阅读说明：本技术 一种防止水泵空转损坏的方法及装置 (Method and device for preventing idle damage of water pump ) 是由 尹晓青 陈有兵 于 2021-10-29 设计创作，主要内容包括：本发明公开了一种防止水泵空转损坏的方法及装置,方法包括当检测到水泵的内部无水时,发动机ECU中的无水次数n累加1次,同时开始计时；当无水次数n＜设定次数N且计时时间t＜预设时间T时,发动机正常运行或起动；否则,继断当前发动机是否处于越控状态；若是,则不对正常运行的发动机进行扭矩限制、也不对起动状态下的发动机进行起动限制,仅报水泵故障；若否,则对正常运行的发动机进行扭矩限制、对起动状态下的发动机进行起动限制,同时报水泵故障。当出现水泵故障时,本发明可及时提醒用户并在非越控状态下及时进行扭矩限制或起动限制,有效避免水泵因长时间无水高速空转而产生损坏的问题,延长了水泵的使用寿命。(The invention discloses a method and a device for preventing idle damage of a water pump, wherein the method comprises the steps of accumulating the anhydrous times n in an engine ECU for 1 time when no water is detected in the water pump, and starting timing; when the anhydrous times N are less than the set times N and the timing time T is less than the preset time T, the engine normally runs or starts; otherwise, continuously cutting off whether the current engine is in an override state; if yes, torque limitation is not carried out on the engine which normally runs, the engine in the starting state is not limited in starting, and only water pump faults are reported; if not, the torque of the engine which normally runs is limited, the engine in the starting state is limited in starting, and meanwhile, the fault of the water pump is reported. When the water pump has a fault, the invention can remind a user in time and carry out torque limitation or starting limitation in time under a non-override state, effectively avoids the problem that the water pump is damaged due to long-time no-water high-speed idling, and prolongs the service life of the water pump.)

1. A method for preventing a water pump from being damaged by idling is characterized in that a water level detection piece for detecting whether water exists is arranged inside the water pump, and the water level detection piece is electrically connected with an engine ECU; the method comprises the following steps:

s1, when the water level detection piece detects that the interior of the water pump is anhydrous, accumulating the anhydrous times n stored in the engine ECU for 1 time, and starting timing;

s2, when the anhydrous times N are smaller than the set times N and the timing time T is smaller than the preset time T, the engine runs normally or starts normally; if not, continuously judging whether the engine is in an override state at present; executing step S3 if the engine is in an override state, and executing step S4 if the engine is in a non-override state;

s3, carrying out torque limitation on the engine which normally runs and starting limitation on the engine in a starting state, and reporting the fault of the water pump;

and S4, carrying out torque limitation on the normally operated engine, carrying out starting limitation on the engine in a starting state, and reporting a fault of a water pump.

2. The method for preventing idle damage of a water pump according to claim 1, wherein the water pump faults include a water pump no-water fault and a water-free times overrun fault.

3. The method for preventing the water pump from being damaged by idling as claimed in claim 2, wherein when the timing time T is greater than or equal to the preset time T, the water pump is reported to have no water fault; when the anhydrous times N are more than or equal to the set times N, reporting the anhydrous times overrun fault; and when the timing time T is greater than or equal to the preset time T and the water-free frequency N is greater than or equal to the set frequency N, reporting the water pump water-free fault and the water-free frequency overrun fault at the same time.

4. The method for preventing idle damage of a water pump according to claim 2, further comprising, after a water pump failure occurs:

a. judging whether water is detected in the water pump in all the i continuous driving cycles, if so, changing the existing water-free fault of the water pump into a historical fault, and executing the step b; otherwise, the existing water pump no-water fault still exists, torque limitation and starting limitation existing in a non-override state are not solved, wherein i is a natural number;

b. judging whether the water pump faults have the water-free times overrun faults or not, and if the water pump faults exist, not solving the torque limitation and the starting limitation which exist in the non-override state; if not, the torque limitation and the starting limitation existing in the non-override state are released.

5. The method of claim 4, wherein i is equal to 2.

6. The method of preventing pump idle damage of claim 2, further comprising: after the water pump fault occurs, fault repair is carried out manually to eliminate the fault, the torque limit and the starting limit are removed, and the water-free times n are cleared.

7. The method for preventing the idle damage of the water pump according to claim 1, wherein the step S3 specifically comprises:

s31, judging whether the engine is in a normal running state or an un-started state at present, and if the engine is in the normal running state, not limiting the torque of the engine in normal running; if the state is not started, go to step S32;

s32, when a starting request exists, the water pump is started normally and faults are reported; when no starting request is made, the water pump is not started and faults are reported.

8. The method for preventing the idle damage of the water pump according to claim 1, wherein the step S4 specifically comprises:

s41, judging whether the engine is in a normal running state or an un-started state at present, and if the engine is in the normal running state, performing torque limitation on the engine which runs normally; if the state is not started, go to step S42;

s42, when a starting request exists, starting is forbidden and the fault of the water pump is reported; when no starting request is made, the water pump is not started and faults are reported.

9. The device for preventing the water pump from being damaged by idling is characterized by comprising a water pump and a water level detection piece arranged in the water pump, wherein the water level detection piece is electrically connected with an engine ECU (electronic control Unit); the engine ECU includes:

the receiving unit is used for receiving data fed back by the water level detection piece;

the storage counting unit is used for storing the anhydrous times n and performing accumulation calculation on the anhydrous times n when the fact that the interior of the water pump is anhydrous is detected;

the timing unit is used for starting to record the anhydrous time when detecting that the interior of the water pump is anhydrous;

the judging unit is used for judging the water pump fault and judging the override state, the normal running state and the starting state of the engine;

and the sending unit is used for sending corresponding torque limit and starting limit instructions according to the state of the engine.

10. The apparatus for preventing idling damage of water pump of claim 9, wherein said engine ECU further includes a malfunction change unit;

and after the water pump fault occurs, when water is detected in the water pump in the continuous i driving cycles, the fault changing unit is used for changing the water pump water-free fault existing in the water pump fault into a historical fault.

Technical Field

The invention belongs to the technical field of engines, and particularly relates to a method and a device for preventing a water pump from idle running damage.

Background

The ship external circulating water pump is an open type circulating pump, and river water and seawater are pumped into a heat exchanger of the engine to cool internal circulating water and a intercooler; when the water level height was crossed lowly or when not having water in the water pump, the water pump idling phenomenon appears easily and takes place, and the water pump of idle running damages because of unable cooling, seriously shortens the life of water pump, and long-time idle running then can directly lead to the water pump to scrap. At present, a water pump of an engine is not provided with a device for detecting water level, and a corresponding control strategy for preventing the water pump from idling and damaging is not provided.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and the technical problem to be solved by the invention is to provide the method and the device for preventing the water pump from being damaged by idling, so that the problem that the water pump is damaged due to long-time no-water high-speed idling can be effectively solved, and the service life of the water pump is prolonged.

In order to solve the technical problem, the embodiment of the invention provides a method for preventing the water pump from idle running damage, wherein a water level detection piece for detecting whether water exists is arranged in the water pump, and the water level detection piece is electrically connected with an engine ECU (electronic control unit); the method comprises the following steps:

s1, when the water level detection piece detects that the interior of the water pump is anhydrous, accumulating the anhydrous times n stored in the engine ECU for 1 time, and starting timing;

s2, when the anhydrous times N are smaller than the set times N and the timing time T is smaller than the preset time T, the engine runs normally or starts normally; if not, continuously judging whether the engine is in an override state at present; executing step S3 if the engine is in an override state, and executing step S4 if the engine is in a non-override state;

s3, carrying out torque limitation on the engine which normally runs and starting limitation on the engine in a starting state, and reporting the fault of the water pump;

and S4, carrying out torque limitation on the normally operated engine, carrying out starting limitation on the engine in a starting state, and reporting a fault of a water pump.

Further, the water pump faults comprise water pump anhydrous faults and anhydrous times overrun faults.

Further, when the timing time T is greater than or equal to the preset time T, reporting that the water pump has no water fault; when the anhydrous times N are more than or equal to the set times N, reporting the anhydrous times overrun fault; and when the timing time T is greater than or equal to the preset time T and the water-free frequency N is greater than or equal to the set frequency N, reporting the water pump water-free fault and the water-free frequency overrun fault at the same time.

Further, the method also comprises the following steps executed after the water pump fails:

a. judging whether water is detected in the water pump in all the i continuous driving cycles, if so, changing the existing water-free fault of the water pump into a historical fault, and executing the step b; otherwise, the existing water pump no-water fault still exists, torque limitation and starting limitation existing in a non-override state are not solved, wherein i is a natural number;

b. judging whether the water pump faults have the water-free times overrun faults or not, and if the water pump faults exist, not solving the torque limitation and the starting limitation which exist in the non-override state; if not, the torque limitation and the starting limitation existing in the non-override state are released.

Further, i is equal to 2.

Further, the method further comprises: after the water pump fault occurs, fault repair is carried out manually to clear the fault, the torque limit and the starting limit existing in the non-override state are removed, and the water-free times n are cleared.

Further, step S3 specifically includes:

s31, judging whether the engine is in a normal running state or an un-started state at present, and if the engine is in the normal running state, not limiting the torque of the engine in normal running; if the state is not started, go to step S32;

s32, when a starting request exists, the water pump is started normally and faults are reported; when no starting request is made, the water pump is not started and faults are reported.

Further, step S4 specifically includes:

s41, judging whether the engine is in a normal running state or an un-started state at present, and if the engine is in the normal running state, performing torque limitation on the engine which runs normally; if the state is not started, go to step S42;

s42, when a starting request exists, starting is forbidden and the fault of the water pump is reported; when no starting request is made, the water pump is not started and faults are reported.

The embodiment of the invention also provides a device for preventing the water pump from idle running damage, which comprises the water pump and a water level detection piece arranged in the water pump, wherein the water level detection piece is electrically connected with the ECU of the engine; the engine ECU includes:

the receiving unit is used for receiving data fed back by the water level detection piece;

the storage counting unit is used for storing the anhydrous times n and performing accumulation calculation on the anhydrous times n when the fact that the interior of the water pump is anhydrous is detected;

the timing unit is used for starting to record the anhydrous time when detecting that the interior of the water pump is anhydrous;

the judging unit is used for judging the water pump fault and judging the override state, the normal running state and the starting state of the engine;

and the sending unit is used for sending corresponding torque limit and starting limit instructions according to the state of the engine.

Further, the engine ECU further includes a failure change unit;

and after the water pump fault occurs, when water is detected in the water pump in continuous i driving cycles, the fault changing unit is used for changing the water pump water-free fault existing in the water pump fault into a historical fault.

Due to the adoption of the technical scheme, the invention has the following beneficial effects:

the method for preventing the water pump from idle running damage comprises the following steps: s1, when the water level detection piece detects that the interior of the water pump is anhydrous, accumulating the anhydrous times n stored in the engine ECU for 1 time, and starting timing; s2, when the anhydrous times N are smaller than the set times N and the timing time T is smaller than the preset time T, the engine runs normally or starts normally; otherwise, continuously judging whether the current engine is in an override state; if the engine is in an override state, torque limitation is not performed on the engine which normally runs, the engine in a starting state is not limited in starting, and only water pump faults are reported; if the engine is in a non-override state, the torque of the engine in normal operation is limited, the engine in a starting state is limited in starting, and meanwhile, the fault of the water pump is reported.

When the water pump has a fault, the water pump can remind a user in time and carry out torque limitation or starting limitation in time in a non-override state, the problem that the water pump is damaged due to long-time no-water high-speed idling is effectively solved, and the service life of the water pump is prolonged.

Drawings

FIG. 1 is a flow chart of the water pump fault determination step in the method of the present invention;

FIG. 2 is a flow chart of steps performed after a fault occurs in the method;

fig. 3 is a schematic block diagram of the apparatus of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 and 2 together, the present embodiment discloses a method for preventing idle damage of a water pump, wherein a water level detection member for detecting whether water exists is arranged in advance in the water pump, and the water level detection member is electrically connected with an engine ECU; the method comprises the following steps:

and S1, when the water level detection piece detects that the interior of the water pump is anhydrous, accumulating the anhydrous times n stored in the engine ECU for 1 time, and starting timing.

S2, when the anhydrous times N are less than the set times N and the timing time T is less than the preset time T, the engine normally runs or is normally started (timing zero clearing); otherwise, continuously judging whether the current engine is in an override state (simultaneously resetting the timing); if the engine is in the override state, step S3 is executed, and if the engine is not in the override state, step S4 is executed.

And S3, the engine in the normal operation state is not limited in torque, the engine in the starting state is not limited in starting, and only the fault of the water pump is reported.

And S4, carrying out torque limitation on the normally running engine (namely, reducing the speed of the water pump by reducing the speed of the engine, reducing damage caused by high-speed idling of the water pump), carrying out starting limitation on the engine in a starting state, and reporting the fault of the water pump.

In this embodiment, the water pump fault includes a water pump no-water fault and a no-water times overrun fault. When the timing time T is greater than or equal to the preset time T, reporting that the water pump has no water fault; when the anhydrous times N are more than or equal to the set times N, reporting an anhydrous times overrun fault; and when the timing time T is greater than or equal to the preset time T and the water-free number N is greater than or equal to the set number N, reporting the water-free fault and the water-free number overrun fault of the water pump. Where N and T are variables and N and T are constants.

Wherein, step S3 specifically includes:

s31, judging whether the current engine is in a normal running state or an un-started state, and if the current engine is in the normal running state, not limiting the torque of the engine in normal running; if the state is not activated, step S32 is executed.

S32, when a starting request exists, the water pump is started normally and faults are reported; when no starting request is made, the water pump is not started and faults are reported.

Wherein, step S4 specifically includes:

s41, judging whether the current engine is in a normal running state or an un-started state, and if the current engine is in the normal running state, carrying out torque limitation on the normally running engine; if the state is not activated, step S42 is executed.

S42, when a starting request exists, starting is forbidden and the fault of the water pump is reported; when no starting request is made, the water pump is not started and faults are reported.

In this embodiment, the method further includes a step a executed after the water pump failure occurs, and specifically includes:

a. judging whether water is in the water pump detected in all the i continuous driving cycles, if so, changing the existing water pump water-free fault into a historical fault (default automatic repair or artificial repair, temporary elimination of the existing water pump water-free fault, if not, directly skipping), and executing the step b; otherwise, the existing water pump no-water fault still exists, and the torque limit and the starting limit existing in the non-override state are not known, wherein i is a natural number, and preferably, i is equal to 2 in the embodiment.

b. Judging whether the water pump faults have the water-free frequency overrun faults or not, and if so, not solving the torque limitation and the starting limitation which exist in the non-override state; if not, the torque limitation and the starting limitation existing in the non-override state are released. In short, only when the water pump no-water fault becomes a history fault and there is no-water number overrun fault, the torque limit and the start limit existing in the non-override state are allowed to be released; otherwise, the torque limit and the start limit existing in the non-overriding state are not allowed to be released.

When the water pump fault occurs, the fault can be manually and directly repaired to remove the fault, remove the torque limitation and the starting limitation, and clear the water-free times n, and at the moment, the step A is not executed (executed when the fault is not manually repaired).

Based on the method for preventing the water pump from idle damage provided by the embodiment, the embodiment of the invention also provides a device for executing the method for preventing the water pump from idle damage, which specifically comprises the following steps: the water pump and a water level detection piece arranged in the water pump are electrically connected with the engine ECU; wherein the engine ECU includes:

and the receiving unit is used for receiving the data fed back by the water level detection piece.

And the storage counting unit is used for storing the anhydrous times n and performing accumulation calculation on the anhydrous times n when the water is detected to be anhydrous in the water pump.

And the timing unit is used for starting to record the anhydrous time when detecting that the interior of the pump is anhydrous. ,

and the judging unit is used for judging the water pump fault and judging the override state, the normal running state and the starting state of the engine.

And the sending unit is used for sending corresponding torque limit and starting limit instructions according to the state of the engine.

A failure change unit; and after the water pump fault occurs, when water is detected in the water pump in the continuous i driving cycles, the fault changing unit is used for changing the water pump water-free fault existing in the water pump fault into a historical fault.

The device disclosed in the embodiment corresponds to the method disclosed in the embodiment, so that the description is relatively simple, and the relevant points can be referred to the description of the method part.

In conclusion, when the water pump has a fault, the water pump can remind a user in time, and can carry out torque limitation or starting limitation in time in a non-override state, so that the problem that the water pump is damaged due to long-time waterless high-speed idling is effectively solved, and the service life of the water pump is prolonged.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.