CN215633365U - EGR system protection system, engine and vehicle - Google Patents
EGR system protection system, engine and vehicle Download PDFInfo
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- CN215633365U CN215633365U CN202022855483.7U CN202022855483U CN215633365U CN 215633365 U CN215633365 U CN 215633365U CN 202022855483 U CN202022855483 U CN 202022855483U CN 215633365 U CN215633365 U CN 215633365U
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Abstract
The utility model provides an EGR system protection system, an engine and a vehicle, wherein the protection system is used for monitoring the pressure flowing through the water inlet side of an EGR cooler, and timely cutting off an EGR valve when the pressure is detected not to be within a preset range, so that the operation of the EGR system is detected more quickly, the EGR valve is cut off in time, the protection effect on the EGR valve, the EGR cooler, a one-way valve and the like is realized, and the safe and reliable operation of the EGR system is ensured.
Description
Technical Field
The utility model relates to the technical field of automobile control, in particular to an EGR (exhaust gas recirculation) system protection system, an engine and a vehicle.
Background
Under the background of upgrading emission regulations, the engine adopts an EGR route, so that the generation amount of NOx can be reduced, and the original emission level of the engine can be improved. At present, referring to fig. 1, a temperature sensor a after EGR cooling is often installed in the prior art, the operating state of the EGR system is monitored through the temperature sensor a after EGR cooling, and the EGR valve is shut off when the detected temperature is too high, so as to protect the EGR valve, the EGR cooler, the check valve, and the like. However, since the temperature transmission is relatively delayed, the system in which the temperature sensor a is used to cut off the EGR valve after the EGR cooling is detected has a slow response speed, and thus the detection result is delayed, and the system response speed is slow, which tends to cause irreversible damage to the EGR valve, the EGR cooler, and the check valve.
SUMMERY OF THE UTILITY MODEL
In view of this, embodiments of the present invention provide an EGR system protection system and an engine, so as to ensure safe and reliable operation of the EGR system.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
an EGR system protection system comprising:
the water pressure sensor is arranged on the water inlet side of the EGR cooler and used for detecting the water inlet pressure of the EGR cooler;
the first input end of the first comparator is connected with the output end of the water pressure sensor and is used for comparing the water pressure detected by the water pressure sensor with a first target water pressure and outputting a comparison result;
the first input end of the second comparator is connected with the output end of the water pressure sensor and is used for comparing the water pressure detected by the water pressure sensor with a second target water pressure and outputting a comparison result;
the controller is used for generating a control instruction for controlling the EGR valve to be cut off when the comparison result output by the first comparator and used for representing that the water pressure detected by the water pressure sensor is greater than a first target water pressure or the comparison result output by the second comparator and used for representing that the water pressure detected by the water pressure sensor is less than a second target water pressure is obtained.
Optionally, the EGR system protection system further includes:
the first storage stores a first target water pressure and a second target water pressure which are matched with the rotating speed and the load of the engine.
Optionally, the EGR system protection system further includes:
an EGR cooled temperature sensor;
a first input end of the third comparator is connected with an output end of the EGR cooled temperature sensor and is used for comparing the water temperature detected by the EGR cooled temperature sensor with a first target water temperature and outputting a comparison result;
a first input end of the fourth comparator is connected with the output end of the EGR cooled temperature sensor and is used for comparing the water temperature detected by the EGR cooled temperature sensor with a second target water temperature and outputting a comparison result;
the input end of the controller is further connected with the output ends of the third comparator and the fourth comparator, and the controller is further used for generating a control instruction for controlling the EGR valve to be switched off when a comparison result output by the second comparator and used for representing that the water temperature detected by the EGR cold temperature sensor is larger than a first target water temperature is obtained, or when a comparison result output by the second comparator and used for representing that the water temperature detected by the EGR cold temperature sensor is smaller than a second target water temperature is obtained.
Optionally, the EGR system protection system further includes:
and a second memory in which a first target water temperature and a second target water temperature that match an engine speed and a load are stored. 5. The EGR system protection system of claim 1 wherein said controller is integrated into a vehicle ECU.
Optionally, in the EGR system protection system, the controller is further configured to generate an alarm signal while generating a control command for controlling the EGR valve to be turned off;
in the EGR system protection system, the EGR system protection system further includes:
and the alarm is used for responding to the alarm signal.
Optionally, in the EGR system protection system, the alarm is an indicator light on an instrument panel of the vehicle.
An engine, wherein the EGR system protection system is applied to any one of the EGR systems.
Optionally, the engine is a diesel engine.
A vehicle to which the engine of any one of the above is applied.
Based on the technical scheme, the scheme provided by the embodiment of the utility model can realize the rapid detection of the operation of the EGR system by monitoring the pressure flowing through the water inlet side of the EGR cooler and timely cutting off the EGR valve when the pressure is not detected to be within the preset range, so that the EGR valve, the EGR cooler, the one-way valve and the like are protected, and the safe and reliable operation of the EGR system is ensured.
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 embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic block diagram of a prior art engine system;
FIG. 2 is a schematic structural diagram of an EGR system protection system provided by an embodiment of the present application;
FIG. 3 is a schematic structural diagram of an EGR system protection system according to an exemplary embodiment of the present disclosure;
FIG. 4 is a schematic block diagram of an engine system according to an exemplary embodiment of the present application;
fig. 5 is a schematic structural diagram of an EGR system protection system according to another embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In view of the problems of the prior art, that the mode of detecting the operating state of the EGR system by the temperature detection mode has high delay and low reliability, the present application discloses a protection system for the EGR system, and referring to fig. 2, the system may include: a water pressure sensor 100, a pressure determination module 200, and a controller 300.
A water pressure sensor 100, referring to fig. 4, the water pressure sensor 100 is disposed on a water inlet side of the EGR cooler and is configured to detect a water inlet pressure of the EGR cooler, in this embodiment, since a water pressure at a water intake end of the EGR cooler changes at a first time when an operating state of the EGR system changes, the operating state of the EGR system can be known in time by detecting the water pressure at the water intake end of the EGR cooler;
a pressure determining module 200, configured to determine whether the water pressure detected by the water pressure sensor 100 falls within a preset pressure range, and output a first comparison result when the water pressure falls within the preset pressure range, or output a second comparison result when the water pressure does not fall within the preset pressure range, where the preset pressure range is a closed interval formed by a first target water pressure and a second target water pressure, and the first target water pressure is greater than the second target water pressure;
in this embodiment, referring to fig. 3, the pressure determining module 200 may be composed of a first comparator 201 and a second comparator 202;
a first input end of the first comparator 201 is connected to an output end of the water pressure sensor 100, and is configured to compare the water pressure detected by the water pressure sensor 100 with a first target water pressure, and output a comparison result; in a normal state, if the EGR system works normally, the water pressure of the water taking end of the EGR cooler is controlled within a certain range, the water pressure of the water taking end of the EGR cooler cannot exceed a first target water pressure, and when the EGR system is in some abnormal states, the water pressure of the water taking end of the EGR cooler can be rapidly increased, so that the working state of the EGR system can be determined by comparing a detected pressure signal output by the water pressure sensor 100 with a preset first target water pressure, and when the pressure signal output by the water pressure sensor 100 is greater than the preset first target water pressure, the comparator outputs a first level signal which is used for indicating that the EGR system works abnormally;
a first input end of the second comparator 202 is connected to an output end of the water pressure sensor 100, and is configured to compare the water pressure detected by the water pressure sensor 100 with a second target water pressure, and output a comparison result; under normal conditions, if the EGR system works normally, the water pressure of the water pressure at the water taking end of the EGR cooler can be controlled within a certain range, the water pressure of the water pressure is not smaller than the second target water pressure, when the EGR system is in certain abnormal conditions, the water pressure of the water pressure at the water taking end of the EGR cooler can be rapidly reduced, therefore, the working state of the EGR system can be determined by comparing the detected pressure signal output by the water pressure sensor 100 with the preset second target water pressure, and when the pressure signal output by the water pressure sensor 100 is smaller than the preset second target water pressure, the second comparator 202 outputs a first level signal which is used for indicating that the EGR system works abnormally.
In the above scheme, the first level signals output by the first comparator 201 and the second comparator 202 may be output as the first comparison result of the pressure determination module 200;
the controller 300, an input end of the comparator is connected with an output end of the pressure judging module 200, and the controller 300 is configured to generate a control instruction for controlling the EGR valve to be switched off when a first comparison result output by the pressure judging module 200 is obtained;
specifically, the input end of the controller 300 is connected to the output ends of the first comparator 201 and the second comparator 202, and the controller 300 is configured to generate a control command for controlling the EGR valve to be turned off when the first level signal of the first comparator 201 or the second comparator 202 is obtained. In this embodiment, the controller 300 is configured to control an on/off state of the EGR valve based on a comparison result of the first comparator 201 and the second comparator 202, the on/off state of the EGR valve determines an operation state of the EGR system, the EGR system enters an off state when the EGR valve is turned off, and the EGR system enters an operating state when the EGR valve is turned on. In this embodiment, when the controller 300 obtains a first level signal output by the first comparator 201 or the second comparator 202, a control instruction is generated, the control instruction is used to control the EGR valve to be turned off, and the first level signal is used to indicate that the water pressure detected by the water pressure sensor 100 is greater than a first target water pressure or that the water pressure detected by the water pressure sensor 100 is less than a second target water pressure.
In this scheme, through the pressure of the EGR cooler side of intaking of control flow through, in time cut off the EGR valve when detecting pressure and not within the within range of predetermineeing, realize the detection that the operation is faster to the EGR system, in time cut off the EGR valve, realize the guard action to EGR valve, EGR cooler, check valve etc..
In the technical solution disclosed in the embodiment of the present application, the engine system using the EGR system protection system has different working conditions, and the specific values of the first target water pressure and the second target water pressure are different, in the present application, a mapping table between the working conditions (engine speed and load) of the engine system and the first target water pressure and the second target water pressure may be pre-established, and the mapping table is stored in a first memory, at this time, the first memory may store the first target water pressure and the second target water pressure matched with the engine speed and the load, and the first comparator 201 and the second comparator 202 may directly retrieve the first target water pressure and the second target water pressure corresponding to the current engine working condition.
In another embodiment of the present application, in order to further ensure the safety of the EGR system, the above scheme may still retain a control scheme for controlling the EGR system through an EGR-cooled temperature sensor, that is, in the EGR system protection system described above with reference to fig. 1 and 5, the control scheme may further include:
EGR cooled temperature sensor A;
a third comparator 401, a first input end of the third comparator 401 is connected to an output end of the EGR-cooled temperature sensor, and is configured to compare the water temperature detected by the EGR-cooled temperature sensor with a first target water temperature, and output a comparison result;
a fourth comparator 402, a first input end of the fourth comparator 402 is connected to an output end of the EGR-cooled temperature sensor, and is configured to compare the water temperature detected by the EGR-cooled temperature sensor with a second target water temperature, and output a comparison result, where the second target water temperature is less than the first target water temperature;
the input end of the controller 300 is further connected to the output ends of the third comparator 401 and the fourth comparator 402, and the controller 300 is further configured to generate a control instruction for controlling the EGR valve to shut off when a comparison result output by the second comparator 202 and used for indicating that the water temperature detected by the EGR-cooled temperature sensor is greater than a first target water temperature is obtained, or when a comparison result output by the second comparator 202 and used for indicating that the water temperature detected by the EGR-cooled temperature sensor is less than a second target water temperature is obtained.
Similar to the function of the first storage, the present embodiment may further include a second storage, in which a first target water temperature and a second target water temperature that match the engine speed and the load are stored. The first target water temperature and the second target water temperature can be adjusted according to design requirements.
In the technical solutions disclosed in the above embodiments of the present application, the controller may be an independent processing chip, and may also be integrated in the vehicle ECU.
In order to facilitate prompting to a user when the EGR valve is controlled to be cut off, in the scheme, the controller is also used for generating a control instruction for controlling the EGR valve to be cut off and generating an alarm signal at the same time; the device also comprises an alarm which is used for responding to the alarm signal. Which may be an indicator light on the dashboard of the vehicle.
Corresponding to the system protection system, the application also discloses an EDR system and an engine using the system, the EGR system and the engine can be applied with the EGR system protection system of any one of the embodiments, and the engine can be a diesel engine.
Corresponding to the engine, the application also discloses a vehicle, and the vehicle is applied with the engine in any item of the application.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
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 utility model. 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 novel features disclosed herein.
Claims (10)
1. An EGR system protection system, comprising:
the water pressure sensor is arranged on the water inlet side of the EGR cooler and used for detecting the water inlet pressure of the EGR cooler;
the first input end of the first comparator is connected with the output end of the water pressure sensor and is used for comparing the water pressure detected by the water pressure sensor with a first target water pressure and outputting a comparison result;
the first input end of the second comparator is connected with the output end of the water pressure sensor and is used for comparing the water pressure detected by the water pressure sensor with a second target water pressure and outputting a comparison result;
the controller is used for generating a control instruction for controlling the EGR valve to be cut off when the comparison result output by the first comparator and used for representing that the water pressure detected by the water pressure sensor is greater than a first target water pressure or the comparison result output by the second comparator and used for representing that the water pressure detected by the water pressure sensor is less than a second target water pressure is obtained.
2. The EGR system protection system of claim 1 further comprising:
the first storage stores a first target water pressure and a second target water pressure which are matched with the rotating speed and the load of the engine.
3. The EGR system protection system of claim 1 further comprising:
an EGR cooled temperature sensor;
a first input end of the third comparator is connected with an output end of the EGR cooled temperature sensor and is used for comparing the water temperature detected by the EGR cooled temperature sensor with a first target water temperature and outputting a comparison result;
a first input end of the fourth comparator is connected with the output end of the EGR cooled temperature sensor and is used for comparing the water temperature detected by the EGR cooled temperature sensor with a second target water temperature and outputting a comparison result;
the input end of the controller is further connected with the output ends of the third comparator and the fourth comparator, and the controller is further used for generating a control instruction for controlling the EGR valve to be switched off when a comparison result output by the second comparator and used for representing that the water temperature detected by the EGR cold temperature sensor is larger than a first target water temperature is obtained, or when a comparison result output by the second comparator and used for representing that the water temperature detected by the EGR cold temperature sensor is smaller than a second target water temperature is obtained.
4. The EGR system protection system of claim 3, further comprising:
and a second memory in which a first target water temperature and a second target water temperature that match an engine speed and a load are stored.
5. The EGR system protection system of claim 1 wherein said controller is integrated into a vehicle ECU.
6. The EGR system protection system of claim 1,
the controller is also used for generating an alarm signal while generating a control instruction for controlling the EGR valve to be switched off;
further comprising:
and the alarm is used for responding to the alarm signal.
7. The EGR system protection system of claim 6, wherein the alarm is an indicator light on a vehicle dashboard.
8. An engine, characterized in that an EGR system protection system according to any one of claims 1-7 is applied.
9. The engine of claim 8, wherein the engine is a diesel engine.
10. A vehicle, characterized in that an engine according to any one of claims 8-9 is applied.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022855483.7U CN215633365U (en) | 2020-12-01 | 2020-12-01 | EGR system protection system, engine and vehicle |
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| CN202022855483.7U CN215633365U (en) | 2020-12-01 | 2020-12-01 | EGR system protection system, engine and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117418971A (en) * | 2023-12-19 | 2024-01-19 | 潍柴动力股份有限公司 | EGR cooler, control method thereof and engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117418971A (en) * | 2023-12-19 | 2024-01-19 | 潍柴动力股份有限公司 | EGR cooler, control method thereof and engine |
| CN117418971B (en) * | 2023-12-19 | 2024-04-16 | 潍柴动力股份有限公司 | EGR cooler, control method thereof and engine |
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