CN208818805U - A kind of vehicle parking brake switch detection circuit - Google Patents
A kind of vehicle parking brake switch detection circuit Download PDFInfo
- Publication number
- CN208818805U CN208818805U CN201821338874.8U CN201821338874U CN208818805U CN 208818805 U CN208818805 U CN 208818805U CN 201821338874 U CN201821338874 U CN 201821338874U CN 208818805 U CN208818805 U CN 208818805U
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- China
- Prior art keywords
- parking brake
- resistance
- brake switch
- module
- switch
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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.)
- Expired - Fee Related
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Abstract
The utility model relates to field of vehicle control, a kind of particularly vehicle parking brake switch detection circuit.The utility model discloses a kind of vehicle parking brake switch detection circuits, including parking brake switch module, switching signal division module, switch signal detection module and level switch module, the switching signal division module includes resistance R3, the parking brake switch module includes parking brake switch S1, the resistance R3 connects with parking brake switch S1 and is followed by between the first power supply and ground, node between the resistance R3 and parking brake switch S1 connects the input terminal of switch signal detection module, the input terminal of the output termination level switch module of the switch signal detection module, the control signal of the output termination controller of the level switch module.The utility model can overcome since hand brake device aging, contact resistance increase, and parking brake switch detection control circuit is led to problems such as erroneous judgement occur, fail to judge, and circuit structure is simple, at low cost, applied widely.
Description
Technical field
The utility model belongs to field of vehicle control, more particularly to a kind of vehicle parking brake switch detection circuit.
Background technique
According to the principle of arrangements for automotive doors control system: parking brake must pulled on and guaranteeing that parking brake good earth rear is remote-controlled
Switch gate；Prevent that vehicle from not coming to a complete stop and generation situations such as switch gate, driver's romote controlled locking leave rear car slipping, therefore, on automobile
Parking brake switch detection circuit will be equipped with to detect whether parking brake is pulled on.But existing parking brake switch detection circuit is all to pass through letter
Whether single detection low and high level is pulled on to judge that parking brake switchs, however when vehicle is placed for a long time；Or vehicle service life is longer,
It is long neglected and in disrepair；Or with vehicle bad environments, when sentencing moist environment, parking brake can be made to switch aging, contact resistance increases, and parking brake is opened
The both ends of pass form pressure drop and occur switching to pull on even if parking brake being also not good ground connection, that is, what is detected is not low level,
Existing parking brake switch detection circuit is caused erroneous judgement occur, fail to judge, so that door control system can not normal switch door.Only exist
It can be worked normally in the case where replacement parking brake, the maintenance cost of the client greatly increased.Many automobiles break down due to dimension
The difference of the professionalism of personnel is repaired, the root not gone wrong is searched, causes vehicle that cannot obtain in time correctly maintenance.
Summary of the invention
The purpose of this utility model is to provide a kind of vehicle parking brake switch detection circuits for solving above-mentioned ask
Topic.
To achieve the above object, the technical solution adopted in the utility model are as follows: a kind of vehicle parking brake switch detection circuit, packet
Include parking brake switch module, switching signal division module, switch signal detection module and level switch module, the switching signal point
Die block includes resistance R3, and the parking brake switch module includes parking brake switch S1, after the resistance R3 connects with parking brake switch S1
It connects between the first power supply and ground, the node between the resistance R3 and parking brake switch S1 connects the input of switch signal detection module
End, the input terminal of the output termination level switch module of the switch signal detection module, the output of the level switch module
Terminate the control signal of controller.
Further, first power supply is 24V power supply.
Further, the switching signal division module further includes diode D4, the resistance R3 and parking brake switch S1
Between node differential concatenation diode D4 connect the input terminal of switch signal detection module.
Further, the switch signal detection module includes resistance R6, resistance R4, resistance R9 and PNP triode Q1,
The base series resistor R6 of the PNP triode Q1 connects the anode of diode D4, and the emitter of the PNP triode Q1 connects first
Power supply, the collector series resistance R9 ground connection of the PNP triode Q1, the collector of the PNP triode Q1 connect level conversion
The input terminal of module, the resistance R4 connect between the emitter and base stage of PNP triode Q1.
Further, the switch signal detection module further includes capacitor C4, and the capacitor C4 is in parallel with resistance R4.
Further, the level switch module includes resistance R8, resistance R5 and NPN triode Q2, the NPN triode
The collector series resistance R5 of Q2 connects second source, and the node between the collector and resistance R5 of the NPN triode Q2 connects control
The control signal of device processed, the emitter ground connection of the NPN triode Q2, the base series resistor R8 of the NPN triode Q2
The collector of PNP triode Q1 is connect, is connected to capacitor C6 between the base stage and emitter of the NPN triode Q2.
Further, the second source is+5V power supply.
Further, the controller is MCU processor.
Further, the parking brake switch module further includes indicator light DS1, and the indicator light DS1 is serially connected in the first power supply
Between parking brake switch S1.
The advantageous effects of the utility model:
The utility model can overcome due to hand brake device aging, and contact resistance increase leads to parking brake switch detection control electricity
Road occur judge, fail to judge, and make door control system can not normal switch door the problem of, extend parking brake service life, reduction
Vehicle maintenance cost.
The utility model is without adjusting controller control software, and circuit is easy, and the development cycle is short, at low cost.
Level switch module is added in the utility model, is suitable for a variety of models, the electrical voltage system of different vehicle, the scope of application
Extensively.
Detailed description of the invention
Fig. 1 is the circuit block diagram of the utility model specific embodiment；
Fig. 2 is the circuit diagram of the utility model specific embodiment.
Specific embodiment
Now in conjunction with the drawings and specific embodiments, the present invention will be further described.
As illustrated in fig. 1 and 2, a kind of vehicle parking brake switch detection circuit, including parking brake switch module 1, switching signal partial pressure
Module 2, switch signal detection module 3 and level switch module 4, in this specific embodiment, the switching signal division module 2 is wrapped
Resistance R3 is included, the parking brake switch module 1 includes parking brake switch S1, and the resistance R3 connects with parking brake switch S1 and is followed by first
Between power supply and ground, for resistance R3 between parking brake switch S1 and the first power supply, resistance R3 and parking brake switch S1 constitute partial pressure electricity
Road, parking brake switch S1 will be assigned to different voltage with the difference of its contact resistance.
In this specific embodiment, the first power supply be Vehicular system power supply, specially 24V, certainly, in other embodiments,
It is also possible to other power supplys such as 12V.
In this specific embodiment, the switching signal division module 2 further includes diode D4, and the resistance R3 is opened with parking brake
Close the input terminal that the node differential concatenation diode D4 between S1 connects switch signal detection module 3.It is anti-that diode D4 plays prevention
It is acted on to conducting, improves circuit safety and reliability.
In this specific embodiment, switch signal detection module 3 includes resistance R6, resistance R4, resistance R9 and PNP triode
Q1, the level switch module 4 include resistance R8, resistance R5 and NPN triode Q2, the base series of the PNP triode Q1
Resistance R6 (input terminal of switch signal detection module 3) connects the anode of diode D4, and the emitter of the PNP triode Q1 connects
One power supply, the collector series resistance R9 ground connection of the PNP triode Q1, the resistance R4 connect the transmitting in PNP triode Q1
Between pole and base stage, the collector series resistance R5 of the NPN triode Q2 connects second source, the collection of the NPN triode Q2
Node between electrode and resistance R5 connects the control signal of controller 5, and the emitter ground connection of the NPN triode Q2 is described
The base series resistor R8 of NPN triode Q2 connects the collector of PNP triode Q1, the base stage and transmitting of the NPN triode Q2
Capacitor C6 is connected between pole.
In this specific embodiment, the controller 5 is MCU processor, and the second source is+5V power supply, certainly, at it
In its embodiment, for second source depending on the working power of controller 5, this is that those skilled in the art can realize easily
, no longer describe in detail.
By level switch module 4, so that the utility model can be adapted for a variety of models, the voltage system of different vehicle
System, it is applied widely.
In this specific embodiment, the switch signal detection module 3 further includes capacitor C4, and the capacitor C4 and resistance R4 are simultaneously
Connection.
In this specific embodiment, the parking brake switch module 1 further includes indicator light DS1, and the indicator light DS1 is serially connected in
Between one power supply and parking brake switch S1.
Detection process:
Enter working condition, the indicator light when parking brake switch S1 is closed state (pulling on parking brake) after system electrification
DS1 is lighted, when parking brake indicator light DS1 extinguishes parking brake switch S1 in the open mode, intuitively to user's instruction parking brake switch
State.
When parking brake switch S1 is in closed state, resistance R3 and parking brake switch S1 constitute bleeder circuit, and parking brake switch S1 will
Distribute different voltage with the difference of its contact resistance, but below 24V, PNP triode Q1 conducting, export high level to
(resistance R3 should be the biggish resistance of resistance value, so that the pressure drop that parking brake switch S1 divides for NPN triode Q2, NPN triode Q2 conducting
It is as small as possible, guarantee that PNP triode Q1 can be connected), low level is exported to MCU processor 5, and MCU processor 5 detects low electricity
Flat (0V)；When parking brake switch S1 in the open mode, PNP triode Q1 disconnect, export low level and give NPN triode Q2, NPN tri-
Pole pipe Q2 is disconnected, and exports high level to MCU processor 5, and MCU processor 5 detects high level, and MCU processor 5 is high by detection
Low level is that can determine whether the state of parking brake switch, and then carry out corresponding Car's door controlling, so as to overcome due to hand brake device
Aging, contact resistance increase causes parking brake switch detection control circuit appearance judge by accident, fail to judge, and makes door control system can not
The problem of normal switch door, extends parking brake service life, reduces vehicle maintenance cost, and without adjusting controller control software,
Circuit is easy, and the development cycle is short, at low cost, applied widely.
The utility model can also be used for other devices for needing detection switch, such as gear detection, need to only switch parking brake
S1 changes driving switch into.
Although specifically showing and describing the utility model in conjunction with preferred embodiment, those skilled in the art is answered
This is understood, in the spirit and scope for not departing from the utility model defined by the appended claims, in form and details
On the utility model can be made a variety of changes, be the protection scope of the utility model.
Claims (9)
1. a kind of vehicle parking brake switch detection circuit, it is characterised in that: including parking brake switch module, switching signal division module,
Switch signal detection module and level switch module, the switching signal division module include resistance R3, the parking brake switching molding
Block includes parking brake switch S1, and the resistance R3 connects with parking brake switch S1 and is followed by between the first power supply and ground, the resistance R3
Node between parking brake switch S1 connects the input terminal of switch signal detection module, the output end of the switch signal detection module
Connect the input terminal of level switch module, the control signal of the output termination controller of the level switch module.
2. vehicle parking brake switch detection circuit according to claim 1, it is characterised in that: first power supply is 24V electricity
Source.
3. vehicle parking brake switch detection circuit according to claim 2, it is characterised in that: the switching signal division module
It further include diode D4, the node differential concatenation diode D4 between the resistance R3 and parking brake switch S1 connects switch signal detection
The input terminal of module.
4. vehicle parking brake switch detection circuit according to claim 3, it is characterised in that: the switch signal detection module
Diode is connect including resistance R6, resistance R4, resistance R9 and PNP triode Q1, the base series resistor R6 of the PNP triode Q1
The anode of D4, the emitter of the PNP triode Q1 meet the first power supply, the collector series resistance R9 of the PNP triode Q1
Ground connection, the collector of the PNP triode Q1 connect the input terminal of level switch module, and the resistance R4 connects in PNP triode Q1
Emitter and base stage between.
5. vehicle parking brake switch detection circuit according to claim 4, it is characterised in that: the switch signal detection module
It further include capacitor C4, the capacitor C4 is in parallel with resistance R4.
6. vehicle parking brake switch detection circuit according to claim 4 or 5, it is characterised in that: the level switch module
Second source is connect including resistance R8, resistance R5 and NPN triode Q2, the collector series resistance R5 of the NPN triode Q2, institute
The control signal that the node between the collector of NPN triode Q2 and resistance R5 connects controller is stated, the NPN triode Q2's
Emitter ground connection, the base series resistor R8 of the NPN triode Q2 connect the collector of PNP triode Q1, the NPN triode
Capacitor C6 is connected between the base stage and emitter of Q2.
7. vehicle parking brake switch detection circuit according to claim 6, it is characterised in that: the second source is+5V electricity
Source.
8. vehicle parking brake switch detection circuit according to claim 7, it is characterised in that: the controller is MCU processing
Device.
9. vehicle parking brake switch detection circuit according to claim 1, it is characterised in that: the parking brake switch module also wraps
Indicator light DS1 is included, the indicator light DS1 is serially connected between the first power supply and parking brake switch S1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821338874.8U CN208818805U (en) | 2018-08-20 | 2018-08-20 | A kind of vehicle parking brake switch detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821338874.8U CN208818805U (en) | 2018-08-20 | 2018-08-20 | A kind of vehicle parking brake switch detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208818805U true CN208818805U (en) | 2019-05-03 |
Family
ID=66273893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821338874.8U Expired - Fee Related CN208818805U (en) | 2018-08-20 | 2018-08-20 | A kind of vehicle parking brake switch detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208818805U (en) |
-
2018
- 2018-08-20 CN CN201821338874.8U patent/CN208818805U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190503 Termination date: 20210820 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |