CN209637892U - Atomizer protective device - Google Patents
Atomizer protective device Download PDFInfo
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- CN209637892U CN209637892U CN201920360687.8U CN201920360687U CN209637892U CN 209637892 U CN209637892 U CN 209637892U CN 201920360687 U CN201920360687 U CN 201920360687U CN 209637892 U CN209637892 U CN 209637892U
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- Prior art keywords
- atomizer
- switch
- control
- circuit
- protective
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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
- 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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Abstract
The utility model discloses a kind of atomizer protective devices; it is connected in series between atomizer circuit and control unit; it include: comparing unit; the comparing unit detects the voltage at the inspection leakage resistance both ends, and the voltage that will test is compared with the operating voltage of the atomizer protective device and exports corresponding level signal based on comparative result；And protective switch; the protective switch is connected with the comparing unit; receive the level signal exported by the comparing unit; and on or off is carried out based on the level signal; when the comparing unit detects that the voltage for examining leakage resistance both ends is greater than the operating voltage of the atomizer protective device; the protective switch is connected to protective switch output high level signal in the comparing unit, so that second control switch be made to turn off the electric current to be truncated in the atomizer circuit.
Description
Technical field
The utility model relates to a kind of atomizer protective devices, more particularly to protect in the D-S terminal shortcircuit of flash MOS switch
Protect the atomizer protective device of atomizer.
Background technique
With the fast development of automobile industry, the performance of automobile is also receive more and more attention.Present automobile with
Intelligent, entertainment orientation electronic and electrical equipment increase, used simultaneously in running car there are many electronic equipment, lead to engine
Electric power is dispersed, and be easy to cause the signal transmitting and receiving of each sensor bad.Therefore, the protection of each electric system in automobile and guarantor
Supporting also becomes particularly important.
Electric-controlled fuel injector is most critical and most complicated component in the common rail system of internal combustion engine, and design, technology difficulty
Maximum component.ECU by control solenoid valve opening and closing, by the fuel oil in high pressure oil rail with optimal injection timing,
The combustion chamber that distributive value and fuel injection rate spray into, so that it is guaranteed that internal combustion engine continues normally to work.Therefore, in atomizer and
In atomizer circuit, need to be arranged protection mechanism to prevent it to be damaged under abnormality.
Fig. 1 shows the structure of well known atomizer circuit.As shown in the drawing, CPU by Serial Peripheral Interface (SPI) (SPI) with
Atomizer signal driving chip carries out data transmission, and issues control signal to atomizer signal driving chip.Atomizer signal drives
Dynamic chip issues control signal to atomizer circuit based on the control signal received, and the MOS switch in control circuit is to adjust
Electric current.Atomizer coil L accurately adjusts its distributive value according to the variation of the electric current received.Atomizer signal driving chip and
Atomizer circuit connection.The atomizer circuit includes: atomizer coil L；MOS switch T1, MOS switch T2 and MOS switch T3, should
Three MOS switches and atomizer coil L are connected in series, and MOS switch T1 and MOS switch T3 are connected with BOOST booster circuit；Two
Pole pipe D1 and diode D2, wherein diode D1 believes relative to atomizer coil L earth, diode D2 relative to atomizer
Number driving chip earth, the two diodes D1, D2 play the role of pulse current reflux；And inspection leakage resistance R1, it should
Three MOS switch T1, T2, T3, atomizer coil L and the atomizer signal examined in leakage resistance R1 and atomizer circuit drive core
Piece is connected in series, for detecting the electric current flowed through in atomizer circuit.
Under normal operating conditions, the fuel injection signal that CPU is issued is provided to atomizer signal driving chip, oil spout via SPI
Mouth signal driving chip generates pulse control signal based on the fuel injection signal and is supplied to the end G of MOS switch T1, MOS switch T1
The end G receive the pulse control signal after, be turned on or off according to the signal；Atomizer signal driving chip also base simultaneously
The end G that high level signal is provided to MOS switch T3 is generated in the fuel injection signal from CPU, MOS switch T3 is connected.At this point, by
MOS switch T1 in atomizer circuit is according to pulse signal on-off and MOS switch T3 constant conduction, so that entire circuit conducting
To have, electric current is flowed through to atomizer coil L and electric current is gradually increased.When the electric current for flowing through atomizer coil L increases to first
Stage specified current flow (generally average current 12A), atomizer coil L is by commencement of fuel injection.Later, CPU issues second stage
Signal is controlled, atomizer signal driving chip issues low level signal to the end G of MOS switch T1, closes MOS switch；Simultaneously
Atomizer signal driving chip also issues pulse control signal to the end G of MOS switch T2, believes that MOS switch T2 according to the pulse
Number carry out conducting shutdown.By the control of the second stage, the electric current for flowing through atomizer coil L is made to become the specified electricity of second stage
It flows (generally average current 2A), atomizer coil L starts second stage oil spout.Second stage fuel injection duration for a period of time it
Afterwards, CPU issues control signal again, and atomizer signal driving chip issues low level signal to the end G of MOS switch T2, makes MOS
Switch T2 shutdown, while atomizer signal driving chip also issues low level signal to the end G of MOS switch T3, makes MOS switch T3
Shutdown.Atomizer circuit is truncated as a result, and atomizer coil L stops oil spout.To after next oil spout node, recycle above dynamic
Make.
During the work of above-mentioned atomizer circuit, inspection leakage resistance R1 detection is flowed through the electric current of atomizer coil L and is led to
Atomizer signal driving chip is crossed by the current feedback to CPU.The electricity for flowing through atomizer coil L is detected in inspection leakage resistance R1
(it is > 15A in this example, but can also be changed according to the model of atomizer) when flowing through big, CPU receives the excessive electricity of atomizer coil
It flows signal and issues corresponding adjustment signal to atomizer signal driving chip, atomizer signal driving chip is believed according to the adjustment
Number issuing pulse adjustment signal to MOS switch T1 to reduce its switching frequency and duty ratio drops the electric current in atomizer circuit
It is low, so that atomizer coil L be protected not to be burnt.
Utility model technical problem to be solved
However, due to current technical limitation in the atomizer circuit, such as leak electricity in MOS switch under high-tension circuit
Etc. reasons, and occur often MOS switch the end D-S occur short circuit problem.When flash MOS switch (is MOS by taking Fig. 1 as an example
Switch T1) the end D-S occur short circuit when, MOS switch T1 will be unable to normally receive pulse adjustment signal.Therefore, even if spray
Oil nozzle signal driving chip, which has issued, makes MOS switch T1 reduce it by the pulse adjustment signal of switching frequency and duty ratio, should
MOS switch T1 also due to D-S terminal shortcircuit and the signal can not be received, so that control can not be adjusted correspondingly, so lose
The original on-off function of switch, reduce the electric current in atomizer circuit can not and continues to rise.Excessive electric current is by scaling loss
The MOS switch, final atomizer coil L will be also burnt because electric current is excessive.
Purpose of utility model
The utility model allows for above problem completion, and its purpose is to provide a kind of atomizer circuit protection dresses
It sets, in the D-S terminal shortcircuit of flash MOS, also can correctly control atomizer circuit makes current reduction, to protect atomizer line
Circle and other circuit components are not burnt.
Utility model content
The first aspect of the utility model is related to a kind of atomizer protective device, is connected to atomizer circuit and control unit
Between, protect the atomizer circuit not scaling loss due to electric current is excessive, the atomizer circuit includes that atomizer, the first control are opened
Close, the second control switch and inspection leakage resistance, described control unit generate control signal and export to first control switch and
Second control switch, first control switch carry out on or off based on the control signal received, together
The second control switch of Shi Suoshu is connected based on the control signal received, thus power to the atomizer, institute
It states inspection leakage resistance to detect the size for flowing through the electric current of the atomizer and feed back to described control unit, described control unit foundation
The electric current that feedback is come generates corresponding adjustment signal, and the switching frequency and duty ratio for adjusting first control switch are to reduce
The electric current in atomizer circuit is stated, which is characterised by comprising: comparing unit, comparing unit connection
Between described control unit and the inspection leakage resistance, detect it is described inspection leakage resistance voltage, the voltage that will test with it is described
The operating voltage of atomizer protective device is compared and exports corresponding level signal based on comparative result；And protection is opened
It closes, which is connected between second control switch and the comparing unit, and reception is exported by the comparing unit
The level signal, and based on the level signal carry out on or off, detect the inspection galvanic electricity in the comparing unit
When the voltage of resistance is greater than the operating voltage of the atomizer protective device, the comparing unit exports high electricity to the protective switch
The protective switch is connected in ordinary mail number, so that second control switch be made to turn off the electricity to be truncated in the atomizer circuit
Stream.
The second aspect of the utility model is the protective switch in the atomizer protective device of the first aspect
It is MOS switch.
The third aspect of the utility model is first control in the atomizer protective device of the first aspect
Switch and second control switch are MOS switches.
The fourth aspect of the utility model is the comparing unit in the atomizer protective device of the first aspect
The comparison result is also fed back into described control unit to notify.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of atomizer circuit in the prior art.
Fig. 2 is the electrical block diagram with the atomizer circuit protection device of the utility model.
Specific embodiment
In the following, being illustrated referring to attached drawing to specific embodiment of the utility model.
Fig. 2 shows the circuit structures of the atomizer circuit protection device with the utility model.The Fig. 2 is in Fig. 1 institute
On the basis of the atomizer circuit in the prior art shown, the atomizer circuit protection device of the utility model has been added (in figure
Shown in lower dotted line frame).For atomizer circuit same as the prior art and its control device here not in repeated description, under
Face is illustrated using oil spout circuit protection device as emphasis.
The atomizer circuit protection device includes a comparator Q, a MOS switch T4 and a reference resistance R2, is somebody's turn to do
Comparator Q is connected in series between CPU and inspection leakage resistance R1, and monitor current flows through voltage when examining leakage resistance R1 (hereinafter referred to as
For " circuit voltage "), the circuit voltage and Vcc voltage that will test are (that is, the operating voltage of atomizer circuit protection device, leads to
Often it is 5V) it is compared, and corresponding level signal is exported according to comparison result.MOS switch T4 is connected in series in MOS switch T3
Between comparator Q, MOS switch T4 carries out on or off according to receiving the level signal from comparator Q, and by
This control MOS switch T3 is correspondingly turned off or is connected.Reference resistance R2 is relative to comparator Q earth, for generating
The reference voltage of comparator.
In the following, being illustrated to the movement of the atomizer circuit protection device.
During the work of atomizer circuit, in the same manner as the prior art, atomizer line is flowed through in inspection leakage resistance R1 detection
It encloses the electric current of L and passes through atomizer signal driving chip for the current feedback to CPU.It is detected in inspection leakage resistance R1 and flows through spray
When the electric current of oil nozzle coil L is excessive, CPU issues corresponding adjustment signal to atomizer signal driving chip, and atomizer signal drives
Dynamic chip exports corresponding pulse adjustment signal based on the adjustment signal to reduce the switching frequency of MOS switch T1.
With the prior art the difference lies in that the utility model also has atomizer circuit protection device, in above-mentioned oil spout
While mouth circuit works, the voltage i.e. circuit of atomizer coil L is flowed through in the comparator Q detection in atomizer circuit protection device
Voltage, and the circuit voltage detected is compared with the operating voltage Vcc of the circuit protection device.If the voltage detected
Less than operating voltage Vcc, then comparator Q exports low level signal to MOS switch T4, turns off MOS switch T4, atomizer circuit
Maintain normal working condition.If the voltage detected is greater than operating voltage Vcc, comparator Q exports high electricity to MOS switch T4
MOS switch T4 is connected in ordinary mail number.Since MOS switch T4 is connected, the end the G voltage of MOS switch T3 is pulled down to low level, from
And MOS switch T3 is turned off.The shutdown of MOS switch T3 results in entire atomizer circuit and is truncated, and electric current sharply drops to 0,
It avoids high current and flows through a possibility that atomizer coil is burnt.
From the foregoing, it can be understood that compared with prior art, in the case that electric current is excessive in atomizer circuit, the utility model by
In with atomizer circuit protection device, thus can while controlling MOS switch T1 reduces it by switching frequency and duty ratio,
Control MOS switch T3 is turned it off, and is reduced so as to make the electric current in atomizer circuit more quickly, is more reliably maintained oil spout
The normal working condition of mouth circuit.
And in the case where short circuit occurs for the end D-S flash MOS switch, that is, MOS switch T1, even if MOS switch T1 can not be just
The pulse adjustment signal that often reception carrys out flow bean signal driving chip makes current reduction, the atomizer circuit in the utility model
Protective device also can turn off in time MOS switch T3, and truncation atomizer circuit makes current reduction, to protect atomizer coil
It is not burnt.
Although explaining and describing the utility model in detail in the drawings and the preceding description, this class declaration
With description be considered as it is illustrative or exemplary, and not restrictive.The description of front specifically illustrates the utility model
Embodiment.It will be appreciated, however, that the utility model can be real in many ways regardless of seeming in the text above in detail
It is existing.And the utility model is not limited to the disclosed embodiments.
Claims (4)
1. a kind of atomizer protective device, is connected between atomizer circuit and control unit, protect the atomizer circuit not because
Electric current is excessive and scaling loss,
The atomizer circuit includes atomizer, the first control switch, the second control switch and inspection leakage resistance, described control unit
The control signal of generation is output to first control switch and second control switch, and first control switch is based on
The control signal received carries out on or off, while second control switch is based on the control letter received
It number is connected, is thus powered to the atomizer, the inspection leakage resistance detection flows through the size of the electric current of the atomizer simultaneously
Feed back to described control unit, described control unit generates corresponding adjustment signal according to the electric current that feedback is come, and adjusts described the
The switching frequency and duty ratio of one control switch to reduce the electric current in the atomizer circuit, the atomizer protective device
It is characterized in that, comprising:
Comparing unit, the comparing unit are connected between described control unit and the inspection leakage resistance, detect the inspection leakage resistance
Voltage, the voltage that will test is compared with the operating voltage of the atomizer protective device and exports based on comparative result
Corresponding level signal；And
Protective switch, the protective switch are connected between second control switch and the comparing unit, are received by the ratio
On or off is carried out compared with the level signal of unit output, and based on the level signal,
When the comparing unit detects that the voltage for examining leakage resistance is greater than the operating voltage of the atomizer protective device,
The protective switch is connected to protective switch output high level signal in the comparing unit, to make second control
Electric current of the switch OFF to be truncated in the atomizer circuit.
2. atomizer protective device as described in claim 1, which is characterized in that
The protective switch is MOS switch.
3. atomizer protective device as described in claim 1, which is characterized in that
First control switch and second control switch are MOS switches.
4. atomizer protective device as described in claim 1, which is characterized in that
The comparison result is also fed back to described control unit to notify by the comparing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920360687.8U CN209637892U (en) | 2019-03-20 | 2019-03-20 | Atomizer protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920360687.8U CN209637892U (en) | 2019-03-20 | 2019-03-20 | Atomizer protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209637892U true CN209637892U (en) | 2019-11-15 |
Family
ID=68496532
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920360687.8U Active CN209637892U (en) | 2019-03-20 | 2019-03-20 | Atomizer protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209637892U (en) |
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2019
- 2019-03-20 CN CN201920360687.8U patent/CN209637892U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215126 No.255 Xinglong Street, Suzhou Industrial Park, Jiangsu Province Patentee after: Hitachi anstamo Automotive Systems (Suzhou) Co.,Ltd. Address before: 215126 No.255 Xinglong Street, Suzhou Industrial Park, Jiangsu Province Patentee before: HITACHI AUTOMOTIVE SYSTEMS (SUZHOU) Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |