CN209894916U - Glow plug testing device - Google Patents
Glow plug testing device Download PDFInfo
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- CN209894916U CN209894916U CN201821987713.1U CN201821987713U CN209894916U CN 209894916 U CN209894916 U CN 209894916U CN 201821987713 U CN201821987713 U CN 201821987713U CN 209894916 U CN209894916 U CN 209894916U
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Abstract
The utility model relates to a glow plug testing arrangement, including a test circuit module, it includes power supply circuit, reference voltage circuit, comparator circuit and fault indication circuit, and power supply circuit provides the power, reference voltage circuit electricity is connected the comparator circuit, reference voltage circuit provides reference voltage, comparator circuit electricity is connected fault indication circuit, control fault indication circuit give according to the testing result and instruct. The utility model has the advantages that: the testing device can test whether the glow plug has faults or not, can test whether the cylinder cover is normally grounded or not, and is simple in structure, convenient to test, accurate in test result and low in cost.
Description
Technical Field
The utility model relates to a glow plug testing arrangement belongs to the test circuit field.
Background
The glow plug is a common electrical component in an automobile and is mainly used for preheating air inlet of an engine, heating fuel oil and the like, so that the cold starting performance of the engine is improved.
When the glow plug breaks down, if the resistance is increased, the current is reduced, so that the heating power is reduced, and the original function cannot be realized. If the resistance value is reduced, the phenomenon similar to short circuit occurs, the original function cannot be realized, and the power supply series can be damaged. The existing diagnostic methods are generally amperometric detection and resistance detection. The current detection method is to detect the current in the loop when the glow plug works, however, the current of the glow plug is not directly detected because the glow plug is generally indirectly controlled by a relay and does not pass through an electric control unit; the detection is carried out by adopting a series resistor mode, a resistor with high precision and low resistance value is required to be used, the cost is higher, and the circuit is more complex. The resistance detection method is to detect the resistance of the glow plug, a power supply needs to be additionally provided for the glow plug, the resistance value of the glow plug is smaller (between 1 and 2 omega) under normal conditions, weak detection signals need to be amplified, a microprocessor is used for analyzing and processing the signals, and a measurement result is displayed through an LCD (liquid crystal display), so that the circuit is complex and the cost is higher. The product made by the two methods has higher price and is difficult to be accepted by the market.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a glow plug testing arrangement, it not only can test whether the glow plug has the trouble, can also test whether the cylinder head is normally grounded, and simple structure, and the test is convenient, and the test result is accurate, and is with low costs.
The technical scheme of the utility model as follows:
a glow plug testing device comprises a testing circuit module, a power supply module and a fault indication module, wherein the testing circuit module comprises a power supply circuit, a reference voltage circuit, a comparator circuit and a fault indication circuit, the power supply circuit supplies power for the reference voltage circuit, the comparator circuit and the fault indication circuit, the reference voltage circuit is electrically connected with the comparator circuit, and the comparator circuit is electrically connected with the fault indication circuit; the reference voltage circuit provides a reference voltage Verf, the comparator circuit comprises a first comparator U2A and a second comparator U2B, the in-phase end of the first comparator U2A and the inverting end of the second comparator U2B are both connected with a detection end R and are also connected with the reference voltage Verf through a resistor R2, the inverting end series resistor R8 of the second comparator U2B is connected with the reference voltage Verf, the inverting end of the second comparator U2B is also connected with the ground through an adjustable resistor VR2, the inverting end series resistor R13 of the first comparator U2A is connected with the reference voltage Verf, the inverting end of the first comparator U2A is also connected with the ground through the adjustable resistor VR1, the output ends of the first comparator U2A and the second comparator U2B are both connected with the fault indication circuit, and the fault indication circuit is controlled to give an indication according to the detection result.
Preferably, the inverting terminal of the first comparator U2A is connected in series with the resistor R13, and then connected in series with the negative temperature coefficient thermistor PTC1, and then connected to the reference voltage Verf, and the thermistor PTC1 is further connected in parallel with a resistor R25.
Preferably, the fault indication circuit is an LED indication circuit, the output end of the second comparator U2B is connected to the base of a triode Q2, the collector of the triode Q2 is connected to the power supply circuit after being connected to the LED4 in series, the output end of the second comparator U2B is also connected to the base of a triode Q4 in series, the collector of the triode Q4 is connected to the power supply circuit after being connected to the LED2 in series, the collector of the triode Q4 is also connected to the diode D3 and the LED1 in series and then is grounded, and the positive electrode of the LED1 is also connected to the power supply circuit; the output end of the first comparator U2A is respectively connected with the base of a triode Q3 and the anode of a diode D9, the collector of the triode Q3 is connected with a power supply circuit after being connected with an LED3 in series, the cathode of the diode D9 is connected with the base of a triode Q4, and the emission sets of the triodes Q2, Q3 and Q4 are all grounded; the LED1 is a glow plug normal indicator, the LED2 is a glow plug fault indicator, the LED3 is an open-circuit indicator, and the LED4 is a short-circuit indicator.
Preferably, the reference voltage circuit comprises a common anode diode D10 and a voltage regulator tube ZD1, the anode of the common anode diode D10 is connected with the power supply circuit, a cathode of the common anode diode D10 is connected with the inverting terminal of the voltage regulator tube ZD1, the forward terminal of the voltage regulator tube ZD1 is grounded, and the output of the other cathode of the common anode diode D10 is used as the reference voltage Verf.
Preferably, the power supply circuit comprises a positive end V + for connecting with the positive electrode of the battery, and a negative end V-for connecting with the negative electrode of the battery, the positive end V + is connected with a switch button TEST in series, the switch button TEST is connected with a three-terminal voltage regulator tube U1, and the output end of the three-terminal voltage regulator tube U1 provides power for the reference voltage circuit, the comparator circuit and the fault indication circuit. The positive end V + is connected with the thermistor PTC2 and then is respectively connected with the switch button TEST and a bidirectional real-variant diode D1, and the negative end V-and the other end of the bidirectional real-variant diode D1 are both grounded.
Preferably, the glow plug testing device further comprises a shell, two clamps and a TEST meter pen, the TEST circuit module is arranged in the shell, the LED1, the LED2, the LED3, the LED4 and the switch key TEST are all embedded in the shell, one of the clamps is connected with the positive end V + through a wire, the other clamp is connected with the negative end V-through a wire, and the TEST meter pen is connected with the detection end R through a wire.
Preferably, the glow plug testing device further comprises an alligator clip connected with the test meter pen.
The utility model discloses following beneficial effect has:
1. the glow plug testing device of the utility model is powered by the automobile storage battery, and a battery is not required to be additionally arranged;
2. the utility model discloses the glow plug testing arrangement only needs the anodal connecting terminal of disconnection glow plug, need not whole pull down again to measure, still can inspect the ground connection condition of cylinder head;
3. the glow plug testing device of the utility model can accurately judge the quality of the glow plug only by applying a weak voltage signal to the glow plug, and does not need to judge through a complex circuit by detecting the current in a loop when the glow plug works, so that the glow plug testing device is safer and more reliable when testing with lower cost;
4. the utility model discloses glow plug testing arrangement only needs several LED lamps can test out the open circuit of glow plug fast, short circuit or the normal state of quality, and the test is convenient, and the test result is accurate, and passes through temperature compensation circuit, further strengthens environmental suitability, needn't handle the test result through complicated circuit and now show by LCD.
5. The utility model discloses glow plug testing arrangement tests sampling voltage and comparative voltage and reference voltage is positive correlation when the comparison is tested, and reference voltage's change influences lessly to the measuring result to the great degree ground has improved measurement stability and reliability.
6. The utility model discloses the available crocodile of glow plug testing arrangement presss from both sides rotatory test meter pen of installing for the test is more convenient.
Drawings
Fig. 1 is a schematic block diagram of a test circuit module according to the present invention;
fig. 2 is an electrical schematic diagram of the comparator circuit and the fault indication circuit of the present invention;
fig. 3 is an electrical schematic diagram of the reference voltage circuit of the present invention;
FIG. 4 is an electrical schematic diagram of the power supply circuit of the present invention;
fig. 5 is a schematic structural diagram of the present invention.
The reference numbers in the figures denote:
10. a power supply circuit; 20. a reference voltage circuit; 30. a comparator circuit; 40. a fault indication circuit; 50. a green light; 60. a red light; 70. a yellow open circuit indicator light; 80. a yellow short circuit indicator light; 90. a test meter pen; 100. a clip; 101. a crocodile clip; 102. a housing; 103. a button.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 and fig. 2, a glow plug testing apparatus includes a testing circuit module, which includes a power supply circuit 10, a reference voltage circuit 20, a comparator circuit 30 and a fault indication circuit 40, wherein the power supply circuit 10 supplies power to the reference voltage circuit 20, the comparator circuit 30 and the fault indication circuit 40, the reference voltage circuit 20 is electrically connected to the comparator circuit 30, and the comparator circuit 30 is electrically connected to the fault indication circuit 40; the reference voltage circuit 20 provides a reference voltage Verf, the comparator circuit 30 includes a first comparator U2A and a second comparator U2B, the in-phase terminal of the first comparator U2A and the inverting terminal of the second comparator U2B are both connected to a detection terminal R and are also connected to the reference voltage Verf through a resistor R2, the inverting terminal series resistor R8 of the second comparator U2B is connected to the reference voltage Verf, the inverting terminal of the second comparator U2B is also connected to the ground through an adjustable resistor VR2, the inverting terminal series resistor R13 of the first comparator U2A is connected to the reference voltage Verf, the inverting terminal of the first comparator U2A is also connected to the ground through an adjustable resistor VR1, the output terminals of the first comparator U2A and the second comparator U2B are both connected to the fault indication circuit 40, and the control fault indication circuit 40 gives an indication according to the detection result.
The inverting terminal of the first comparator U2A is connected in series with the resistor R13, and then connected in series with a thermistor PTC1 with a negative temperature coefficient, and then connected to the reference voltage Verf. Generally, a resistor R25 is connected in parallel to the thermistor PTC1 to meet the requirement of voltage drop. The PTC1 adopts negative temperature coefficient thermistor for temperature compensation, so that the device can be normally used in the environment of-10 ℃ to 50 ℃.
Referring to fig. 2, the fault indication circuit 40 is an LED indication circuit, an output end of the second comparator U2B is connected to a base of a triode Q2, a collector of the triode Q2 is connected to a power supply circuit 10 after being connected to an LED4 (yellow short-circuit indicator lamp 80) in series, an output end of the second comparator U2B is further connected to a base of a triode Q4 in series, a collector of the triode Q4 is connected to a power supply circuit 10 after being connected to an LED2 (red lamp 60) in series, a collector of the triode Q4 is further connected to a diode D3 and an LED1 (green lamp 50) in series and then is grounded, and an anode of the LED1 is further connected to the power supply circuit 10; the output end of the first comparator U2A is respectively connected with the base of a triode Q3 and the anode of a diode D9, the collector of the triode Q3 is connected with an LED3 in series and then is connected with a power supply circuit 10, the cathode of the diode D9 is connected with the base of a triode Q4, and the emission sets of the triodes Q2, Q3 and Q4 are all grounded. In this embodiment, an LED1 green light 50, an LED2 red light 60, an LED3 yellow open-circuit light 70, and an LED4 yellow short-circuit light 80 are taken as examples.
Referring to fig. 3, the reference voltage circuit 20 includes a common anode diode D10 and a voltage regulator ZD1, an anode of the common anode diode D10 is connected to the power supply circuit 10, a cathode of the common anode diode D10 is connected to an inverting terminal of the voltage regulator ZD1, a forward terminal of the voltage regulator ZD1 is grounded, an output of another cathode of the common anode diode D10 is used as a reference voltage Verf, and the common anode diode D10 plays a role of a protection circuit when the test pen 90 is erroneously connected to the positive electrode of the power supply.
Referring to fig. 4, the power supply circuit 10 includes a positive terminal for connecting the positive electrode of the battery, a negative terminal V-for connecting the negative electrode of the battery, the positive terminal V + is connected in series with a switch button TEST, the switch button TEST is connected to a three-terminal regulator U1, and the output terminal of the three-terminal regulator U1 provides power for the reference voltage circuit 20, the comparator circuit 30 and the fault indication circuit 40. The positive end V + is connected with the thermistor PTC2 and then is respectively connected with the switch button TEST and a bidirectional real-variant diode D1, and the negative end V-and the other end of the bidirectional real-variant diode D1 are both grounded. When the positive terminal V + and the negative terminal V-are connected to a higher voltage source, the thermistor PTC2 and the bidirectional real-variant diode D1 protect the rear-stage circuit. A diode D5 can be connected between the thermistor PTC2 and the positive end V +, and when the positive end V + and the negative end V-are reversely connected, the circuit is protected.
Referring to fig. 5, the glow plug testing device further includes a housing 102, two clips 100 and a TEST meter pen 90, the TEST circuit module is disposed in the housing 102, the LED1, the LED2, the LED3, the LED4 and the switch button TEST (as shown in fig. 5, the button 103) are all embedded in the housing 102, one of the clips 100 is connected to the positive terminal through a wire, the other clip 100 is connected to the negative terminal V-through a wire, and the TEST meter pen 90 is connected to the detection terminal R through a wire. The positive terminal V + is typically connected with a red clip 100 and the negative terminal V-is connected with a black clip 100.
Generally, an alligator clip 101 is also used to connect with the meter pen, and during testing, the alligator clip 101 is used to clip the testing end, so that the operation is more convenient.
The utility model discloses a theory of operation:
setting: the resistance of the glow plug is Rx, the resistance of the wire of the test meter pen 90 is r, then:
the input voltages of the non-inverting terminal of the comparator U2A and the inverting terminal of the comparator U2B are: ui ═ Vref (Rx + R)/(R2+ Rx + R);
the input voltage at the inverting terminal of comparator U2A is: u1 ═ Vref × VR 1/(R25/PTC 1+ R13+ VR1), where R25/PTC 1 represents the parallel resistance of R25 and PTC 1;
the input voltage of the non-inverting terminal of the comparator U2B is: u2 Vref VR2/(R8+ VR2)
Because the input voltage and the comparison voltage of the test end are positively correlated with the reference voltage Vref, the stability and the reliability of the test are further improved. Because the resistance value of the glow plug is very small and can not be ignored during testing, the lead resistance of the circuit can be equivalent to a fixed comparison resistor, thereby eliminating the influence of the lead resistance on the test result.
According to the specification of 12V/24V rated power supply of the glow plug in the national standard (JB/T8580-1997), the resistance at room temperature is not lower than 0.1 omega and 0.4 omega respectively, and now the example of 12V rated power supply of the glow plug and the resistance at room temperature is not lower than 0.4 ohm is taken as an example, the application process of the test device is explained:
the resistance value of the existing glow plug is between 1 and 2 omega under the normal condition, so that the glow plug can be judged to be in a short circuit state when the resistance value is lower than 0.3 omega, and the glow plug can be judged to be in an open circuit state when the resistance value is higher than 4 omega.
The resistance RX of the glow plug can be replaced by a standard resistance when producing the device.
During debugging, the red clamp 100 clamps the positive pole of the power supply, and the black clamp 100 simultaneously clamps the negative pole of the power supply and one end of the resistor to be tested (during field detection, the power supply is the power supply on the automobile). The TEST meter pen 90 is connected with the other end of the tested resistor (namely the resistor RX) (the crocodile clip 101 can be rotatably installed on the TEST meter pen 90 to clamp the other end of the tested resistor), the TEST button is pressed, when the tested resistor is 4 omega, the adjustable resistor VR1 is adjusted, so that the LED3 (the yellow open-circuit indicator lamp 70) just shines, and when the tested resistor is 0.3 omega, the adjustable resistor VR2 is adjusted, so that the LED4 (the yellow short-circuit indicator lamp 80) just shines. When the LED3 or the LED4 lamp is lit, the LED2 (red 60) is lit at the same time, otherwise the LED1 (green 50) is lit.
During debugging, if the rated power supply of the glow plug is 24V, the TEST button is pressed, when the tested resistor is 0.07 omega, the adjustable resistor VR2 is adjusted, so that the LED4 (yellow short-circuit indicator lamp 80) just shines, and when the tested resistor is 4 omega, the adjustable resistor VR1 is adjusted, so that the LED3 (yellow open-circuit indicator lamp 70) just shines.
When the glow plug is used on site, the glow plug is tested by only disconnecting the positive connecting terminal of the glow plug, and then connecting the red clamp 100 to the positive pole of the automobile battery and connecting the black clamp 100 to the negative pole of the automobile battery. The probe of the test stylus 90 is placed on the positive terminal of the glow plug. When the glow plug is in a short-circuit state (the resistance value is less than 0.3 omega), the comparator U2B outputs voltage, only the triode Q2 and the triode Q4 are conducted, and the LED2 (red lamp 60) and the LED4 (yellow short-circuit indicator lamp 80) are on; when the glow plug is in an open circuit state (the resistance value is larger than 4 omega), the comparator U2A outputs voltage, only the triode Q3 and the triode Q4 are conducted, and the LED2 (red light 60) and the LED4 (yellow open circuit indicator light 70) are lighted; when the glow plug is in a normal state (when the resistance value is between 0.3 and 4 omega), the comparator U2B and the comparator U2A have no output, the triode Q2, the triode Q3 and the triode Q4 are all cut off, at the moment, the power supply supplies power to the LED1 (the green lamp 50), and the LED1 is bright.
The invention can also be used to test the cylinder head grounding situation, operating as follows: the red clip 100 is first connected to the positive pole of the car battery and the black clip 100 is connected to the negative pole of the car battery (the negative pole of the battery is connected to ground). Placing the probe of the TEST meter pen 90 on the cylinder cover close to the hot fire plug, then pressing a 'TEST' key, if the connection between the cylinder cover and the ground wire is normal, the resistance value of the resistor between the cylinder cover and the ground wire is less than 0.3 omega, and the LED2 (red light 60) and the LED4 (yellow short-circuit indicator light 80) are lightened; if the open circuit exists between the cylinder cover and the ground wire, the resistance value between the cylinder cover and the ground wire is far larger than 4 omega, and the LED2 (the red lamp 60) and the LED3 (the yellow open circuit indicator lamp 70) are lightened; if there is poor contact between the cylinder head and ground, LED1 (green light 50) is lit.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (7)
1. A glow plug testing device comprises a testing circuit module, and is characterized in that: the test circuit module comprises a power supply circuit (10), a reference voltage circuit (20), a comparator circuit (30) and a fault indication circuit (40), wherein the power supply circuit (10) supplies power to the reference voltage circuit (20), the comparator circuit (30) and the fault indication circuit (40), the reference voltage circuit (20) is electrically connected with the comparator circuit (30), and the comparator circuit (30) is electrically connected with the fault indication circuit (40); the reference voltage circuit (20) provides a reference voltage Verf, the comparator circuit (30) comprises a first comparator U2A and a second comparator U2B, the in-phase end of the first comparator U2A and the reverse-phase end of the second comparator U2B are both connected with a detection end R and are also connected with the reference voltage Verf through a resistor R2, the in-phase end series resistor R8 of the second comparator U2B is connected with the reference voltage Verf, the in-phase end of the second comparator U2B is also connected with the ground through an adjustable resistor VR2, the reverse-phase end series resistor R13 of the first comparator U2A is connected with the reference voltage Verf, the reverse-phase end of the first comparator U2A is also connected with the ground through an adjustable resistor VR1, the output ends of the first comparator U2A and the second comparator U2B are both connected with the fault indication circuit (40), and the fault indication circuit (40) is controlled to give an indication according to the detection result.
2. A glow plug testing apparatus according to claim 1, wherein: the inverting terminal of the first comparator U2A is connected in series with the resistor R13, and then connected in series with a thermistor PTC1 with a negative temperature coefficient, and then connected to the reference voltage Verf, and the thermistor PTC1 is also connected in parallel with a resistor R25.
3. A glow plug testing apparatus according to claim 1, wherein: the fault indication circuit (40) is an LED indication circuit, the output end of the second comparator U2B is connected with the base of a triode Q2, the collector of the triode Q2 is connected with a power supply circuit (10) after being connected with an LED4 in series, the output end of the second comparator U2B is also connected with the base of a triode Q4 in series, the collector of the triode Q4 is connected with a power supply circuit (10) after being connected with an LED2 in series, the collector of the triode Q4 is also connected with a diode D3 and an LED1 in series and then is grounded, and the positive electrode of the LED1 is also connected with the power supply circuit (10); the output end of the first comparator U2A is respectively connected with the base of a triode Q3 and the anode of a diode D9, the collector of the triode Q3 is connected with an LED3 in series and then is connected with a power supply circuit (10), the cathode of the diode D9 is connected with the base of a triode Q4, and the emission sets of the triodes Q2, Q3 and Q4 are all grounded; the LED1 is a glow plug normal indicator, the LED2 is a glow plug fault indicator, the LED3 is an open-circuit indicator, and the LED4 is a short-circuit indicator.
4. A glow plug testing apparatus according to claim 1, wherein: the reference voltage circuit (20) comprises a common anode diode D10 and a voltage regulator tube ZD1, the anode of the common anode diode D10 is connected with the power supply circuit (10), the cathode of the common anode diode D10 is connected with the inverting terminal of the voltage regulator tube ZD1, the forward terminal of the voltage regulator tube ZD1 is grounded, and the output of the other cathode of the common anode diode D10 is used as a reference voltage Verf.
5. A glow plug testing apparatus according to claim 3, wherein: the power supply circuit (10) comprises a positive end V + used for being connected with the anode of the battery, a negative end V-used for being connected with the cathode of the battery, and a switch button TEST connected in series with the positive end V +, the switch button TEST is connected with a three-terminal voltage-regulator tube U1, and the output end of the three-terminal voltage-regulator tube U1 provides power for the reference voltage circuit (20), the comparator circuit (30) and the fault indication circuit (40); the positive terminal V + is connected with a thermistor PTC2 and then is respectively connected with the switch button TEST and a bidirectional real-variant diode D1, and the negative terminal V-and the other end of the bidirectional real-variant diode D1 are both grounded.
6. The glow plug testing apparatus of claim 5, wherein: the TEST circuit module is arranged in the shell (102), the LED1, the LED2, the LED3, the LED4 and the switch key TEST are embedded on the shell (102), one of the clips (100) is connected with the positive end V + through a wire, the other clip (100) is connected with the negative end V-through a wire, and the TEST meter pen (90) is connected with the detection end R through a wire.
7. The glow plug testing apparatus of claim 6, wherein: the crocodile test system also comprises an alligator clip (101) which is connected with the test meter pen (90).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821987713.1U CN209894916U (en) | 2018-11-29 | 2018-11-29 | Glow plug testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821987713.1U CN209894916U (en) | 2018-11-29 | 2018-11-29 | Glow plug testing device |
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| CN209894916U true CN209894916U (en) | 2020-01-03 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113125836A (en) * | 2021-04-15 | 2021-07-16 | 青岛汉泰智能科技有限公司 | Current probe |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113125836A (en) * | 2021-04-15 | 2021-07-16 | 青岛汉泰智能科技有限公司 | Current probe |
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