CN202424602U - Controller for automobile electric fuel pump - Google Patents
Controller for automobile electric fuel pump Download PDFInfo
- Publication number
- CN202424602U CN202424602U CN2011203927459U CN201120392745U CN202424602U CN 202424602 U CN202424602 U CN 202424602U CN 2011203927459 U CN2011203927459 U CN 2011203927459U CN 201120392745 U CN201120392745 U CN 201120392745U CN 202424602 U CN202424602 U CN 202424602U
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- protection
- controller
- acquisition module
- voltage
- electromotive force
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Abstract
The utility model relates to a controller for an automobile electric fuel pump, comprising a signal acquisition module, an MCU and an output drive circuit. The signal acquisition module comprises a voltage acquisition module and a current and back electromotive force negative zero-crossing point acquisition module; the MCU employs C8051F330, voltage protection, current protection, temperature acquisition and protection and back electromotive force negative zero-crossing point determination are carried out in the interior, and a watchdog is included; the output drive circuit comprises A-, B- and C-phase upper and lower bridge drive circuit, the upper bridge employs P channel field effect transistor AO4407, and the lower bridge employs N channel field effect transistor AO4406. The negative zero-crossing points of three-phase (A-, B- and C-phase) back electromotive force are measured, thereby the commutation time of the three phases is calculated, the commutation of the electric fuel pump is controlled, and simultaneously, voltage protection, current protection, power supply polarity reversal connection protection and temperature protection functions can be realized, and the system is guaranteed to work normally.
Description
Technical field
The utility model belongs to automobile manufacturing field, particularly a kind of controller that is used for the motorcar electric fuel pump.
Background technology
Electric fuel punp is the important part of vehicle fuel feed system, and its effect is pumping in the fuel from fuel tank, and through each cylinder of fuel injector supply engine.The quality of electric fuel punp quality directly has influence on the performance of car load.
The brush DC electric fuel punp adopts position-sensor-free, and rotor is a magnet structure, and this structure has following advantage: at first DC Brushless Motor uses electronic commutating device to replace having the mechanical commutation device of brush DC motor; On the basis of the good speed adjusting performance that has kept the conventional dc motor fully, the brushless wearing and tearing, reliability is high; Service life prolongs greatly, does not have mechanical commutation spark and consequent electromagnetic noise and interference, reduces maintenance needs greatly; And do not need electric excitation; Efficient is higher relatively, so this type motor has the brush direct current machine to have incomparable advantage when the motorcar electric fuel pump.But electric fuel punp needs controller to come control action, if controller often goes wrong, the electric fuel punp quality is good more also to be futile, so the reliable controller of steady quality is the assurance of electric fuel punp reliably working.
The utility model content
The technical problem that the utility model will solve provides a kind ofly has good commutation control, and the motorcar electric FPC Fuel Pump Controller that when it moves, can carry out the real-time guard of temperature, electric current and voltage.
A kind of controller that is used for the motorcar electric fuel pump, it comprises signal acquisition module, MCU and output driving circuit, signal acquisition module comprises that voltage acquisition module, electric current and back electromotive force bear the zero crossing acquisition module; MCU uses C8051F330, and inner execution voltage protection, current protection, temperature acquisition and protection, the negative zero crossing of back electromotive force are judged, and contained house dog; Output driving circuit comprises A, B, C phase bridge drive circuit up and down, and last bridge uses P channel field effect transistors AO4407, and following bridge uses N channel field effect transistors AO4406.
The advantage of the utility model controller is:
1. through measuring A, B, the negative zero crossing of C three-phase back electromotive force, can control the commutation opportunity of three-phase exactly, control accurately;
2. can realize the protection of high pressure and low voltage voltage, and voltage measurement avoids the due to voltage spikes that causes because of afterflow opportunity, can realize the consistency of protecting;
3. use the built-in temperature sensor of C8051F330, saved the external circuit space, strengthened integration, reduced simultaneously because the analog-to-digital conversion error that hardware circuit brought has realized accurate control;
4. little resistance voltage of sampling input single-chip microcomputer after filtering is amplified can record size of current; Value of magnification input comparator with the sampling resistor terminal voltage; Compare with the set point of comparator,, can realize current protection through single-chip microcomputer detection comparator variation of output signals.This method makes the current protection value more accurate;
5. interrupt routine is controlled in the 40us through optimizing.Be 40us interrupt cycle, makes count value increase, and the measurement of the negative zero crossing of commutation control and back electromotive force is more accurate;
6. made up the protection to error-polarity connection of power supply circuit through P channel field effect transistors AO4407, this circuit is under the prerequisite that realizes protection to error-polarity connection of power supply, and more traditional series diode realizes that the method pressure drop of protection to error-polarity connection of power supply is little, and efficient is high.
Description of drawings
Fig. 1 is used for the structured flowchart of the controller of motorcar electric fuel pump for the utility model;
Embodiment
The concrete control mode that the utility model is used for the controller of motorcar electric fuel pump below in conjunction with accompanying drawing is done explanation in further detail.
Fig. 1 has provided the structured flowchart of the controller of the utility model automotive brushless electric fuel punp.The utility model automobile is used for the controller of motorcar electric fuel pump, and it comprises signal acquisition module, MCU and drive circuit, and signal acquisition module comprises voltage acquisition module, electric current and back electromotive force acquisition module; MCU uses the products C 8051F330 of core section laboratory (Silicon Labs), and inner execution voltage protection, current protection, temperature acquisition and protection, the negative zero crossing of back electromotive force are judged, and contained house dog; Described drive circuit comprises A, B, C phase bridge drive circuit up and down, and last bridge uses P channel field effect transistors AO4407, and following bridge uses N channel field effect transistors AO4406.
Detecting with the negative zero crossing of A phase back electromotive force is example; Specific embodiments is: between power supply and ground, insert two precision resistances and obtain the power supply dividing potential drop, the A that descend precision resistance of parallelly connected two similar resistance between drain electrode and the ground of bridge field-effect transistor AO4406 to obtain in proportion at A mutually descends the bridge dividing potential drop mutually.Every entering is once interrupted; All descend after bridge dividing potential drop and the power supply dividing potential drop half to make comparisons mutually A; If A descends bridge dividing potential drop gained voltage half the less than after the power supply dividing potential drop just mutually; Think that then this is exactly the negative zero crossing of A phase back electromotive force constantly, calculate 30 °, 60 °, the 90 ° pairing count values of electrical degree this moment, and with the count value zero clearing.After 30 ° of electrical degrees, be exactly this phase commutation point; Through 60 ° of electrical degrees, this moment is owing to have no in commutation, so system voltage do not receive the influence of afterflow spike, thereby carries out system voltage collection and voltage protection judgement; Through 60 ° and 90 ° of electrical degrees, carry out corresponding commutation respectively.
The protection of this controller can be divided into four types, is respectively: 1. current protection, 2. voltage protection, 3. temperature protection, 4. protection to error-polarity connection of power supply.Below be protection content and specific embodiments.
1. current protection: the current protection higher limit is made as 8A, mainly is when motor rotation blockage or short circuit, can judge and make action rapidly, turn-offs control signal output, protection smd controller and motor.Specific embodiments is: little resistance voltage of sampling input single-chip microcomputer after filtering is amplified can record size of current; With the value of magnification input comparator of sampling resistor terminal voltage, the set point comparison with comparator through single-chip microcomputer detection comparator variation of output signals, can realize current protection.
2. voltage protection: through the precision resistance dividing potential drop between power supply and the ground, ratio is calculated can get system voltage, if exceed allowed band, then cut-off signals output prevents that components and parts from suffering damage;
3. temperature protection: use the built-in temperature sensor of C8051F330, carry out inner analog-to-digital conversion, cut-off signals output prevents that components and parts from suffering damage when excess temperature.
4. protection to error-polarity connection of power supply: make up the protection to error-polarity connection of power supply circuit through P channel field effect transistors AO4407; This circuit is effectively being realized under the prerequisite of protection to error-polarity connection of power supply function; More traditional series diode realizes that the method pressure drop of protection to error-polarity connection of power supply is little, and efficient is high.
In order to save the time of interruption, when different electrical degrees, carry out the different protection content.Because during certain line to line fault of stall or motor, another does not have electric current to flow through mutually but controller and motor have the possibility of burning equally, so electric current must be done real-time guard.Therefore remove outside the commutation point, get into each time and interrupt all will carrying out current detecting and protection.The susceptibility of voltage protection and temperature protection is high not as electric current, and motor whenever circles, and once protects, and can shorten the time of implementation of interruption so widely, and count value is increased, and commutation is more accurate.
Claims (6)
1. controller that is used for the motorcar electric fuel pump, it is characterized in that: said controller comprises signal acquisition module, MCU and output driving circuit, signal acquisition module comprises that voltage acquisition module, electric current and back electromotive force bear the zero crossing acquisition module; MCU uses C8051F330, and inner execution voltage protection, current protection, temperature acquisition and protection, the negative zero crossing of back electromotive force are judged, and contained house dog; Output driving circuit comprises A, B, C phase bridge drive circuit up and down, and last bridge uses P channel field effect transistors AO4407, and following bridge uses N channel field effect transistors AO4406.
2. according to the said controller of claim 1, it is characterized in that: can on the commutation opportunity of calculating three-phase, carry out the commutation control of motor through measuring A, B, the negative zero crossing of C three-phase back electromotive force.
3. controller according to claim 1 is characterized in that: adopt the bulk temperature of the built-in temperature sensor acquisition controller of microprocessor, realize temperature protection.
4. controller according to claim 1 is characterized in that: but the supply power voltage of said voltage acquisition module acquisition system is realized voltage protection.
5. controller according to claim 1 is characterized in that: the said sampling resistor voltage that is connected in the main circuit is amplified back input single-chip microcomputer to detect size of current through filtering; According to comparator, promptly value of magnification and set point relatively realize current protection with the output signal again.
6. controller according to claim 1 is characterized in that: make up the protection to error-polarity connection of power supply circuit through said P channel field effect transistors AO4407, this circuit can be realized the reverse connecting protection of electric power polarity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203927459U CN202424602U (en) | 2011-10-14 | 2011-10-14 | Controller for automobile electric fuel pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203927459U CN202424602U (en) | 2011-10-14 | 2011-10-14 | Controller for automobile electric fuel pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202424602U true CN202424602U (en) | 2012-09-05 |
Family
ID=46749325
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203927459U Expired - Fee Related CN202424602U (en) | 2011-10-14 | 2011-10-14 | Controller for automobile electric fuel pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202424602U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560716A (en) * | 2013-11-15 | 2014-02-05 | 科博达技术有限公司 | Auxiliary fuel pump electric control system and method for achieving soft starting of system |
| CN104242246A (en) * | 2014-08-25 | 2014-12-24 | 江苏浩峰汽车附件有限公司 | Direct current brush motor stalling protection device and method based on current tracking |
| TWI648179B (en) * | 2016-12-02 | 2019-01-21 | 財團法人資訊工業策進會 | Alarm system and alarm method |
-
2011
- 2011-10-14 CN CN2011203927459U patent/CN202424602U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560716A (en) * | 2013-11-15 | 2014-02-05 | 科博达技术有限公司 | Auxiliary fuel pump electric control system and method for achieving soft starting of system |
| CN103560716B (en) * | 2013-11-15 | 2016-09-07 | 科博达技术有限公司 | Auxiliary fuel pump electric control system and the method realizing soft start thereof |
| CN104242246A (en) * | 2014-08-25 | 2014-12-24 | 江苏浩峰汽车附件有限公司 | Direct current brush motor stalling protection device and method based on current tracking |
| CN104242246B (en) * | 2014-08-25 | 2017-06-16 | 江苏浩峰汽车附件有限公司 | A kind of brush direct current motor rotation-clogging protection device and method based on current tracking |
| TWI648179B (en) * | 2016-12-02 | 2019-01-21 | 財團法人資訊工業策進會 | Alarm system and alarm method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120905 Termination date: 20161014 |