CN104111129A - Water temperature sensor detection bench and a water temperature sensor detection method based on same - Google Patents

Water temperature sensor detection bench and a water temperature sensor detection method based on same Download PDF

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Publication number
CN104111129A
CN104111129A CN201410347381.0A CN201410347381A CN104111129A CN 104111129 A CN104111129 A CN 104111129A CN 201410347381 A CN201410347381 A CN 201410347381A CN 104111129 A CN104111129 A CN 104111129A
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temperature sensor
water temperature
cooling
resistance
voltage
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CN201410347381.0A
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CN104111129B (en
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唐菲
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Chery Automobile Co Ltd
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SAIC Chery Automobile Co Ltd
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Abstract

The invention provides a water temperature sensor detection bench and a water temperature sensor detection method based on same to be used for judging whether a water temperature sensor of an automotive engine loses efficacy or not. The water temperature sensor detection bench comprises a power source, an ampere meter, a fixed resistor, a voltmeter, a heating device, a first testing terminal and a second testing terminal; the first testing terminal and the second terminal are used for being connected with a water temperature sensor terminal; a positive electrode of the power source, the ampere meter, the fixed resistor and the first testing terminal are in series connection; a negative electrode of the power source is connected with the second testing terminal; two testing ends of the voltmeter are connected with the first testing terminal and the second testing terminal; the heating device is provided with a water box which can accommodate a to-be-detected water temperature sensor and a heater which is used for heating fluid inside the water box; the water box is provided with a cover plate which can fix the to-be-detected water temperature sensor. The water temperature sensor detection bench is complete in detection method, not needs to set up a database and is wide in application range.

Description

Cooling-water temperature sensor detects stand and the cooling-water temperature sensor detection method based on this stand
Technical field
The present invention relates to a kind of automobile engine water temperature sensor and detect stand and the cooling-water temperature sensor detection method based on this stand, be applicable to the detection to engine water temperature sensor in automobile after-sales service process.
Background technology
The cooling-water temperature sensor of motor car engine is used for monitoring the real-time water temperature of engine, is very important sensor in motor car engine.Once cooling-water temperature sensor lost efficacy, engine electronic control system module receives wrong engine water temperature information, will cause motor car engine work undesired.Say on the contrary it, when motor car engine work is undesired, such as, under the failure conditions such as engine idle is bad, bad Acceleration, the technician of after-sale service station tends to check cooling-water temperature sensor, even directly change cooling-water temperature sensor, so just brought unnecessary claim and interests loss to automobile main frame maker.
But based on the existence conditions of after-sale service station, cannot simply and effectively judge whether cooling-water temperature sensor really lost efficacy, can not tackle without the loss bringing according to replacing cooling-water temperature sensor and make strong containment measure, therefore, provide a kind of simple and effective cooling-water temperature sensor detection stand and detection method to be necessary.
The patent No. is that the patent of invention of CN200810155361.8 has proposed a kind of cooling-water temperature sensor pick-up unit, and this invention judges that the prerequisite whether cooling-water temperature sensor lost efficacy is to contrast with a normal cooling-water temperature sensor resistance.The resistance of cooling-water temperature sensor by contrasting normal cooling-water temperature sensor and inefficacy under different water temperatures, building database, as the later stage cooling-water temperature sensor standard of passing judgment on that lost efficacy.There is following defect in this invention: 1, need to set up corresponding database for dissimilar cooling-water temperature sensor, should not manage, and need each one of the dissimilar normal water temperature sensor of long-term deposit; 2, building database needs the data accumulation of long period, cannot play the effect of judge at the Database initial stage; 3, only can detect the resistance under cooling-water temperature sensor no-load condition, can not cover the failure mode of cooling-water temperature sensor completely; 4, be only applicable to the judgement that in engine rig test process, professional person was lost efficacy to cooling-water temperature sensor, can not solve the judgement of maintenance personal to cooling-water temperature sensor in automobile application process completely.
Summary of the invention
The object of the invention is to propose a kind of cooling-water temperature sensor and detect stand and the cooling-water temperature sensor detection method based on this stand, whether lost efficacy for the cooling-water temperature sensor that judges motor car engine.
Cooling-water temperature sensor of the present invention detects stand and comprises power supply, reometer, quota resistance, voltage table, heating arrangement and the first calibrating terminal, the second calibrating terminal for joining with cooling-water temperature sensor terminal, the positive pole of described power supply, reometer, quota resistance, the first calibrating terminal series connection, the negative pole of described power supply is connected with the second calibrating terminal, and two test leads of described voltage table are connected with the first calibrating terminal, the second calibrating terminal respectively; Described heating arrangement is provided with and can holds the water tank of cooling-water temperature sensor to be tested and the well heater for liquid in heating water tank, and described water tank is provided with the cover plate that can fix cooling-water temperature sensor to be tested.
Specifically, described power supply is the stabilized voltage supply being in series by accumulator, switch and voltage stabilizer.
The cooling-water temperature sensor detection method of the cooling-water temperature sensor detection stand based on above-mentioned that the present invention proposes is as follows: under the two states that does not heat and heat at heating arrangement respectively, resistance when testing out cooling-water temperature sensor access test circuit and not accessing test circuit, if under same temperature condition, the difference of resistance value when cooling-water temperature sensor accesses test circuit and do not access test circuit is in preset range, represent that this cooling-water temperature sensor is normal, otherwise represent that this cooling-water temperature sensor breaks down.
Specifically, above-mentioned cooling-water temperature sensor detection method comprises the steps:
A: first cooling-water temperature sensor is fixed on the cover plate of heating arrangement, the following part of cooling-water temperature sensor screw thread is all immersed in the liquid in water tank, utilize resistance R L0 record between two terminals of multimeter test water temperature sensor, then cooling-water temperature sensor is connected with the first calibrating terminal, the second calibrating terminal, make stabilized voltage supply, reometer, quota resistance, cooling-water temperature sensor complete loop and to cooling-water temperature sensor energising, utilize the real time data of voltage table, reometer to calculate resistance R L1 the record between two terminals of cooling-water temperature sensor;
B: utilize the liquid in well heater heating water tank, make the fluid temperature in water tank reach predetermined temperature and keep after this preset temperature for preset time, utilize the real time data of voltage table, reometer to calculate resistance R H1 the record between two terminals of cooling-water temperature sensor, then cooling-water temperature sensor and the first calibrating terminal, the second calibrating terminal are disconnected, utilize resistance R H0 record between two terminals of multimeter test water temperature sensor;
C: if the difference of resistance R L0 and resistance R L1 in preset range, and the difference of resistance R H0 and resistance R H1 is in preset range, represents that this cooling-water temperature sensor is normal, otherwise represents that this cooling-water temperature sensor breaks down.
The method of utilizing the real time data of voltage table, reometer to calculate the resistance between two terminals of cooling-water temperature sensor has following two kinds, tester can utilize two kinds of methods calculate the resistance value between two terminals of cooling-water temperature sensor and contrast simultaneously, to avoid miscount:
1, in described A step, RL1=UL1/IL1, wherein UL1 is voltage table measured magnitude of voltage in real time, IL1 is reometer measured current value in real time; In described B step, RH1=UH1/IH1, wherein UH1 is voltage table measured magnitude of voltage in real time, IH1 is reometer measured current value in real time.
2, in described A step, RL1=UL1*R0/(U0-UL1), wherein UL1 is voltage table measured magnitude of voltage in real time, the voltage output value that U0 is stabilized voltage supply, and R0 is the resistance of described quota resistance; In described B step, RH1=UH1*R0/(U0-UH1), wherein UH1 is voltage table measured magnitude of voltage in real time, the voltage output value that U0 is stabilized voltage supply, and R0 is the resistance of described quota resistance.
In general, the fault type of automobile engine water temperature sensor has three kinds: intraware opens circuit, inner inlet after short circuit, mechanical damage, wherein open circuit and the fault of short circuit just can detect by conventional sense (under normal temperature and high temperature by the method for multimeter measuring resistance), but inner inlet is None-identified.The present invention can cover the detection and Identification of three kinds of fault types of cooling-water temperature sensor simultaneously; and detection method of the present invention does not need building database; and the scope of application is wider; automobile after-sale service station can detect the cooling-water temperature sensor of client vehicles by cooling-water temperature sensor detection stand provided by the invention and detection method; farthest reduce because of the whether quantity of the unreasonable replacing cooling-water temperature sensor of fault of None-identified cooling-water temperature sensor; thereby reduce the claim quantity of automobile main frame maker, protect the interests of each main engine plants.
Brief description of the drawings
Fig. 1 is the structure principle chart that cooling-water temperature sensor of the present invention detects stand.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is described in further detail as effect and the principle of work etc. of the mutual alignment between the shape of related each member, structure, each several part and annexation, each several part.
Embodiment 1:
As shown in Figure 1, the cooling-water temperature sensor of the present embodiment detects stand and comprises by accumulator 1, the stabilized voltage supply (output voltage is 5 ± 0.25V) that switch 2 and voltage stabilizer 3 are in series, reometer 4, quota resistance 5(resistance is 1K Ω), voltage table 7, heating arrangement 8 and the first calibrating terminal 10 for joining with cooling-water temperature sensor terminal, the second calibrating terminal 11, the positive pole of described stabilized voltage supply, reometer 4, quota resistance 5, the first calibrating terminal 10 is connected, the negative pole of described stabilized voltage supply is connected with the second calibrating terminal 11, two test leads of described voltage table 7 respectively with the first calibrating terminal 10, the second calibrating terminal 11 is connected, described heating arrangement 8 is provided with and can holds the water tank of cooling-water temperature sensor 6 to be tested and the well heater (well heater not shown in FIG.) for liquid in heating water tank, and described water tank is provided with the cover plate 9 that can fix cooling-water temperature sensor 6 to be tested.
The cooling-water temperature sensor detection method of the cooling-water temperature sensor detection stand based on above-mentioned that this example proposes is as follows: under the two states that does not heat and heat at heating arrangement 8 respectively, resistance when testing out cooling-water temperature sensor 6 and accessing test circuit and do not access test circuit, if under same temperature condition, the difference of resistance value when cooling-water temperature sensor 6 accesses test circuit and do not access test circuit is in preset range, represent that this cooling-water temperature sensor is normal, otherwise represent that this cooling-water temperature sensor breaks down.
Specifically, above-mentioned cooling-water temperature sensor detection method comprises the steps:
A: first cooling-water temperature sensor 6 is fixed on the cover plate of heating arrangement 8, the following part of cooling-water temperature sensor 6 screw threads is all immersed in the liquid in water tank, utilize resistance R L0 record between two terminals of multimeter test water temperature sensor 6, then by cooling-water temperature sensor 6 and the first calibrating terminal 10, the second calibrating terminal 11 is connected, make stabilized voltage supply, reometer 4, quota resistance 5, cooling-water temperature sensor 6 complete loops also switch on to cooling-water temperature sensor 6, utilize voltage table 7, the real time data of reometer 4 calculates resistance R L1 the record between two terminals of cooling-water temperature sensor 6, described RL1=UL1/IL1, wherein UL1 is the real-time measured magnitude of voltage of voltage table 7, IL1 is the real-time measured current value of reometer 4,
B: utilize the liquid in well heater heating water tank, make the fluid temperature in water tank reach predetermined temperature and keep after this preset temperature for preset time, utilize the real time data of voltage table 7, reometer 4 to calculate resistance R H1 the record between two terminals of cooling-water temperature sensor 6, described RH1=UH1/IH1, wherein UH1 is the real-time measured magnitude of voltage of voltage table 7, and IH1 is the real-time measured current value of reometer 4; Then cooling-water temperature sensor 6 and the first calibrating terminal 10, the second calibrating terminal 11 are disconnected, utilize resistance R H0 record between two terminals of multimeter test water temperature sensor 6;
C: if the difference of resistance R L0 and resistance R L1 in preset range, and the difference of resistance R H0 and resistance R H1 is in preset range, represents that this cooling-water temperature sensor is normal, otherwise represents that this cooling-water temperature sensor breaks down.

Claims (6)

1. a cooling-water temperature sensor detects stand, it is characterized in that comprising power supply, reometer, quota resistance, voltage table, heating arrangement and the first calibrating terminal, the second calibrating terminal for joining with cooling-water temperature sensor terminal, the positive pole of described power supply, reometer, quota resistance, the first calibrating terminal series connection, the negative pole of described power supply is connected with the second calibrating terminal, and two test leads of described voltage table are connected with the first calibrating terminal, the second calibrating terminal respectively; Described heating arrangement is provided with and can holds the water tank of cooling-water temperature sensor to be tested and the well heater for liquid in heating water tank, and described water tank is provided with the cover plate that can fix cooling-water temperature sensor to be tested.
2. cooling-water temperature sensor according to claim 1 detects stand, it is characterized in that described power supply is the stabilized voltage supply being in series by accumulator, switch and voltage stabilizer.
3. one kind is detected the cooling-water temperature sensor detection method of stand based on cooling-water temperature sensor claimed in claim 1, under the two states that it is characterized in that not heating and heating at heating arrangement respectively, resistance when testing out cooling-water temperature sensor access test circuit and not accessing test circuit, if under same temperature condition, the difference of resistance value when cooling-water temperature sensor accesses test circuit and do not access test circuit is in preset range, represent that this cooling-water temperature sensor is normal, otherwise represent that this cooling-water temperature sensor breaks down.
4. cooling-water temperature sensor detection method according to claim 3, is characterized in that comprising the steps:
A: first cooling-water temperature sensor is fixed on the cover plate of heating arrangement, the following part of cooling-water temperature sensor screw thread is all immersed in the liquid in water tank, utilize resistance R L0 record between two terminals of multimeter test water temperature sensor, then cooling-water temperature sensor is connected with the first calibrating terminal, the second calibrating terminal, make stabilized voltage supply, reometer, quota resistance, cooling-water temperature sensor complete loop and to cooling-water temperature sensor energising, utilize the real time data of voltage table, reometer to calculate resistance R L1 the record between two terminals of cooling-water temperature sensor;
B: utilize the liquid in well heater heating water tank, make the fluid temperature in water tank reach predetermined temperature and keep after this preset temperature for preset time, utilize the real time data of voltage table, reometer to calculate resistance R H1 the record between two terminals of cooling-water temperature sensor, then cooling-water temperature sensor and the first calibrating terminal, the second calibrating terminal are disconnected, utilize resistance R H0 record between two terminals of multimeter test water temperature sensor;
C: if the difference of resistance R L0 and resistance R L1 in preset range, and the difference of resistance R H0 and resistance R H1 is in preset range, represents that this cooling-water temperature sensor is normal, otherwise represents that this cooling-water temperature sensor breaks down.
5. cooling-water temperature sensor detection method according to claim 4, is characterized in that in described A step, RL1=UL1/IL1, and wherein UL1 is voltage table measured magnitude of voltage in real time, IL1 is reometer measured current value in real time; In described B step, RH1=UH1/IH1, wherein UH1 is voltage table measured magnitude of voltage in real time, IH1 is reometer measured current value in real time.
6. cooling-water temperature sensor detection method according to claim 4, it is characterized in that in described A step RL1=UL1*R0/(U0-UL1), wherein UL1 is voltage table measured magnitude of voltage in real time, U0 is the voltage output value of stabilized voltage supply, and R0 is the resistance of described quota resistance; In described B step, RH1=UH1*R0/(U0-UH1), wherein UH1 is voltage table measured magnitude of voltage in real time, the voltage output value that U0 is stabilized voltage supply, and R0 is the resistance of described quota resistance.
CN201410347381.0A 2014-07-21 2014-07-21 Cooling-water temperature sensor detection method Active CN104111129B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108593147A (en) * 2018-08-03 2018-09-28 柴德维 A kind of detection device suitable for water temperature sensor
CN108692942A (en) * 2018-05-24 2018-10-23 奇瑞汽车股份有限公司 A kind of engine sensor detecting system and detection method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101216356A (en) * 2007-01-04 2008-07-09 海尔集团公司 Temperature sensor failure testing method and apparatus
CN201672994U (en) * 2010-05-31 2010-12-15 南京工程学院 Automobile coolant temperature sensor testing device
CN202403837U (en) * 2012-01-09 2012-08-29 中山市铧禧电子科技有限公司 Temperature sensor detecting platform

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101216356A (en) * 2007-01-04 2008-07-09 海尔集团公司 Temperature sensor failure testing method and apparatus
CN201672994U (en) * 2010-05-31 2010-12-15 南京工程学院 Automobile coolant temperature sensor testing device
CN202403837U (en) * 2012-01-09 2012-08-29 中山市铧禧电子科技有限公司 Temperature sensor detecting platform

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108692942A (en) * 2018-05-24 2018-10-23 奇瑞汽车股份有限公司 A kind of engine sensor detecting system and detection method
CN108593147A (en) * 2018-08-03 2018-09-28 柴德维 A kind of detection device suitable for water temperature sensor

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