CN107479543A - A kind of automobile safety components watchdog circuit - Google Patents
A kind of automobile safety components watchdog circuit Download PDFInfo
- Publication number
- CN107479543A CN107479543A CN201710909002.6A CN201710909002A CN107479543A CN 107479543 A CN107479543 A CN 107479543A CN 201710909002 A CN201710909002 A CN 201710909002A CN 107479543 A CN107479543 A CN 107479543A
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- signal input
- resistance
- input
- dog
- mcu
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0208—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the configuration of the monitoring system
- G05B23/0213—Modular or universal configuration of the monitoring system, e.g. monitoring system having modules that may be combined to build monitoring program; monitoring system that can be applied to legacy systems; adaptable monitoring system; using different communication protocols
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Debugging And Monitoring (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The invention discloses a kind of automobile safety components watchdog circuit, MCU is serially connected between vehicle body hardware signal input and the signal input part of automobile safety components；The feeding-dog signal input of MCU feeding-dog signal output end connection house dog, the reset signal output end of MCU reset signal input connection house dog；The signal input part of the signal input part connection vehicle body hardware signal input of house dog, the signal output part connection automobile safety components of house dog；The input signal of vehicle body hardware signal input is transferred to the signal input part of automobile safety components by house dog after feeding-dog signal input loses feeding-dog signal.Advantage is so that MCU operation irregularities and when being reset, related vehicle body security function can continue to run with, unaffected.The real-time of vehicle body security function, accuracy, controllability and continuation are efficiently solved, will not restart because of MCU reset and be ignored so that Body Control is more safe and reliable.
Description
Technical field
The present invention relates to a kind of watchdog circuit, more particularly to a kind of automobile safety components watchdog circuit.
Background technology
It is most of to use external control circuit in microcontroller work in the design of current body electronics watchdog circuit
MCU is resetted when making abnormal, allows system to rework.But there is following defect in this circuit:If the first, MCU resets,
The institute of bodywork system is functional to be all stopped；The 2nd, if MCU causes operation irregularity because of breaking down, then vehicle body system
System is constantly in reset state, and system institute is functional cannot effectively to be controlled all without recovery, particularly vehicle body security function, this
Sample has severe compromise.
The content of the invention
In order to solve the above-mentioned technical problem, present invention aims at provide a kind of automobile safety components watchdog circuit.
A kind of automobile safety components watchdog circuit of the present invention, including MCU, house dog and automobile safety components；
Unit is restarted in the monitoring that described house dog includes being used to monitoring and restarting MCU, and it is defeated that described MCU is serially connected in vehicle body hardware signal
Enter between end and the control signal input of automobile safety components；Unit is restarted in MCU feeding-dog signal output end connection monitoring
The reset signal output end of unit is restarted in the reset signal input connection monitoring of feeding-dog signal input, MCU；Its feature exists
In described house dog also includes control adapter unit；The signal input part connection vehicle body hardware letter of the control adapter unit
Number input, the control signal input of signal output part connection automobile safety components for controlling adapter unit, control adapter list
The feeding-dog signal input connection MCU of member feeding-dog signal output end；Described control adapter unit feeding-dog signal input loses
After removing feeding-dog signal, the input signal of vehicle body hardware signal input is transferred to the control of automobile safety components by control adapter unit
Signal input part processed.
Described house dog also includes first comparator, the second comparator, the first triode, the second triode, the three or three
Pole pipe, the first diode, the first electric capacity, driving chip and the second to the 11st resistance；Described first comparator homophase input
End will be inputted by the three, the 5th resistance concatenated after input voltage partial pressure, and inverting input will by the second, the 4th resistance concatenated
Inputted after input voltage partial pressure, wherein the ratio of the three, the 5th resistance is less than the ratio of the second, the 4th resistance；Described the 4th
The first triode is concatenated between resistance and ground, the first transistor base connects MCU feeding-dog signal output end；Described the two or three
Pole pipe radio pole connection input voltage, colelctor electrode connect the 3rd triode radio pole, the collector series connection the tenth of the 3rd triode
It is grounded after one resistance；Described first comparator output end connection MCU reset signal input and the base stage of the second triode；
Second transistor collector is grounded after being sequentially connected in series the 6th resistance and the 8th resistance, the connection of the 6th resistance and the 8th resistance
O'clock the in-phase input end of the second comparator is connected after the 7th resistance, tie point connects vehicle body hardware after just connecing the first diode
Signal input part；The reverse input end of the second described comparator is by the nine, the tenth resistance that concatenate by after input voltage partial pressure
Input, the output end of the second comparator connect the base stage of the 3rd triode；3rd transistor collector is connected by driving chip
The control signal input of automobile safety components；Inverting input and ground of the first described capacitance series in first comparator
Between.
Described driving chip is provided with overvoltage/over-current protecting unit, and described overvoltage/over-current protecting unit is preposition in automobile
The control signal input of safety component.
Described driving chip is provided with electrostatic protection unit, and described electrostatic protection unit is preposition in automobile safety components
Control signal input.
A kind of automobile safety components watchdog circuit of the present invention, it loses in house dog in feeding-dog signal input
After feeding-dog signal, the input signal of vehicle body hardware signal input can be transferred to the signal input part of automobile safety components, made
When obtaining MCU operation irregularities and being reset, related vehicle body security function can continue to run with, unaffected.Efficiently solve
The real-time of vehicle body security function, accuracy, controllability and continuation, it will not restart because of MCU reset and be ignored so that
Body Control is more safe and reliable.
Brief description of the drawings
Fig. 1 is the structural representation of automobile safety components watchdog circuit of the present invention；
Fig. 2 is the electrical block diagram of the control adapter unit of the house dog；
Reference：The diodes of D1- first, the electric capacity of C1- first, the triodes of Q1- first, the triodes of Q2- second, Q3- the three or three
Pole pipe, U1A- first comparators, the comparators of U2B- second, U3- driving chips, R2- second resistances, R3- 3rd resistors, R4-
Four resistance, the resistance of R5- the 5th, the resistance of R6- the 6th, the resistance of R7- the 7th, the resistance of R8- the 8th, the resistance of R9- the 9th, the electricity of R10- the tenth
Resistance, the resistance of R11- the 11st, the in-phase input end of V5- first comparators, the inverting input of V4- first comparators, V9- second
Input voltage, the input voltage of V8- the second comparator inverting inputs of comparator in-phase input end.
Embodiment
As shown in figure 1, a kind of automobile safety components watchdog circuit of the present invention, including detected MCU, detection
MCU house dog and controlled automobile safety components.Described house dog is connected with MCU electric signals, house dog monitoring MCU's
Feeding-dog signal, MCU working conditions back to normal are made to MCU transmissions reset signal after feeding-dog signal is lost.Described house dog
Restart unit and control adapter unit including monitoring.MCU is serially connected in the control of vehicle body hardware signal input and automobile safety components
Between signal input part processed.The structure of feature is the signal input part connection vehicle body hardware signal of house dog control adapter unit
The control signal input of input, signal output part connection automobile safety components.When losing feeding-dog signal, the safe work(of vehicle body
It can automatically activate, the input signal of vehicle body hardware signal input is transferred to the control signal input of automobile safety components,
Ensuring that the work of vehicle body safety component is not resetted by MCU is influenceed.
The monitoring of the house dog restarts unit for conventional MCU Reset circuit designs, and controls the electricity of adapter unit
Line structure can have a variety of implementations, and the present invention specifically discloses a kind of circuit structure to support the realization of the function, guarded the gate
The control adapter element circuit structure of dog is as shown in Figure 2.By voltage regulation unit or other external voltage transformation modules, controlled
Make the input voltage VCC of adapter unit.Selected according to the element of the power modules such as voltage regulation unit, conventional work electricity can be obtained
5.6V, 12V or other given voltages are pressed, the present embodiment is by taking input voltage VCC=5.6V as an example.The homophase input of first comparator
The 5th resistance eutral grounding by 3rd resistor connection input voltage VCC and is passed through in end respectively, adjustment 3rd resistor and the 5th resistance
Ratio makes the input voltage V5 of first comparator in-phase input end control in 3.3V；Such as by 3rd resistor value it is R3=47.5K
Ohm, the 5th resistance value are R5=120K ohms.The inverting input of first comparator is respectively by second resistance connection input
Voltage VCC, by the first capacity earth connect the first transistor collector with by the 4th resistance and penetrated again by the first triode
Electrode is grounded, and the first described transistor base is the feeding-dog signal output end that feeding-dog signal input connects MCU.Adjustment second
The ratio of resistance and the 4th resistance makes the input voltage V4 of first comparator inverting input be not more than 0.4V；It is such as electric by second
Resistance value is R2=200K ohms, the 4th resistance value is R4=47 ohm, the first electric capacity value is the micro- hair in C1=1.Second resistance,
The charge-discharge circuit of 4th resistance and the paired first comparator inverting input of the first capacitance group.
Described input voltage VCC connection the second triode radio pole, the second transistor collector connect the 3rd triode
Radio pole, the 3rd transistor collector form loop with being followed by by the 11st resistance.The ratio of second transistor base connection first
The second comparator output terminal is connected compared with device output end, the 3rd transistor base.Second comparator inverting input is respectively by the
Nine resistance connection input voltage VCC, by the tenth resistance eutral grounding, compared with the 9th resistance of adjustment makes second with the ratio of the tenth resistance
The input voltage V8 of device inverting input is controlled in 3.3V；Such as by the 9th resistance value it is that R9=33K ohms, the tenth resistance take
It is worth for R10=47K ohms.Second comparator in-phase input end is after the 7th resistance respectively by the 6th resistance connection the two or three
Pole pipe colelctor electrode, vehicle body hardware signal input is connected by the 8th resistance eutral grounding and after just connecing the first diode.Described first
The negative pole of diode be control the signal input part of adapter unit, the second transistor collector be control adapter unit adapter vehicle body
The Enable Pin of hardware signal；Described the 6th resistance, the 7th resistance, the 8th resistance and the first diode forms the second comparator pair
The negative power detection circuit of vehicle body hardware signal input.
The colelctor electrode of 3rd triode connects the control signal input of automobile safety components via driving chip；Together
Shi Suoshu driving chip is provided with overvoltage/over-current protecting unit, and described overvoltage/over-current protecting unit is preposition in automotive safety portion
The control signal input of part；Described driving chip is additionally provided with electrostatic protection unit, described electrostatic protection unit it is preposition in
The control signal input of automobile safety components.Described driving chip carries overvoltage/excessively stream and electrostatic protection function, makes automobile
Safety component control is safer.
A kind of operation principle of automobile safety components watchdog circuit of the present invention is as follows：In MCU normal operating conditions
Lower feeding-dog signal is pulse signal, and the first transistor base is in open and-shut mode repeatedly after receiving pulse signal.Due to the 3rd,
The ratio of five resistance is much smaller than the ratio of the second, the 4th resistance, therefore in the state of MCU is working properly, first comparator
The input voltage V4 of inverting input maintains 0V between 0.4V, always less than homophase input terminal voltage V5, first comparator
Output end export 5.6V always；Now the second triode is in cut-off state.Because the second triode ends, therefore the three or three
Pole pipe is similarly in cut-off state, controls the signal output part of adapter unit without output, the input of vehicle body hardware signal input
Signal is responsible for processing to the signal input part of automobile safety components by MCU.
In MCU working condition exceptions, house dog loses feeding-dog signal, the cut-off of the first triode.Now the first electric capacity is satisfied
5.6V, which can be risen to, with the anti-phase input terminal voltage V4 of rear first comparator is higher than homophase input terminal voltage V5.First comparator is defeated
Go out end and 0V is exported to the second transistor base, the second triode ON, control adapter unit is to vehicle body hardware signal input
Input signal adapter function formally starts.When vehicle body hardware signal input inputs 5V, the second comparator in-phase input end
Voltage V9=5.6V is more than anti-phase input terminal voltage V8.Second comparator output terminal makes the to the 3rd transistor base output 5.6V
Three triodes end, and the signal output part of house dog is without output.When vehicle body hardware signal input inputs 0V, the second comparator
Voltage V9=0.6V of in-phase input end is less than anti-phase input terminal voltage V8.Second comparator output terminal is to the 3rd transistor base
Output 0V opens the 3rd triode, controls the signal output part of adapter unit to the control signal input of automobile safety components
Input 5V.
In MCU working condition exceptions, the signal input part and signal output part that control adapter unit complete logical delivery,
Realize that the input signal of vehicle body hardware signal input is sent to the adapter function of automobile safety components input.Make to pacify with life
Complete closely related automobile safety components can obtain the accurate control of driver in real time, and described automobile safety components can be vapour
Car brake lamp, dipped headlight, high beam, windscreen wiper, loudspeaker, air bag etc..As long as related security function hardware input, accordingly
Security function will open, and then can greatly reduce because MCU break down caused by Traffic Accidents.Such as MCU is bad
When falling, windscreen wiper before hardware switch is opened, the rainy day visual field can be avoided to obscure and cause fender bender；Hardware switch, which is opened, to be stopped
Car light, traffic accident can be avoided to illuminate front personage during emergency brake；Hardware switch airbag opening, can be tight when colliding
Emergency opening air bag, ensure driver's passenger safety etc..
For those skilled in the art, technical scheme that can be as described above and design, make other each
The corresponding change of kind and deformation, and all these changes and deformation should all belong to the protection model of the claims in the present invention
Within enclosing.And above-mentioned all parameters only indicate that circuit structure of the present invention is to implement, and not structure is defined in itself.
Claims (4)
1. a kind of automobile safety components watchdog circuit, including MCU, house dog and automobile safety components；Described house dog bag
Include the monitoring for monitoring and restarting MCU and restart unit, described MCU is serially connected in vehicle body hardware signal input and automotive safety
Between the control signal input of part；MCU feeding-dog signal output end connection monitoring restart unit feeding-dog signal input,
The reset signal output end of unit is restarted in MCU reset signal input connection monitoring；Characterized in that, described house dog is also
Including controlling adapter unit；The signal input part connection vehicle body hardware signal input of the control adapter unit, control adapter
The control signal input of the signal output part connection automobile safety components of unit, the feeding-dog signal input for controlling adapter unit
Connect MCU feeding-dog signal output end；After described control adapter unit feeding-dog signal input loses feeding-dog signal, control connects
The input signal of vehicle body hardware signal input is transferred to the control signal input of automobile safety components by pipe unit.
2. automobile safety components watchdog circuit according to claim 1, it is characterised in that described house dog also includes
First comparator, the second comparator, the first triode, the second triode, the 3rd triode, the first diode, the first electric capacity, drive
Dynamic chip and the second to the 11st resistance；Described first comparator in-phase input end will be defeated by the three, the 5th resistance concatenated
Being inputted after entering voltage, inverting input will be inputted by the second, the 4th resistance concatenated after input voltage partial pressure, wherein the
3rd, the ratio of the 5th resistance is less than the ratio of the second, the 4th resistance；The one or three pole is concatenated between the 4th described resistance and ground
Pipe, the first transistor base connect MCU feeding-dog signal output end；Described second triode radio pole connection input voltage,
Colelctor electrode connects the 3rd triode radio pole, is grounded after the resistance of collector series connection the 11st of the 3rd triode；Described first
Comparator output terminal connection MCU reset signal input and the base stage of the second triode；Second transistor collector according to
It is grounded after the 6th resistance of secondary concatenation and the 8th resistance, the 6th resistance and the tie point of the 8th resistance are connected the after the 7th resistance
In-phase input end, the tie point of two comparators connect vehicle body hardware signal input after just connecing the first diode；Described second
The reverse input end of comparator will be inputted by the nine, the tenth resistance concatenated after input voltage partial pressure, the output of the second comparator
The base stage of the 3rd triode of end connection；3rd transistor collector connects the control signal of automobile safety components by driving chip
Input；The first described capacitance series are between the inverting input and ground of first comparator.
3. automobile safety components watchdog circuit according to claim 2, it is characterised in that described driving chip is provided with
Overvoltage/over-current protecting unit, the described preposition control signal input in automobile safety components of overvoltage/over-current protecting unit.
4. automobile safety components watchdog circuit according to claim 2, it is characterised in that described driving chip is provided with
Electrostatic protection unit, the described preposition control signal input in automobile safety components of electrostatic protection unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710909002.6A CN107479543B (en) | 2017-09-29 | 2017-09-29 | Watchdog circuit of automobile safety component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710909002.6A CN107479543B (en) | 2017-09-29 | 2017-09-29 | Watchdog circuit of automobile safety component |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107479543A true CN107479543A (en) | 2017-12-15 |
| CN107479543B CN107479543B (en) | 2023-09-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710909002.6A Active CN107479543B (en) | 2017-09-29 | 2017-09-29 | Watchdog circuit of automobile safety component |
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| Country | Link |
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| CN (1) | CN107479543B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112084057A (en) * | 2020-09-03 | 2020-12-15 | 青岛海信电子产业控股股份有限公司 | Hardware watchdog system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101165656A (en) * | 2006-10-16 | 2008-04-23 | 艾默生网络能源系统有限公司 | External watchdog circuit |
| CN102915259A (en) * | 2012-10-16 | 2013-02-06 | 延锋伟世通电子科技（上海）有限公司 | Hardware watchdog circuit of car electronic circuit |
| CN103057461A (en) * | 2012-12-26 | 2013-04-24 | 联合汽车电子有限公司 | Vehicle body controller and method for achieving limping homing thereof |
| CN207503026U (en) * | 2017-09-29 | 2018-06-15 | 马瑞利汽车电子(广州)有限公司 | A kind of automobile safety components watchdog circuit |
-
2017
- 2017-09-29 CN CN201710909002.6A patent/CN107479543B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101165656A (en) * | 2006-10-16 | 2008-04-23 | 艾默生网络能源系统有限公司 | External watchdog circuit |
| CN102915259A (en) * | 2012-10-16 | 2013-02-06 | 延锋伟世通电子科技（上海）有限公司 | Hardware watchdog circuit of car electronic circuit |
| CN103057461A (en) * | 2012-12-26 | 2013-04-24 | 联合汽车电子有限公司 | Vehicle body controller and method for achieving limping homing thereof |
| CN207503026U (en) * | 2017-09-29 | 2018-06-15 | 马瑞利汽车电子(广州)有限公司 | A kind of automobile safety components watchdog circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112084057A (en) * | 2020-09-03 | 2020-12-15 | 青岛海信电子产业控股股份有限公司 | Hardware watchdog system |
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| Publication number | Publication date |
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| CN107479543B (en) | 2023-09-19 |
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