CN110031692A - A kind of auxiliary mobile unit accurately identifies the method and circuit of ACC state - Google Patents
A kind of auxiliary mobile unit accurately identifies the method and circuit of ACC state Download PDFInfo
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- CN110031692A CN110031692A CN201810022888.7A CN201810022888A CN110031692A CN 110031692 A CN110031692 A CN 110031692A CN 201810022888 A CN201810022888 A CN 201810022888A CN 110031692 A CN110031692 A CN 110031692A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- 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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
The present invention relates to methods and circuit that a kind of auxiliary mobile unit accurately identifies ACC state, utilize the stabilizing voltage characteristic of voltage-stabiliser tube, the partial pressure properties of resistance, using AD acquisition mode, to realize the detection of ACC state, and ACC is handled under different conditions, realize that equipment normally starts and closes, circuit is simple, low in cost, state-detection precision is high；Eliminating environmental factors leads to the more difficult deficiency being accurately arranged of ACC threshold value, improves the accuracy of setting ACC threshold value, and controllability is strong, and stability is high, and circuit has versatility.The present invention realizes data interaction, real-time control unit switch state and real-time status alarm with serial communication, SPI communication, improves system stability and device intelligence.And whether extremely installation can quickly find ACC state, and carry out audio alert, while equipment is shut down as usual, guarantee that equipment under the abnormality of ACC OFF, can be prevented with normal shutdown to the unnecessary power consumption of battery on vehicle.
Description
Technical field
The present invention relates to vehicle-mounted control technologies, accurately identify ACC state more specifically to a kind of auxiliary mobile unit
Method and a kind of auxiliary mobile unit accurately identify the circuit of ACC state.
Background technique
With the development of auto age, vehicle electronics product onboard with more and more extensive, in this way but also on vehicle
Electronics wiring become increasingly complex.Car body itself be one it is complicated floatingly, if interior electronic equipment ground connection is not sufficiently good,
Or equipment room string it is electric the problems such as, will lead on vehicle under ACC OFF state, ACC has a certain size voltage over the ground.
And in the utilization of vehicle-mounted multimedia entertainment system product, typically by the ignition switch ACC on vehicle, to touch
Hair starting and close.Judgement for ACC state, and detect setting and the place of effective threshold value of the high and low level of ACC
Reason, it appears most important.
If ACC is over the ground there is also when abnormal voltage, and equipment is to the low level thresholding for detecting ACC under ACC OFF state
Value setting is too low, it will causes equipment that can not shut down；If as cell voltage is relatively low, but belonged to normal under ACC ON state
In fluctuation range, the too high of the high level threshold value setting of ACC is detected, it will equipment is caused to cannot be started up.
The detection circuit of the ACC state of the prior art, one is the detection circuit for using optocoupler to form, another kind is to use
The detection circuit of multiple triode combinations.The working principle of both detection circuits is all the I/O that will test result and be converted to CPU
The high and low state change of mouth, and then judge ACC state for ACC ON or ACC OFF.
But since theoretical value and practice values often differ bigger, the judgment mode of two kinds of above-mentioned detection circuits, for
The setting of ACC threshold value can all have certain uncertainty.
It, will be by optocoupler current transfer ratio (the same optocoupler under various circumstances, current transfer ratio in optocoupler combinational circuit
Different) and CPU I/O mouth itself high and low level threshold value range (different CPU, I/O mouthfuls high and low
Threshold value can be variant) influence.If in equipment utilization, when the detection for thering are multiple CPU to need to carry out ACC state, then shadow
Sound becomes apparent from, and the threshold value of ACC will more bad control.
It for another example in triode combinational circuit, needs to control electric current and makes triode in switch state, while also by I/O mouthfuls of sheets
The influence of height, low level threshold value range.
Summary of the invention
It is versatile it is an object of the invention to overcome the deficiencies of the prior art and provide a kind of circuit cost is low, state inspection
Intelligence is surveyed, quickly ACC state is judged, ACC is handled under different conditions, realizes that equipment normally starts and closes auxiliary
Mobile unit is helped to accurately identify the method and circuit of ACC state.
Technical scheme is as follows:
A method of auxiliary mobile unit accurately identifies ACC state, and step includes:
1) pressure stabilizing is carried out to power supply on vehicle ACC input voltage, and detection node is set, when ACC is on state, detection is saved
Point pressure stabilizing is the value range fluctuated between preset error amount in normal boot-strap voltage VT, VT；When ACC is in OFF state, inspection
Surveying node, there are 0~VF of normal shutdown voltage range；
2) booting and shutdown of the voltage V1 control mobile unit based on detection node: when ACC is on state, V1=
VT, mobile unit booting, otherwise determines electric voltage exception, remains turned off；When ACC is in OFF state, V1 meets 0~VF, determines electricity
Positive pressure is normal, mobile unit shutdown, otherwise determines electric voltage exception, mobile unit shutdown.
Preferably, the booting of mobile unit passes through its high level threshold value and low level threshold value to ACC with shutdown
It determines；When ACC is on state, ACC input voltage range VM~VN, when ACC is in OFF state, the voltage-to-ground of ACC is 0
To maximum permissible voltage VP；
When ACC is on state, and mobile unit is greater than VN, mobile unit to the minimum value of the high level threshold value of ACC
Still carry out booting；When ACC is in OFF state, and mobile unit is less than VP, vehicle to the maximum value of the low level threshold value of ACC
It carries equipment and still carries out shutdown.
Preferably, setting voltage regulator circuit, when ACC is on state, voltage regulator circuit is in pressure stabilizing state, on voltage regulator circuit
Detection node voltage V1 pressure stabilizing in normal boot-strap voltage VT；When ACC is in OFF state, voltage regulator circuit not in pressure stabilizing state,
The voltage V1 of detection node is less than the maximum allowable abnormal voltage VF of 0~VF of normal shutdown voltage range.
Preferably, control power module is vehicle-mounted sets when the booting of the voltage V1 of detection node control mobile unit
Available electricity, and power-on command is sent to mobile unit；When the shutdown of the voltage V1 of detection node control mobile unit, control electricity
Source module stops being that mobile unit is powered, and sends shutdown command to mobile unit.
Preferably, setting aiding CPU, the voltage V1 of acquisition testing node, when ACC is on state, V1=VT is assisted
CPU controls power module and opens enabled pin, and power module is mobile unit power supply, otherwise keeps the enabled pin of power module
It does not open；When ACC is in OFF state, for V1 regardless of whether meeting 0~VF, aiding CPU controls the enabled pin of power module not
It opens, power module stops being that mobile unit is powered.
Preferably, VT and VF are stored in aiding CPU, after acquiring V1, operation is compared in aiding CPU.
Preferably, carrying out warning reminding when determining electric voltage exception.
A kind of auxiliary mobile unit accurately identifies the circuit of ACC state, including voltage regulator circuit, aiding CPU, ACC input electricity
Pressure loads on voltage regulator circuit, the detection node being arranged on the input pin connection voltage regulator circuit of aiding CPU；The GPIO of aiding CPU
The enabled pin of the power module of pin and automobile connects, and aiding CPU carries out data interaction by serial ports with mobile unit.
Preferably, being connected with filter circuit on ACC input route, the noise that ACC igniting generates is eliminated.
Preferably, including potential-divider network, the current-limiting resistance of potential-divider network provides by partial pressure and loads on voltage regulator circuit
The voltage of voltage, detection node.
Preferably, potential-divider network includes limit voltage R1, R2, R3, R4, voltage regulator circuit uses voltage-stabiliser tube ZD, filtered electrical
Road includes that filter capacitor C1, C2, limit voltage R1, ACC input terminal ACC IN connect with limit voltage R1, R2, ground connection GND, surely
Pressure pipe ZD is in parallel with limit voltage R2, and the series circuit of limit voltage R3, R4 are in parallel with voltage-stabiliser tube ZD, and the input of aiding CPU is drawn
Foot is connected to the tie point of limit voltage R3, R4, and filter capacitor C1, C2 are in parallel with limit voltage R2.
Preferably, limit voltage R2 is parallel with electrostatic protection pipe.
Preferably, the SPI pin of aiding CPU is connect with alarm module.
Beneficial effects of the present invention are as follows:
Auxiliary mobile unit of the present invention accurately identifies the method and circuit of ACC state, utilizes the pressure stabilizing of voltage-stabiliser tube
The partial pressure properties of characteristic, resistance, using AD acquisition mode, the detection of Lai Shixian ACC state, and to ACC under different conditions into
Row processing realizes that equipment normally starts and closes, and circuit is simple, and low in cost, state-detection precision is high；Environmental factors are eliminated to lead
The more difficult deficiency being accurately arranged of ACC threshold value is caused, the accuracy of setting ACC threshold value is improved, controllability is strong, and stability is high,
Circuit has versatility.
The present invention realizes data interaction, real-time control unit switch state and real-time shape with serial communication, SPI communication
State alarm, improves system stability and device intelligence.And installation can quickly find whether ACC state is different
Often, and audio alert is carried out, informs installation personnel with the presence or absence of imperfect earth or electric problem of going here and there, to carry out the row of wiring on vehicle
It looks into, handles abnormal problem in time, while equipment is shut down as usual, guarantee that equipment under the abnormality of ACC OFF, can be closed normally
Machine is prevented to the unnecessary power consumption of battery on vehicle.
Detailed description of the invention
Fig. 1 is the functional block diagram for the circuit that auxiliary mobile unit accurately identifies ACC state；
Fig. 2 is the flow diagram for the method that auxiliary mobile unit accurately identifies ACC state；
In figure, it is circuit of the invention in dotted line frame, is peripheral circuit outside dotted line frame；V0 indicates the current state of ACC, generation
All voltage status when table ACC is on state or OFF state.
Specific embodiment
The present invention is further described in detail with reference to the accompanying drawings and embodiments.
The present invention in order to solve influence of the ACC imperfect earth of the existing technology to mobile unit normal switch machine, with
And mobile unit sets the deficiencies of ACC threshold value more in high accuracy, provides a kind of auxiliary mobile unit and accurately identifies ACC state
The characteristic of method and circuit, pressure stabilizing and partial pressure realizes the detection of ACC state by the voltage of detection node, and different
Voltage judgement is carried out under ACC state, is realized in the range of larger voltage fluctuation, mobile unit normal switch machine, is eliminated outer
Boundary's factor leads to the mobile unit deficiency being accurately arranged more difficult to ACC threshold value, improves the accuracy of setting ACC threshold value,
Circuit has versatility.
The auxiliary mobile unit method that accurately identifies ACC state of the present invention, step mainly include standard of establishing with
Judgement two steps of processing:
1) it establishes standard: pressure stabilizing being carried out to power supply on vehicle ACC input voltage, and detection node is set, when ACC is in ON shape
State, detection node pressure stabilizing are the value range fluctuated between preset error amount in normal boot-strap voltage VT, VT；When ACC is in
OFF state, there are 0~VF of normal shutdown voltage range for detection node.
2) judgement is handled: the booting and shutdown of the voltage V1 control mobile unit based on detection node: when ACC is in ON shape
Otherwise state, V1=VT, mobile unit booting determine electric voltage exception, remain turned off；When ACC is in OFF state, V1 meets 0~
VF determines that voltage is normal, mobile unit shutdown, otherwise determines electric voltage exception, mobile unit shutdown.
As stated in the background art, it is generally the case that even if the operating condition of power supply on vehicle is normal, regardless of ACC it is on state or
All there is certain fluctuating range in OFF state, ACC input voltage, and not representing fault.Booting and pass due to mobile unit
Machine determines the high level threshold value and low level threshold value of ACC by it；If only simply expanding threshold value, so that thresholding
Value can cover the voltage fluctuation of appearance, it is likely that mobile unit occur to the high level threshold value and low level thresholding of ACC
Value overlaps, and can cover the voltage fluctuation range that ACC is on state or OFF state occurs respectively.Then mobile unit
Error handle will be made to the overlapping range, can not such as shut down.
Assuming that in the normal situation of operating condition, when ACC is on state, ACC input voltage range VM~VN, at ACC
In OFF state, the voltage-to-ground of ACC is 0 to maximum permissible voltage VP；The present invention combines the control of mobile unit switching on and shutting down
The voltage of detection node determines and ACC state in which, i.e., when ACC is on state, even if mobile unit is to the high level of ACC
The minimum value of threshold value is greater than VN, as long as V1=VT, mobile unit still carries out booting；When ACC is in OFF state, even if vehicle
It carries equipment and VP is less than to the maximum value of the low level threshold value of ACC, as long as V1 meets 0~VF, mobile unit still carries out shutdown.
The present embodiment carries out pressure stabilizing to power supply on vehicle ACC input voltage by setting voltage regulator circuit, when ACC is in ON shape
State, voltage regulator circuit are in pressure stabilizing state, and the voltage V1 pressure stabilizing of the detection node on voltage regulator circuit is in normal boot-strap voltage VT；When
ACC is in OFF state, and for voltage regulator circuit not in pressure stabilizing state, the voltage V1 of detection node is less than 0~VF of normal shutdown voltage range
Maximum allowable abnormal voltage VF.
The voltage of present invention combination detection node determines and ACC state in which controls mobile unit switching on and shutting down, works as detection
When the booting of the voltage V1 control mobile unit of node, power module is controlled as mobile unit power supply, and send power-on command extremely
Mobile unit；When the shutdown of the voltage V1 of detection node control mobile unit, control power module stops being that mobile unit supplies
Electricity, and shutdown command is sent to mobile unit.
In the present embodiment, aiding CPU is set, the voltage V1 of acquisition testing node in a manner of A/D, when ACC is on state,
V1=VT, aiding CPU control power module and open enabled pin, and power module is mobile unit power supply, otherwise keep power supply mould
The enabled pin of block is not opened；When ACC is in OFF state, for V1 regardless of whether meeting 0~VF, aiding CPU controls power module
Enabled pin do not open, power module stop be mobile unit power.
Based on the method that the auxiliary mobile unit accurately identifies ACC state, the present invention also provides a kind of auxiliary is vehicle-mounted
Equipment accurately identifies the circuit of ACC state, as shown in Figure 1, including voltage regulator circuit, aiding CPU, ACC input voltage is loaded on surely
Volt circuit, the input pin of aiding CPU connect the detection node being arranged on voltage regulator circuit；The GPIO pin and automobile of aiding CPU
Power module the connection of enabled pin, aiding CPU and mobile unit carry out data interaction by serial ports.
In order to carry out voltage judgement more quickly, VT and VF are stored in aiding CPU by the present invention, after acquiring V1, auxiliary
It helps and is compared operation in CPU.
And when electric voltage exception, it needs to repair or malfunction elimination is reminded, to guarantee that vehicle condition is normal, then determine that voltage is different
Chang Shi carries out warning reminding.
In order to which more accurately the voltage range in normal range (NR) is identified and handled, it is connected on ACC input route
Filter circuit eliminates the noise that ACC igniting generates, prevents the result of noise jamming VT and VF.
The present invention is also added into electric resistance partial pressure characteristic, also wraps then in the present embodiment with the stabilizing voltage characteristic structure of voltage regulator circuit
Potential-divider network is included, the current-limiting resistance of potential-divider network provides the electricity of the voltage, detection node that load on voltage regulator circuit by partial pressure
Pressure.
In order to eliminate electrostatic, protect late-class circuit, limit voltage R2 is parallel with electrostatic protection pipe D1, be located at voltage-stabiliser tube ZD with
Between current-limiting resistance R2.The SPI pin of aiding CPU is connect with alarm module, to realize the awake function of alarm report.
Specifically, potential-divider network includes limit voltage R1, R2, R3, R4 (using precision resistance), limit voltage R1, R2's
Tie point voltage is V2, and the tie point of limit voltage R3, R4 are detection node, voltage V1；Voltage regulator circuit uses voltage-stabiliser tube ZD,
Burning voltage is VZ；Filter circuit includes filter capacitor C1, C2, limit voltage R1；ACC input terminal ACC IN and limit voltage
R1, R2, ground connection GND series connection, voltage-stabiliser tube ZD is in parallel with limit voltage R2, the series circuit and voltage-stabiliser tube ZD of limit voltage R3, R4
Parallel connection, the input pin of aiding CPU are connected to the tie point (i.e. detection node) of limit voltage R3, R4, filter capacitor C1, C2 with
Limit voltage R2 is in parallel.
When ACC is on state, aiding CPU is powered by battery on vehicle, when ACC is in OFF state, is supplied by internal cell
Electricity.The serial ports (RXD, TXD) of serial ports (TXD, RXD) connecting vehicular equipment of aiding CPU realizes data interaction；Aiding CPU
GPIO0 controls the enabled of power module；The SPI interface of aiding CPU is connected with the SPI interface of alarm module, realizes data interaction.
The A/D of aiding CPU acquires input port connecting detection node, this voltage value is V2.
Wherein, power module (interior to include the circuits such as DCDC), powers, the IN foot of power module, which picks up, to be powered on to mobile unit
The BATT of pond output, GND foot pick up the ground of battery, and VOUT foot is the power input foot VIN of power supply output pin and mobile unit
It is connected, EN foot is that the enabled foot of power module is connected with the GPIO0 of aiding CPU, is controlled by aiding CPU.
It is contained in mobile unit and realizes that all sub-function modules of multimedia recreation function and aiding CPU pass through serial ports
(TXD, RXD) is communicated, and realizes data interaction.
In the present embodiment, alarm module is the circuit containing speech recording and reproducing IC and voice play function, logical with aiding CPU
SPI communication agreement is crossed, realizes that the voice of alarm module plays.
The end ACC IN of current-limiting resistance R1 is connected to the ACC on vehicle, and voltage is because of the aging of battery or in automobile starting on vehicle
Afterwards, have and centainly fluctuate, set herein ACC it is on state when, on vehicle power supply normal voltage range VM~VN (12V's
Vehicle and 24 vehicle voltage range are different), then when ACC is on state, normal valley voltage is VM.ACC is in
When OFF state, ACC voltage-to-ground range is 0~VP；When then ACC is in OFF state, ACC admissible maximum allowable electricity over the ground
Pressure value is VP.
The circuit operation principle that auxiliary mobile unit of the present invention accurately identifies ACC state is as follows:
According to the partial pressure properties of the stabilizing voltage characteristic of voltage-stabiliser tube ZD and resistance, the voltage that ACC is inputted when ACC is on state
For minimum virtual value VM input, by the partial pressure of current-limiting resistance, voltage-stabiliser tube ZD is just made to be in pressure stabilizing state, so that auxiliary
The A/D acquisition input port of CPU detects voltage value V1=[VZ/ (R3+R4)] * R4；It the key assignments, is indicated with VT, setting is certain
It is pre-stored in after error range in the memory of aiding CPU.
When ACC is on state, if the voltage of ACC input is maximum virtual value VN, because voltage-stabiliser tube ZD pressure stabilizing is made
With the voltage value of the A/D acquisition input port detection of aiding CPU can be stablized in V1=[VZ/ (R3+R4)] * R4；Aiding CPU acquisition
To voltage will not change with the fluctuation of ACC voltage.When i.e. ACC is on state, if the A/D of aiding CPU acquires input
The collected key assignments of mouth indicates that ACC is normal, mobile unit normally starts within the scope of the key assignments VT of setting；If A/D is adopted
Collect the collected key assignments in input port, not within the scope of the key assignments VT of setting, expression ACC is low-pressure state, and equipment does not start.
When ACC is in OFF state, it is VP that ACC remains in admissible maximum permissible voltage over the ground, at this point, voltage-stabiliser tube
ZD is not in pressure stabilizing state, the collected voltage value V1=(VP*R2*R4) of aiding CPU/[(R1+R2) * (R3+R4)], this key assignments
It is indicated with VF, is set to maximum allowable abnormal voltage VF, when ACC is in OFF state, A/D acquisition testing is maximum fair to being greater than
Perhaps abnormal voltage VF, the abnormal voltage that expression ACC is in OFF state already exceed range, are judged as failure, need to detect on vehicle
Installation scenarios.
ACC state-detection post-processing step, as shown in Fig. 2, specific as follows:
Step 1: the A/D of aiding CPU acquires the collected voltage V1 in input port when ACC is on state, judge whether
Within the scope of VT.If it is, aiding CPU control GPIO0 exports high level, the enabled foot of power module is opened, is made
It obtains power module to power to mobile unit, and power-on command is issued by the serial ports of aiding CPU, so that the normal work of mobile unit
Make, while aiding CPU will be communicated by SPI interface and alarm module, plays voice prompting and normally strike sparks；If it is not, then table
Show that ACC voltage value is too low, aiding CPU controls GPIO0 and exports low level, and the enabled foot of power module do not open, mobile unit without
Method powers on, and is not switched on, while aiding CPU will be communicated by SPI interface and alarm module, play voice prompting low voltage, be needed
Check cell voltage.
Step 2: when ACC is in OFF state, aiding CPU collection voltages V1=(V0*R2*R4)/[(R1+R2) * (R3+
R4)].As V1 > VF, when indicating that ACC is in OFF state, the abnormal voltage of ACC is more than specified value VF, then aiding CPU passes through
SPI interface and alarm module communication inform installation personnel, need to detect on vehicle so that alarm module plays abnormal alarm information
Route, while aiding CPU issues shutdown command to mobile unit by serial ports, after mobile unit saves data, into shutdown shape
State.Then, aiding CPU control GPIO0 exports low level, cuts off the power supply of mobile unit, guarantees that ACC is in OFF state
Under, equipment is all in off-mode.
As V2 < VF, indicating that ACC is under OFF state, the voltage of ACC is 0 or is within receivable range of voltages,
For normal condition, then aiding CPU is communicated by SPI interface and alarm module, so that alarm module plays normal voice messaging,
Inform installation personnel normal shutdown, while aiding CPU issues shutdown command to mobile unit by serial ports, mobile unit saves number
According to complete, into off-mode.Then, aiding CPU control GPIO0 exports low level, cuts off the power supply of mobile unit, guarantees
Equipment normal shutdown.
Above-described embodiment is intended merely to illustrate the present invention, and is not used as limitation of the invention.As long as according to this hair
Bright technical spirit is changed above-described embodiment, modification etc. will all be fallen in the scope of the claims of the invention.
Claims (13)
1. a kind of auxiliary mobile unit method for accurately identifying ACC state, which is characterized in that step includes:
1) pressure stabilizing is carried out to power supply on vehicle ACC input voltage, and detection node is set, when ACC is on state, detection node is steady
It is pressed on normal boot-strap voltage VT, VT is the value range fluctuated between preset error amount；When ACC is in OFF state, detection section
There are 0~VF of normal shutdown voltage range for point；
2) booting and shutdown of the voltage V1 control mobile unit based on detection node: when ACC is on state, V1=VT, vehicle
Device power-up is carried, electric voltage exception is otherwise determined, remains turned off；When ACC is in OFF state, V1 meets 0~VF, is determining voltage just
Often, mobile unit shuts down, and otherwise determines electric voltage exception, mobile unit shutdown.
2. the method that auxiliary mobile unit according to claim 1 accurately identifies ACC state, which is characterized in that vehicle-mounted to set
Standby booting determines the high level threshold value and low level threshold value of ACC by it with shutdown；When ACC is on state, ACC
Input voltage range VM~VN, when ACC is in OFF state, the voltage-to-ground of ACC is 0 to maximum permissible voltage VP；
When ACC is on state, and mobile unit is greater than VN to the minimum value of the high level threshold value of ACC, and mobile unit is still
It boots up；When ACC is in OFF state, and mobile unit is less than VP to the maximum value of the low level threshold value of ACC, vehicle-mounted to set
It is standby to still carry out shutdown.
3. the method that auxiliary mobile unit according to claim 1 or 2 accurately identifies ACC state, which is characterized in that setting
Voltage regulator circuit, when ACC is on state, voltage regulator circuit is in pressure stabilizing state, and the voltage V1 of the detection node on voltage regulator circuit is steady
It is pressed on normal boot-strap voltage VT；When ACC is in OFF state, not in pressure stabilizing state, the voltage V1 of detection node is less than voltage regulator circuit
The maximum allowable abnormal voltage VF of 0~VF of normal shutdown voltage range.
4. the method that auxiliary mobile unit according to claim 3 accurately identifies ACC state, which is characterized in that work as detection
When the booting of the voltage V1 control mobile unit of node, power module is controlled as mobile unit power supply, and send power-on command extremely
Mobile unit；When the shutdown of the voltage V1 of detection node control mobile unit, control power module stops being that mobile unit supplies
Electricity, and shutdown command is sent to mobile unit.
5. the method that auxiliary mobile unit according to claim 4 accurately identifies ACC state, which is characterized in that setting is auxiliary
CPU, the voltage V1 of acquisition testing node are helped, when ACC is on state, V1=VT, it is enabled that aiding CPU controls power module opening
Pin, power module are mobile unit power supply, otherwise the enabled pin of power module are kept not open；When ACC is in OFF shape
State, V1 regardless of whether meeting 0~VF, do not open by the enabled pin that aiding CPU controls power module, and power module stops being vehicle
Carry equipment power supply.
6. the auxiliary mobile unit method that accurately identifies ACC state according to claim 5, which is characterized in that by VT with
VF is stored in aiding CPU, and after acquiring V1, operation is compared in aiding CPU.
7. the method that auxiliary mobile unit accurately identifies ACC state according to claim 1 or 5, which is characterized in that determine
When electric voltage exception, warning reminding is carried out.
8. a kind of auxiliary mobile unit accurately identifies the circuit of ACC state, which is characterized in that including voltage regulator circuit, aiding CPU,
ACC input voltage loads on voltage regulator circuit, the detection node being arranged on the input pin connection voltage regulator circuit of aiding CPU；Auxiliary
The enabled pin of the power module of the GPIO pin and automobile of CPU connects, and aiding CPU carries out data by serial ports with mobile unit
Interaction.
9. the circuit that auxiliary mobile unit according to claim 8 accurately identifies ACC state, which is characterized in that ACC input
It is connected with filter circuit on route, eliminates the noise that ACC igniting generates.
10. the circuit that auxiliary mobile unit according to claim 8 or claim 9 accurately identifies ACC state, which is characterized in that packet
Potential-divider network is included, the current-limiting resistance of potential-divider network provides the electricity of the voltage, detection node that load on voltage regulator circuit by partial pressure
Pressure.
11. the circuit that auxiliary mobile unit according to claim 10 accurately identifies ACC state, which is characterized in that partial pressure
Network includes limit voltage R1, R2, R3, R4, and voltage regulator circuit uses voltage-stabiliser tube ZD, and filter circuit includes filter capacitor C1, C2, limit
Galvanic electricity pressure R1, ACC input terminal ACC IN and limit voltage R1, R2, ground connection GND connect, and voltage-stabiliser tube ZD is in parallel with limit voltage R2,
The series circuit of limit voltage R3, R4 are in parallel with voltage-stabiliser tube ZD, and the input pin of aiding CPU is connected to limit voltage R3, R4
Tie point, filter capacitor C1, C2 are in parallel with limit voltage R2.
12. the circuit that auxiliary mobile unit according to claim 11 accurately identifies ACC state, which is characterized in that current limliting
Voltage R2 is parallel with electrostatic protection pipe.
13. the circuit that auxiliary mobile unit according to claim 8 accurately identifies ACC state, which is characterized in that auxiliary
The SPI pin of CPU is connect with alarm module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810022888.7A CN110031692B (en) | 2018-01-10 | 2018-01-10 | Method and circuit for assisting vehicle-mounted equipment in accurately identifying ACC (active control) state |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810022888.7A CN110031692B (en) | 2018-01-10 | 2018-01-10 | Method and circuit for assisting vehicle-mounted equipment in accurately identifying ACC (active control) state |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110031692A true CN110031692A (en) | 2019-07-19 |
| CN110031692B CN110031692B (en) | 2023-07-21 |
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| CN201810022888.7A Active CN110031692B (en) | 2018-01-10 | 2018-01-10 | Method and circuit for assisting vehicle-mounted equipment in accurately identifying ACC (active control) state |
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| CN110031692B (en) | 2023-07-21 |
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