CN108518265B - System and method for judging mechanical failure of urea heating electromagnetic valve and automobile - Google Patents
System and method for judging mechanical failure of urea heating electromagnetic valve and automobile Download PDFInfo
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- CN108518265B CN108518265B CN201810271192.8A CN201810271192A CN108518265B CN 108518265 B CN108518265 B CN 108518265B CN 201810271192 A CN201810271192 A CN 201810271192A CN 108518265 B CN108518265 B CN 108518265B
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- urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a system and a method for judging mechanical failure of a urea heating electromagnetic valve and an automobile, wherein the system for judging mechanical failure of the urea heating electromagnetic valve comprises a urea box temperature sensor, an environment temperature sensor and a control device, the control device judges whether the temperature of a urea solution in a urea box is greater than or equal to a first preset temperature value, whether the temperature rise rate of the urea box is greater than or equal to a first preset calibration value and whether the environment temperature is less than the solution temperature of the urea box, and if so, the urea box is judged to have abnormal heating. And then, the control device controls the heating electromagnetic valve to be switched on and off for a first preset time, and tries to repair the mechanical fault, and if the temperature of the urea solution in the urea box detected by the urea box temperature sensor is higher than a first preset temperature value, the control device reports that the heating electromagnetic valve is in mechanical failure. The method can judge the mechanical failure of the urea heating electromagnetic valve, and avoids the cracking of the urea box caused by the continuous heating of the urea box by the engine coolant.
Description
Technical Field
The invention relates to the technical field of automobile anti-freezing systems, in particular to a system and a method for judging mechanical failure of a urea heating electromagnetic valve and an automobile.
Background
In the SCR aftertreatment technology, a urea solution is injected into the exhaust pipe and hydrolyzed at high temperature to form NH3, which reduces NOx in the exhaust gas. At present, the urea solution freezes below-11 ℃, engine cooling liquid is generally used as a heating source for unfreezing, and a heating electromagnetic valve of a urea box is a component for controlling the on-off of the cooling liquid.
The urea box heating electromagnetic valve has mechanical faults, for example, when the urea box heating electromagnetic valve is stuck or impurities are stuck on a film to cause incomplete closing, the urea box heating electromagnetic valve can be in a normally open state due to unfreezing of urea, and in summer and other high-temperature days, the urea box is always heated by engine coolant, so that the urea box is cracked and other faults are caused.
Therefore, how to judge the mechanical failure of the urea heating electromagnetic valve and avoid the cracking of the urea tank caused by the continuous heating of the urea tank by the engine coolant is a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of the above, a first object of the present invention is to provide a system for determining a mechanical failure of a urea heating solenoid valve, so as to determine the mechanical failure of the urea heating solenoid valve and avoid cracking of a urea tank caused by continuous heating of the urea tank by an engine coolant.
The second purpose of the invention is to provide a method for judging the mechanical failure of the urea heating electromagnetic valve.
A third object of the present invention is to provide an automobile.
In order to achieve the first object, the present invention provides the following solutions:
a system for determining mechanical failure of a urea heating solenoid, comprising:
the temperature sensor of the urea box is arranged in the urea solution of the urea box, the engine is provided with a circulating pipeline, an inlet of the circulating pipeline is communicated with a cooling liquid outlet of the engine, an outlet of the circulating pipeline is communicated with a cooling liquid inlet of the engine, the circulating pipeline is immersed in the urea solution of the urea box, and the circulating pipeline is also provided with a heating electromagnetic valve for controlling the on-off of the circulating pipeline;
an ambient temperature sensor capable of measuring an ambient temperature outside the urea tank;
the urea box temperature sensor, the environment temperature sensor and the heating electromagnetic valve are in signal connection with the control device;
when the urea solution temperature of urea case is greater than or equal to first preset temperature value, the temperature rise rate of urea case is greater than or equal to first preset calibration value, just ambient temperature is less than during the solution temperature of urea case, controlling means can control heating solenoid valve break-make is first predetermineeing the time, and works as the urea solution temperature of urea case is greater than during the first preset temperature value, controlling means can report heating solenoid valve mechanical failure.
Preferably, in the system for judging the mechanical failure of the urea heating solenoid valve, the environment temperature sensor is mounted on an outer side wall of the urea tank.
Preferably, in the system for judging the mechanical failure of the urea heating electromagnetic valve, an alarm is further included;
the alarm is in signal connection with the control device, and can be controlled to give an alarm after the control device reports that the heating electromagnetic valve is mechanically out of order.
According to the technical scheme, when the system for judging the mechanical failure of the urea heating electromagnetic valve is used, the environment temperature sensor transmits the detected environment temperature signal outside the urea box and the detected temperature signal of the urea solution in the urea box to the control device, the control device judges whether the temperature of the urea solution in the urea box is larger than or equal to a first preset temperature value, whether the temperature rise rate of the urea box is larger than or equal to a first preset standard value and whether the environment temperature is smaller than the solution temperature of the urea box, and if yes, the urea box is judged to have abnormal heating. And then, the control device controls the heating electromagnetic valve to be switched on and off for a first preset time, and tries to repair the mechanical fault, and if the temperature of the urea solution in the urea box detected by the urea box temperature sensor is higher than a first preset temperature value, the control device reports that the heating electromagnetic valve is in mechanical failure. The system for judging the mechanical failure of the urea heating electromagnetic valve can judge the mechanical failure of the urea heating electromagnetic valve, and avoids cracking of a urea box caused by continuous heating of the urea box by engine coolant.
In order to achieve the second object, the present invention provides the following solutions:
an automobile comprising a system for determining mechanical failure of a urea heating solenoid as described in any one of the preceding claims.
Because the automobile disclosed by the invention comprises the system for judging the mechanical failure of the urea heating electromagnetic valve in any one of the above items, the system for judging the mechanical failure of the urea heating electromagnetic valve has the beneficial effects that the automobile disclosed by the invention comprises.
In order to achieve the third object, the present invention provides the following solutions:
a method for judging mechanical failure of a urea heating electromagnetic valve comprises the following steps:
step A: judging whether the temperature of the urea solution in the urea box is greater than or equal to a first preset temperature value or not, whether the temperature rise rate of the urea box is greater than or equal to a first preset calibration value or not, and whether the environmental temperature of the urea box is less than the solution temperature of the urea box or not, if so, turning to the step B;
and B: controlling the heating electromagnetic valve to be switched on and off for a first preset time, and turning to the step C;
and C: judging whether the temperature of the urea solution in the urea box is greater than the first preset temperature value, if so, turning to the step D, and if not, turning to the step A;
step D: and reporting the mechanical failure of the heating electromagnetic valve.
Preferably, in the method for judging the mechanical failure of the urea heating solenoid valve, step D is followed by step E: and controlling an alarm to give an alarm.
According to the technical scheme, the method for judging the mechanical failure of the urea heating electromagnetic valve comprises the steps of firstly judging whether the temperature of a urea solution in a urea box is larger than or equal to a first preset temperature value or not, judging whether the temperature rise rate of the urea box is larger than or equal to a first preset calibration value or not, and judging whether the environmental temperature is smaller than the solution temperature of the urea box or not, and if so, judging that the urea box has an abnormal heating condition. And then, the control device controls the heating electromagnetic valve to be switched on and off for a first preset time, and tries to repair the mechanical fault, and if the temperature of the urea solution in the urea box detected by the urea box temperature sensor is higher than a first preset temperature value, the control device reports that the heating electromagnetic valve is in mechanical failure. The method for judging the mechanical failure of the urea heating electromagnetic valve can judge the mechanical failure of the urea heating electromagnetic valve, and avoids cracking of the urea tank caused by continuous heating of the urea tank by engine coolant.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a system for determining mechanical failure of a urea heating solenoid valve according to the present invention;
FIG. 2 is a flowchart of a method for determining a mechanical failure of a urea heating solenoid according to a fourth embodiment of the present invention;
fig. 3 is a flowchart of a method for determining mechanical failure of a urea heating solenoid valve according to a fifth embodiment of the present invention.
Wherein, in fig. 1-3:
urea case temperature sensor 1, urea case 2, engine 3, circulation pipeline 4, heating solenoid valve 5, ambient temperature sensor 6, controlling means 7.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Example one
As shown in figure 1, the invention discloses a system for judging mechanical failure of a urea heating electromagnetic valve, which comprises a urea box temperature sensor 1, an ambient temperature sensor 6 and a control device 7.
The urea box temperature sensor 1 is arranged in the urea solution of the urea box 2, and can detect the temperature of the urea solution in real time. The engine 3 is provided with a circulating pipeline 4, an inlet of the circulating pipeline 4 is communicated with a cooling liquid outlet of the engine 3, an outlet of the circulating pipeline 4 is communicated with a cooling liquid inlet of the engine 3, the circulating pipeline 4 is immersed in the urea solution of the urea box 2, the circulating pipeline 4 is also provided with a heating electromagnetic valve 5 for controlling the on-off of the circulating pipeline 4, when the heating electromagnetic valve 5 is in a closed state, the circulating pipeline 4 is communicated, and at the moment, the cooling liquid in a water pump of the engine 3 circulates in the circulating pipeline 4 to heat the urea solution in the urea box 2; when the heating solenoid valve 5 is in the open state, the circulation line 4 is disconnected.
The ambient temperature sensor 6 is capable of measuring the ambient temperature outside the urea tank 2. And the urea box temperature sensor 1, the environment temperature sensor 6 and the heating electromagnetic valve 5 are in signal connection with a control device 7.
When the temperature of the urea solution in the urea box 2 is greater than or equal to a first preset temperature value, the temperature rise rate of the urea box 2 is greater than or equal to a first preset calibration value, and the environmental temperature is less than the temperature of the urea solution in the urea box 2, the control device 7 can control the heating solenoid valve 5 to be switched on and off for a first preset time, and when the temperature of the urea solution in the urea box 2 is greater than the first preset temperature value, the control device 7 can report that the heating solenoid valve 5 is mechanically disabled.
The first preset temperature value is the maximum temperature value that the urea solution can reach when the urea tank 2 is normally heated after a plurality of tests of the inventor. The first preset calibration value is the fastest temperature rise rate of the urea solution when the urea box 2 is normally heated. The first preset time can be set according to actual needs, and the urea box 2 electromagnetic valve can be conveniently restarted to repair faults.
Specifically, in the present embodiment, the control device 7 is an engine ECU that is signal-connected to a coolant temperature sensor for detecting the temperature of coolant in the engine 3. The control device 7 may be a separate control device 7.
When the system for judging the mechanical failure of the urea heating electromagnetic valve is used, an environment temperature sensor 6 transmits a detected environment temperature signal outside a urea box 2 and a detected temperature signal of a urea solution in the urea box 2 by a urea box temperature sensor 1 to a control device 7, the control device 7 judges whether the temperature of the urea solution in the urea box 2 is greater than or equal to a first preset temperature value or not, whether the temperature rise rate of the urea box 2 is greater than or equal to a first preset calibration value or not and whether the environment temperature is less than the solution temperature of the urea box 2 or not, and if so, judges that the abnormal heating condition exists in the urea box 2. And then, the control device 7 controls the heating electromagnetic valve 5 to be switched on and off for a first preset time, and tries to repair the mechanical fault, if the temperature of the urea solution in the urea box 2 detected by the urea box temperature sensor 1 is greater than a first preset temperature value, the control device 7 reports that the heating electromagnetic valve 5 is in mechanical failure. Namely, the system for judging the mechanical failure of the urea heating electromagnetic valve can judge the mechanical failure of the urea heating electromagnetic valve 5, and avoids the cracking of the urea box 2 caused by the continuous heating of the urea box 2 by the cooling liquid of the engine 3.
Example two
In a second embodiment provided by the present invention, a system for determining a mechanical failure of a urea heating solenoid valve in this embodiment is similar in structure to the system for determining a mechanical failure of a urea heating solenoid valve in the first embodiment, and details of the same parts are omitted, and only differences are introduced.
In the present embodiment, specifically disclosing the system for determining the mechanical failure of the urea heating solenoid valve, the ambient temperature sensor 6 is installed on the outer side wall of the urea tank 2. Specifically, the ambient temperature sensors 6 may be multiple and evenly distributed on the outer side wall of the urea tank 2, so as to improve the accuracy of the ambient temperature test.
Furthermore, the invention discloses a system for judging the mechanical failure of the urea heating electromagnetic valve, which further comprises an alarm, wherein the alarm is in signal connection with the control device 7, and can be controlled to alarm after the control device 7 reports that the heating electromagnetic valve 5 is in mechanical failure.
After the engine 3 is started, the temperature of the urea solution in the urea tank 2 will rise to some extent due to the rise in the ambient temperature, but this rate of rise and the finally attainable temperature values are taken into account already at the time of design, both the rate and the final temperature values being relatively low. If the temperature rate of the urea solution in the urea tank 2 is high, abnormal heating is caused, and it can be preliminarily determined that the heating solenoid valve 5 is abnormally circulated. Aiming at the situation, the heating electromagnetic valve 5 is switched on and off for a plurality of times to try to repair, the temperature of the solution in the urea box 2 is monitored again after the repair is finished, if the fault is repaired at the moment, the cooling liquid of the engine 3 does not flow any more, the temperature of the solution in the urea box 2 is reduced after a period of time, and the rapid temperature rise is not performed any more; if the temperature of the solution in the urea box 2 continuously rises, the fault is still considered to exist, the fault is reported, and an alarm is used for giving an alarm, so that an operator can find the fault and stop checking as soon as possible.
EXAMPLE III
The invention provides an automobile comprising a system for judging mechanical failure of a urea heating solenoid valve in any one of the embodiments.
Because the automobile disclosed by the invention comprises the system for judging the mechanical failure of the urea heating electromagnetic valve in any one of the embodiments, the system for judging the mechanical failure of the urea heating electromagnetic valve has the beneficial effects that the automobile disclosed by the invention comprises the system for judging the mechanical failure of the urea heating electromagnetic valve.
Example four
Referring to fig. 2, the present invention provides a method for determining a mechanical failure of a urea heating solenoid valve, comprising the steps of:
step S1: and judging whether the temperature of the urea solution in the urea box is greater than or equal to a first preset temperature value, whether the temperature rise rate of the urea box is greater than or equal to a first preset calibration value and whether the environmental temperature of the urea box is less than the solution temperature of the urea box, if so, turning to the step S2.
The first preset temperature value is the maximum temperature value which can be reached by the urea solution of the urea box when the urea box is normally heated after a plurality of tests of the inventor. The first preset calibration value is the fastest temperature rise rate of the urea solution when the urea box is normally heated.
After the engine is started, the temperature of the urea solution in the urea box rises to a certain extent due to the rise of the ambient temperature, but the rising temperature rate and the final achievable temperature value are considered in the design, and the temperature rate and the final temperature value are relatively low. If the temperature rate of the urea solution in the urea box is higher, abnormal heating is achieved, and abnormal circulation of the heating electromagnetic valve can be preliminarily judged.
Step S2: and controlling the heating electromagnetic valve to be switched on and off for a first preset time, and turning to the step S3.
The first preset time can be set according to actual needs, the failure of the electromagnetic valve is convenient to restart and repair, and the heating electromagnetic valve is prevented from being stopped for inspection under the condition of being capable of being repaired by restarting.
Step S3: and judging whether the temperature of the urea solution in the urea box is greater than a first preset temperature value, if so, turning to the step S4, and if not, turning to the step S1.
If the fault is repaired after the heating electromagnetic valve is restarted for multiple times and the cooling liquid is not circulated any more, the temperature of the solution in the urea box is reduced after a period of time and is not rapidly increased; and if the temperature of the solution in the urea box continuously rises, the fault is considered to be still existed, and the fault is reported.
Step S4: and reporting the mechanical failure of the heating electromagnetic valve.
The invention discloses a method for judging mechanical failure of a urea heating electromagnetic valve, which comprises the steps of firstly judging whether the temperature of a urea solution in a urea box is greater than or equal to a first preset temperature value, whether the temperature rise rate of the urea box is greater than or equal to a first preset calibration value and whether the environmental temperature is less than the solution temperature of the urea box, and if so, judging that the urea box has abnormal heating conditions. And then, the control device controls the heating electromagnetic valve to be switched on and off for a first preset time, and tries to repair the mechanical fault, and if the temperature of the urea solution in the urea box detected by the urea box temperature sensor is higher than a first preset temperature value, the control device reports that the heating electromagnetic valve is in mechanical failure. The method for judging the mechanical failure of the urea heating electromagnetic valve can judge the mechanical failure of the urea heating electromagnetic valve, and avoids cracking of the urea tank caused by continuous heating of the urea tank by engine coolant.
EXAMPLE five
As shown in fig. 3, in a fifth embodiment provided by the present invention, a method for determining a mechanical failure of a urea heating solenoid valve in the present embodiment is similar to a method for determining a mechanical failure of a urea heating solenoid valve in the fourth embodiment, and the same parts are not repeated and only differences are introduced.
In this embodiment, the present invention further includes, after step S4, step S5: and controlling an alarm to give an alarm.
The alarm is used for alarming, so that an operator can find and stop checking as soon as possible.
The terms "first", "second", and the like in the present invention are used for descriptive distinction and have no other special meaning.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and inventive features disclosed herein.
Claims (6)
1. A system for judging mechanical failure of a urea heating solenoid valve is characterized by comprising:
the system comprises a urea box temperature sensor (1), wherein the urea box temperature sensor (1) is arranged in a urea solution of a urea box (2), an engine (3) is provided with a circulating pipeline (4), an inlet of the circulating pipeline (4) is communicated with a cooling liquid outlet of the engine (3), an outlet of the circulating pipeline (4) is communicated with a cooling liquid inlet of the engine (3), the circulating pipeline (4) is immersed in the urea solution of the urea box (2), and the circulating pipeline (4) is also provided with a heating electromagnetic valve (5) for controlling the on-off of the circulating pipeline (4);
an ambient temperature sensor (6), the ambient temperature sensor (6) being capable of measuring an ambient temperature outside the urea tank (2);
the control device (7), the urea box temperature sensor (1), the environment temperature sensor (6) and the heating electromagnetic valve (5) are in signal connection with the control device (7);
work as the urea solution temperature of urea case (2) is greater than or equal to first preset temperature value, the temperature rise rate of urea case (2) is greater than or equal to first preset calibration value, just ambient temperature is less than during the solution temperature of urea case (2), controlling means (7) can control heating solenoid valve (5) break-make is first predetermineeing the time, and works as the urea solution temperature of urea case (2) is greater than during the first preset temperature value, controlling means (7) can report heating solenoid valve (5) mechanical failure.
2. System for determining the mechanical failure of a urea heating solenoid valve according to claim 1, characterized in that said ambient temperature sensor (6) is mounted on the external side wall of said urea tank (2).
3. The system for judging the mechanical failure of the urea heating solenoid valve according to claim 1, further comprising an alarm;
the alarm is in signal connection with the control device (7), and when the control device (7) reports that the heating electromagnetic valve (5) is mechanically failed, the alarm can be controlled to give an alarm.
4. A vehicle comprising a system for determining mechanical failure of a urea heating solenoid according to any one of claims 1 to 3.
5. A method for judging mechanical failure of a urea heating electromagnetic valve is characterized by comprising the following steps:
step A: judging whether the temperature of the urea solution in the urea box is greater than or equal to a first preset temperature value or not, whether the temperature rise rate of the urea box is greater than or equal to a first preset calibration value or not, and whether the environmental temperature of the urea box is less than the solution temperature of the urea box or not, if so, turning to the step B;
and B: controlling the heating electromagnetic valve to be switched on and off for a first preset time, and turning to the step C;
and C: judging whether the temperature of the urea solution in the urea box is greater than the first preset temperature value, if so, turning to the step D, and if not, turning to the step A;
step D: and reporting the mechanical failure of the heating electromagnetic valve.
6. The method for judging the mechanical failure of the urea heating solenoid valve as recited in claim 5, further comprising a step E after the step D: and controlling an alarm to give an alarm.
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| CN113700540B (en) * | 2021-09-14 | 2023-01-06 | 潍柴动力股份有限公司 | Method for detecting blockage of heating electromagnetic valve of urea tank and engine |
| CN114607494A (en) * | 2022-03-04 | 2022-06-10 | 潍柴动力股份有限公司 | Method and device for monitoring faults of heating electromagnetic valve of urea box |
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| JP5671840B2 (en) * | 2010-05-17 | 2015-02-18 | いすゞ自動車株式会社 | SCR decompression control system |
| CN101963084B (en) * | 2010-10-29 | 2012-09-05 | 上海交通大学 | Selective catalytic reduction urea air premixing jet system |
| JP2013217233A (en) * | 2012-04-05 | 2013-10-24 | Isuzu Motors Ltd | Method of diagnosing urea water heating valve and device for the same |
| US20160376968A1 (en) * | 2015-06-29 | 2016-12-29 | Caterpillar Inc. | Header unit for reductant tank |
| CN105298606B (en) * | 2015-11-12 | 2018-03-09 | 潍柴动力股份有限公司 | A kind of switch electromagnetic valve fault alarm method and device |
| CN105604663B (en) * | 2015-12-18 | 2018-07-03 | 潍柴动力股份有限公司 | A kind of SCR system coolant solenoid valve failure detection method, detection device |
| CN106762046B (en) * | 2016-11-25 | 2019-09-27 | 潍柴动力股份有限公司 | A kind of urea box heating system and its heating means for vehicle |
| CN106640294B (en) * | 2017-01-23 | 2023-02-03 | 中国第一汽车股份有限公司 | Dual-pressure-sensor type gas-drive urea injection system and control method |
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