CN103777561B - Oxygen sensor heating control circuit - Google Patents
Oxygen sensor heating control circuit Download PDFInfo
- Publication number
- CN103777561B CN103777561B CN201210410194.3A CN201210410194A CN103777561B CN 103777561 B CN103777561 B CN 103777561B CN 201210410194 A CN201210410194 A CN 201210410194A CN 103777561 B CN103777561 B CN 103777561B
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- China
- Prior art keywords
- oxygen sensor
- electric capacity
- end switch
- diode
- ecu
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Abstract
The invention discloses a kind of oxygen sensor heating control circuit, including: low-end switch is arranged in ECU, and its one end is connected with the low side of oxygen sensor heating target, and the other end is connected with power cathode, and is connected with ECU interface chip；Described ECU interface chip is connected with the communication interface of oxygen sensor；Wherein, also including the high-end switch being arranged in ECU, its one end is connected with the high-end of oxygen sensor heating target, and the other end is connected with positive source；Described high-end switch uses PWM control mode, being adjusted input voltage, have over-current detection and function of short circuit detection, can disconnect control circuit when there is stream or short-circuit conditions.The oxygen sensor heating control circuit of the present invention can realize double-ended control (high-end control, low side control) to oxygen sensor; oxygen sensor heating voltage amplitude can be controlled within the limiting voltage allowed; being avoided that the generation of the bigger situation of heating voltage ripple, the shorted to earth that can cause heating pin carries out power-off protection.
Description
Technical field
The present invention relates to vehicle electric field, particularly relate to a kind of oxygen sensor heating control circuit.
Background technology
Electric jet vehicle, for obtaining high exhaust gas purification rate, reduces (CO) carbon monoxide in aerofluxus, (HC) Hydrocarbon and (NOx)
Oxynitride composition, it is necessary to utilize ternary catalyzing unit.Using on the ternary catalyzing unit electromotor with minimizing exhaust pollution,
Oxygen sensor is requisite element.Due to the air-fuel ratio once deviation theory air-fuel ratio of gaseous mixture, three-way catalyst pair
The detergent power of CO, HC and NOx will drastically decline, therefore install oxygen sensor in exhaustor, in order to detect oxygen in aerofluxus
Concentration, and send feedback signal to ECU, then controlled the increase and decrease of fuel injector distributive value by ECU, thus by gaseous mixture
Air-fuel ration control is near theoretical value.
Existing oxygen sensor heating control circuit uses the mode of single-ended control for heating target；That is, one termination controls
Circuit, other end ground connection, be referred to as high-end control；Or a termination power, other end connection control circuit, it is referred to as low side
Control.The operating temperature of oxygen sensor can carry out table by the process of special chip CJ125 by oxygen sensor characteristic impedance
Levy out, existing oxygen sensor heating control circuit (as a example by low side control), as shown in Figure 1.
Existing oxygen sensor interface chip, computer heating control is frequently with low side control, within its control frequency is limited at 2Hz.
For oxygen sensor, its heating voltage is rated for 9V, the highest not can exceed that 12V.Due to oxygen sensor supply voltage scope
From for 9V to 16V, and heating voltage not can exceed that 12V.With prior art, the method meeting this requirement can only be right
Low side uses PWM to control.Pulse width modulation (PWM), is the abbreviation of English " Pulse Width Modulation ",
Be called for short pulsewidth modulation, it is simply that the microprocessor different pulse signal width of output, integrated after be converted into the mould of different amplitude
Intend signal.Pulse is the narrowest, then analogue signal amplitude is the lowest；Pulse is the widest, then amplitude is the highest.Owing to input voltage is different,
The impulse wave of single-chip microcomputer output different in width, makes output stable at 9V.Further, the average electricity at heating target two ends it is input to
Pressure, it is necessary within being limited in certain amplitude range.Within being limited at 2Hz due to control frequency, so the waveform of output,
Ripple is relatively big, when power supply is more than 12V, there is the spike exceeding heating voltage ultimate value.
Even if using low side control mode, its high-end H+ still needs to connect power supply, the connected mode of existing oxygen sensor rat tail
For heating target two ends by wire harness, enter control circuit place ECU；ECU by other wire harness, is connected with power supply again.
So the high-end H+ of heating target and the connection of power supply, carry out inside ECU.In view of heating target it is and ECU
Being joined directly together, the most once its each pin (including H+) shorted to earth, caused consequence, be that ECU internal electric source is short
Road, causes equipment to damage.
Summary of the invention
The technical problem to be solved in the present invention is to provide one can realize double-ended control (high-end control, low side to oxygen sensor
Control) oxygen sensor heating control circuit, can control oxygen sensor heating voltage amplitude allow limiting voltage within,
Being avoided that the generation of the bigger situation of heating voltage ripple, the shorted to earth that can cause heating pin carries out power-off protection.
For solving above-mentioned technical problem, the oxygen sensor heating control circuit of the present invention, including: low-end switch is arranged on ECU
In, its one end is connected with the low side of oxygen sensor heating target, and the other end is connected with power cathode, and with ECU interface core
Sheet is connected；Described ECU interface chip is connected with the communication interface of oxygen sensor；Wherein, also include being arranged in ECU
High-end switch, its one end is connected with the high-end of oxygen sensor heating target, and the other end is connected with positive source；Described high-end
Switch uses PWM control mode, can be adjusted input voltage, have over-current detection and function of short circuit detection, is sending out
Control circuit can be disconnected when giving birth to stream or short-circuit conditions.
Described high-end switch is the integrated high-end switch of Infineon BTS6133D, and two outfan parallel connection is followed by heating target
High-end, and by the first diode D1, the first electric capacity C1, the second electric capacity C2 and the 3rd electric capacity C3 ground connection；
Wherein, described high-end switch output termination the first diode D1 negative pole, the second electric capacity C2 anode and the 3rd electric capacity C3
Anode, the first diode D1 positive pole, the negative terminal of the second electric capacity C2 and the negativing ending grounding of the 3rd electric capacity C3；
The power end of described high-end switch connects power supply by the second diode D2, by the 4th electric capacity C4, the 5th electric capacity C5
With the 3rd diode D3 ground connection；
Wherein, the second diode D2 positive pole connects power supply, and the second diode D2 negative pole connects the power end of described high-end switch；
3rd diode D3 plus earth, its negative pole connects the power end of described high-end switch.
Wherein, described low-end switch is NMOS tube N1, its source ground and connect described heating target by electric capacity C6
Low side, its drain electrode connects the low side of described heating target and connects ECU interface chip by the first resistance R1, its grid
Connect ECU interface chip and by the second resistance R2 and the 3rd resistance R3 ground connection.
The present invention, under conditions of existing low side controls, uses double-ended control, the i.e. two ends to heating target, takes simultaneously
The mode controlled.Being additionally arranged an intelligent high-end switch in ECU, positive source is after wire harness input ECU, through being somebody's turn to do
High-end switch exports, then is connected to the high-end H+ of heating target by wire harness.This high-end switch uses PWM control mode,
The voltage of input can be adjusted to satisfactory numerical value, to guarantee that it is less than the receptible maximum voltage of sensor
Value.Owing to PWM wave energy uses higher frequency, so its output waveform is the most smooth, ripple is little.This is high-end opens
Closing is intelligent switch, carries stream and short-circuit detecting.Once heating target crosses stream, or its high-end H+ shorted to earth, then
High-end switch is reported to the police immediately, can disconnect control circuit.For the control of heating target low side, due to low-end switch and interface
The connection of chip, it has been determined that so remaining stationary as, it controls frequency and also maintains inconvenience on hardware.
Accompanying drawing explanation
The present invention is further detailed explanation with detailed description of the invention below in conjunction with the accompanying drawings:
Fig. 1 is the structural representation of a kind of existing oxygen sensor heating control circuit, the connection of its display low side control mode
Structure.
Fig. 2 is the structural representation of the present invention.
Fig. 3 is the structural representation of high-end switch one embodiment of the present invention.
Fig. 4 is the structural representation of low-end switch one embodiment of the present invention.
Description of reference numerals
H+ is the high-end of heating target
H-is the low side of heating target
D1 is the first diode
D2 is the second diode
D3 is the 3rd diode
C1 is the first electric capacity
C2 is the second electric capacity
C3 is the 3rd electric capacity
C4 is the 4th electric capacity
C5 is the 5th electric capacity
C6 is the 6th electric capacity
R1 is the first resistance
R2 is the second resistance
R3 is the 3rd resistance
N1 is NMOS tube
Out is high-end switch outfan
Vcc is high-end switch power end
Gnd is ground
Detailed description of the invention
As in figure 2 it is shown, the oxygen sensor heating control circuit of the present invention, it is arranged in ECU including low-end switch, one
End is connected with the low side H-of oxygen sensor heating target, and the other end is connected with power cathode, and is connected with ECU interface chip；
Described ECU interface chip is connected with the communication interface of oxygen sensor；Also include the high-end switch being arranged in ECU, one
End is connected with the high-end H+ of oxygen sensor heating target, and the other end is connected with positive source；Described high-end switch uses PWM
Control mode, can be adjusted input voltage, has over-current detection and function of short circuit detection, and stream or short circuit were occurring
Control circuit can be disconnected during situation.
As it is shown on figure 3, high-end switch one embodiment of the present invention, high-end switch is that Infineon BTS6133D is integrated high-end to be opened
Closing, two outfan parallel connection is followed by the high-end of heating target, and by the first diode D1, the first electric capacity C1,
Second electric capacity C2 and the 3rd electric capacity C3 ground connection；
Wherein, described high-end switch output termination the first diode D1 negative pole, the second electric capacity C2 anode and the 3rd electric capacity C3
Anode, the first diode D1 positive pole, the negative terminal of the second electric capacity C2 and the negativing ending grounding of the 3rd electric capacity C3；
The power end of described high-end switch connects power supply by the second diode D2, by the 4th electric capacity C4, the 5th electric capacity C5
With the 3rd diode D3 ground connection；
Wherein, the second diode D2 positive pole connects power supply, and the second diode D2 negative pole connects the power end of described high-end switch；
3rd diode D3 plus earth, its negative pole connects the power end of described high-end switch.
As shown in Figure 4, described low-end switch is NMOS tube N1, its source ground and by electric capacity C6 connect described in add
The low side of heat target, its drain electrode connects the low side of described heating target and connects ECU interface chip by the first resistance R1,
Its grid connects ECU interface chip and by the second resistance R2 and the 3rd resistance R3 ground connection.
Above by detailed description of the invention and embodiment, the present invention is described in detail, but these have not been constituted this
The restriction of invention.Without departing from the principles of the present invention, those skilled in the art it may also be made that many deformation and changes
Entering, these also should be regarded as protection scope of the present invention.
Claims (2)
1. an oxygen sensor heating control circuit, including: low-end switch is arranged in ECU, and its one end is connected with the low side of oxygen sensor heating target, and the other end is connected with power cathode, and is connected with ECU interface chip；Described ECU interface chip is connected with the communication interface of oxygen sensor；It is characterized in that: also include the high-end switch being arranged in ECU, its one end is connected with the high-end of oxygen sensor heating target, and the other end is connected with positive source；Described high-end switch uses PWM control mode, being adjusted input voltage, have over-current detection and function of short circuit detection, can disconnect control circuit when there is stream or short-circuit conditions；
Two the outfan parallel connections of described high-end switch are followed by the high-end of heating target, and by the first diode (D1), the first electric capacity (C1), the second electric capacity (C2) and the 3rd electric capacity (C3) ground connection；
Wherein, described high-end switch output termination the first diode (D1) negative pole, the second electric capacity (C2) anode and the 3rd electric capacity (C3) anode, the first diode (D1) positive pole, the negative terminal of the second electric capacity (C2) and the negativing ending grounding of the 3rd electric capacity (C3)；
The power end of described high-end switch connects power supply, by the 4th electric capacity (C4), the 5th electric capacity (C5) and the 3rd diode (D3) ground connection by the second diode (D2)；
Wherein, the second diode (D2) positive pole connects power supply, and the second diode (D2) negative pole connects the power end of described high-end switch；
3rd diode (D3) plus earth, its negative pole connects the power end of described high-end switch；
Described high-end switch is the integrated high-end switch of Infineon BTS6133D.
2. oxygen sensor heating control circuit as claimed in claim 1, it is characterized in that: described low-end switch is a NMOS tube (N1), its source ground and connect the low side of described heating target by the 6th electric capacity (C6), its drain electrode connects the low side of described heating target and connects ECU interface chip by the first resistance (R1), and its grid connects ECU interface chip and by the second resistance (R2) and the 3rd resistance (R3) ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210410194.3A CN103777561B (en) | 2012-10-24 | 2012-10-24 | Oxygen sensor heating control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210410194.3A CN103777561B (en) | 2012-10-24 | 2012-10-24 | Oxygen sensor heating control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103777561A CN103777561A (en) | 2014-05-07 |
| CN103777561B true CN103777561B (en) | 2016-12-07 |
Family
ID=50569937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210410194.3A Expired - Fee Related CN103777561B (en) | 2012-10-24 | 2012-10-24 | Oxygen sensor heating control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103777561B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101081133A (en) * | 2006-05-30 | 2007-12-05 | 陆思烨 | Far-infrared heat-generating and warm-keeping type quilt and blanket |
| CN102454496A (en) * | 2010-10-28 | 2012-05-16 | 上海航天汽车机电股份有限公司 | Universal interface circuit for oxygen sensor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8335604B2 (en) * | 2010-03-12 | 2012-12-18 | GM Global Technology Operations LLC | Control system and method for oxygen sensor heater control in a hybrid engine system |
-
2012
- 2012-10-24 CN CN201210410194.3A patent/CN103777561B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101081133A (en) * | 2006-05-30 | 2007-12-05 | 陆思烨 | Far-infrared heat-generating and warm-keeping type quilt and blanket |
| CN102454496A (en) * | 2010-10-28 | 2012-05-16 | 上海航天汽车机电股份有限公司 | Universal interface circuit for oxygen sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103777561A (en) | 2014-05-07 |
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20161207 Termination date: 20211024 |