
In normal use, software protection is typically used, in the case where software protection failure, hardware
Protection mechanism can also play a role, and provide a system to effective security mechanism.
In the sensor ground protection circuit of Vehicle Controller provided by the invention, set up by switch element 400
The connection of sensor ground wire 100 and ground level 200, while current sample is carried out to sensor ground wire 100, according to sensor ground wire
Whether current control sensor ground wire 100 and ground level 200 on 100 connect, through the invention in Vehicle Controller biography
Sensor ground protection circuit has two kinds of protection mechanisms of software and hardware, not only can solve harness kindling or Vehicle Controller
The problem of 300 damage, it can also meet the requirement of the high functional safety grade of road vehicle Functional Safety Standard.
To sum up, above-described embodiment has carried out specifically the various configuration of the sensor ground protection circuit of Vehicle Controller
Bright, certainly, the present invention includes but is not limited to configuration cited in above-mentioned implementation, any in configuration provided by the above embodiment
On the basis of the content that is converted, belong to the range that the present invention is protected.Those skilled in the art can be according to above-mentioned implementation
The content of example is drawn inferences about other cases from one instance.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (9)
1. a kind of sensor ground protection circuit of Vehicle Controller, the sensor ground protection circuit position of the Vehicle Controller
In on the printed circuit board of a Vehicle Controller, which is characterized in that the sensor ground protection circuit of the Vehicle Controller connects
It connects between ground level and sensor ground wire, including switch element, sample circuit, first interface and second interface, in which:
The sample circuit connects the sensor ground wire, detects to the electric current on the sensor ground wire, obtains voltage
Signal, and it is sent to the first interface；
The first interface and the second interface are the interface of the main control chip of the Vehicle Controller, the main control chip pair
The voltage signal is detected and is judged；
If the voltage signal is in normal range (NR), the main control chip controls the second interface and exports Continuity signal,
The Continuity signal makes the switching elements conductive；
If the voltage signal is in fault coverage, the main control chip controls the second interface and exports cut-off signal,
The cut-off signal disconnects the switch element；
The switch element is connected between the ground level and the sensor ground wire.
2. the sensor ground protection circuit of Vehicle Controller as described in claim 1, which is characterized in that the sample circuit
Including first resistor and second resistance, in which:
Described first resistor one end connects the sensor ground wire, and the other end connects the first interface；
Described second resistance one end connects the ground level, and the other end connects the first interface.
3. the sensor ground protection circuit of Vehicle Controller as described in claim 1, which is characterized in that the vehicle-mounted control
The sensor ground protection circuit of device further includes first capacitor, in which:
Described first capacitor one end connects the ground level, and the other end connects the first interface.
4. the sensor ground protection circuit of Vehicle Controller as described in claim 1, which is characterized in that the first interface
Including analog to digital conversion circuit, the voltage signal is converted to digital signal by analog-digital conversion circuit as described.
5. the sensor ground protection circuit of Vehicle Controller as described in claim 1, which is characterized in that the second interface
For the port I/O of main control chip.
6. the sensor ground protection circuit of Vehicle Controller as described in claim 1, which is characterized in that the switch element
Including Metal-Oxide Semiconductor field effect transistor.
7. the sensor ground protection circuit of Vehicle Controller as claimed in claim 6, which is characterized in that the metal-oxygen
Compound semiconductor field effect transistor has the function of current-limiting protection and Thermal shutdown.
8. the sensor ground protection circuit of Vehicle Controller as claimed in claim 7, which is characterized in that the metal-oxygen
Compound semiconductor field effect transistor will flow through the current limit of itself in first threshold.
9. the sensor ground protection circuit of Vehicle Controller as claimed in claim 7, which is characterized in that the metal-oxygen
The heat of compound semiconductor field effect transistor is more than second threshold, and the Metal-Oxide Semiconductor field effect transistor is disconnected
It opens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810681848.3A CN109017631B (en) | 2018-06-27 | 2018-06-27 | Sensor ground wire protection circuit of vehicle-mounted controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810681848.3A CN109017631B (en) | 2018-06-27 | 2018-06-27 | Sensor ground wire protection circuit of vehicle-mounted controller |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109017631A true CN109017631A (en) | 2018-12-18 |
| CN109017631B CN109017631B (en) | 2022-02-11 |
Family
ID=65520594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810681848.3A Active CN109017631B (en) | 2018-06-27 | 2018-06-27 | Sensor ground wire protection circuit of vehicle-mounted controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109017631B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112130017A (en) * | 2020-09-10 | 2020-12-25 | 厦门华联电子股份有限公司 | Testing device for variable frequency driver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112130017A (en) * | 2020-09-10 | 2020-12-25 | 厦门华联电子股份有限公司 | Testing device for variable frequency driver |
| CN112130017B (en) * | 2020-09-10 | 2024-05-10 | 厦门华联电子股份有限公司 | Testing device for variable frequency driver |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109017631B (en) | 2022-02-11 |
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