CN109611189B - Control system and method of diesel engine - Google Patents
Control system and method of diesel engine Download PDFInfo
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- CN109611189B CN109611189B CN201811440111.9A CN201811440111A CN109611189B CN 109611189 B CN109611189 B CN 109611189B CN 201811440111 A CN201811440111 A CN 201811440111A CN 109611189 B CN109611189 B CN 109611189B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
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Abstract
The application discloses a control system of a diesel engine, which comprises a first comparator, a second comparator, a third comparator, a AND logic gate, a NOT logic gate, a delayer, a first selector, a second selector, a fourth comparator and an electronic control unit, wherein the first comparator and the second comparator are used for judging the water temperature, the first limit value and the second limit value, the third comparator is used for judging the water temperature change slope and the water temperature change slope limit value, different torque selections can be provided for different temperature and temperature change conditions through the AND logic gate, the NOT logic gate, the delayer, the first selector and the second selector, a smaller value is selected based on the fourth comparator and is input to the electronic control unit, the electronic control unit can realize the control of the torque of the diesel engine based on the water temperature and the water temperature change slope, and therefore, the dynamic property of the diesel engine can be guaranteed, but also can ensure that the diesel engine is prevented from being damaged by overhigh water temperature. The application also discloses a control method.
Description
Technical Field
The application relates to the field of control, in particular to a control system and method of a diesel engine.
Background
Diesel engines, i.e., diesel engines, are widely used in heavy vehicles and household vehicles due to their high power and high thermal efficiency. However, when the water temperature of the diesel engine is too high, the engine oil cannot be cooled, and then the cylinder cover, the piston, the bearing bush and other parts of the diesel engine are over-heated locally, and cylinder pulling and bearing bush melting can be caused in severe cases.
In order to protect the diesel engine, an overheating protection strategy based on water temperature is generally arranged in the current electrically controlled diesel engine. Specifically, the water temperature of the diesel engine is monitored, when the water temperature of the diesel engine rises to a certain degree, the diesel engine is immediately executed to limit the torque, the higher the temperature is, the larger the limit torque is, and therefore the working condition that the power is insufficient when the environment temperature of the whole vehicle is higher is easily generated.
Disclosure of Invention
In view of this, the application provides a control system of a diesel engine, can realize controlling the moment of torsion of diesel engine based on water temperature and water temperature slope of change based on this control system, avoid the condition that the moment of torsion of diesel engine is limited promptly to the temperature rise, so, can ensure the dynamic property of diesel engine, can guarantee again that the diesel engine avoids the too high harm of water temperature. Correspondingly, the application also provides a control method of the diesel engine.
A first aspect of the present application provides a control system of a diesel engine, the control system including a first comparator, a second comparator, a third comparator, an and logic gate, a not logic gate, a delayer, a first selector, a second selector, a fourth comparator, and an electronic control unit;
the first comparator is used for comparing the water temperature of the diesel engine with a first limit value, the second comparator is used for comparing the water temperature of the diesel engine with a second limit value, the third comparator is used for comparing the water temperature change slope of the diesel engine with a water temperature change slope limit value, and the comparison results of the first comparator, the second comparator and the third comparator are input into the AND logic gate;
the output result of the and logic gate is respectively input to the delayer and the not logic gate, the output result of the not logic gate is input to the first selector and is used for controlling the first selector to output the maximum torque of the diesel engine or the overheat protection torque of the diesel engine, the delayer is used for determining whether to perform overheat protection delay according to the output result of the and logic gate, and the output result of the delayer is input to the second selector and is used for controlling the second selector to output the maximum torque of the diesel engine or the overheat protection torque of the diesel engine;
the output results of the first selector and the second selector are input to a fourth comparator, the fourth comparator is used for outputting the smaller value of the output results of the first selector and the second selector, and the output result of the fourth comparator is input to the electronic control unit, so that the electronic control unit controls the torque of the diesel engine according to the output result of the fourth comparator.
Optionally, the delay is specifically configured to:
and if the output result of the AND logic gate is changed from 0 to 1, starting a delay function by the delay unit, and determining to carry out overheat protection delay.
Optionally, the first selector is specifically configured to:
and when the output result of the NOT logic gate is changed from 0 to 1, outputting the overheat protection torque of the diesel engine, otherwise, outputting the maximum torque of the diesel engine.
Optionally, the second selector is specifically configured to:
if the time delayer is started for delaying time, outputting the maximum torque of the diesel engine during the delay time, and outputting the overheat protection torque of the diesel engine during the non-delay time;
and if the delayer is not started for delaying, outputting the maximum torque of the diesel engine.
Optionally, the first comparator is specifically configured to compare whether the water temperature of the diesel engine is greater than or equal to a first limit value, and if so, output a result of 1;
the second comparator is specifically used for comparing whether the water temperature of the diesel engine is smaller than or equal to a second limit value, and if so, the output result is 1;
the third comparator is specifically used for comparing whether the water temperature change slope of the diesel engine is smaller than or equal to the water temperature change slope limit value, and if yes, the output result is 1.
Optionally, the electronic control unit is specifically configured to:
and adjusting the output torque of the diesel engine according to the output result of the fourth comparator and the torque change rate.
A second aspect of the present application provides a control method for a diesel engine, which is applied to the control system for a diesel engine according to the first aspect of the present application, and the method includes:
acquiring the water temperature and the water temperature change slope of the diesel engine;
and controlling the output torque of the diesel engine according to the water temperature and the water temperature change slope.
Optionally, the controlling the output torque of the diesel engine according to the water temperature and the water temperature change slope includes:
and if the water temperature of the diesel engine is greater than or equal to a first limit value and less than or equal to a second limit value, and the water temperature change slope of the diesel engine is less than or equal to the water temperature change slope limit value, performing overheat delay protection on the diesel engine, outputting the maximum torque during delay, and outputting overheat protection torque during non-delay.
Optionally, the controlling the output torque of the diesel engine according to the water temperature and the water temperature change slope includes:
and if the water temperature of the diesel engine is smaller than a first limit value, the water temperature of the diesel engine is larger than a second limit value and/or the water temperature change slope of the diesel engine is larger than the water temperature change slope limit value, controlling the diesel engine to output overheating protection torque.
Optionally, the overheat protection torque is determined according to a water temperature of the diesel engine.
According to the technical scheme, the embodiment of the application has the following advantages:
the embodiment of the application provides a control system of a diesel engine, which comprises a first comparator, a second comparator, a third comparator, an AND logic gate, a NOT logic gate, a delayer, a first selector, a second selector, a fourth comparator and an electronic control unit, wherein the first comparator and the second comparator are used for judging the water temperature, a first limit value and a second limit value, the third comparator is used for judging the water temperature change slope and the water temperature change slope limit value, different torque selections can be provided for different temperature and temperature change conditions through the AND logic gate, the NOT logic gate, the delayer, the first selector and the second selector, the smaller value is selected based on the fourth comparator and is input to the electronic control unit, so that the electronic control unit can realize the control of the torque of the diesel engine based on the water temperature and the water temperature change slope, therefore, the dynamic property of the diesel engine can be guaranteed, and the diesel engine can be prevented from being damaged by overhigh water temperature.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a control system of a diesel engine according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a control method of a diesel engine according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The application provides a control system of a diesel engine, because the short-time rising of water temperature can not influence the reliability of the diesel engine, consequently, can introduce the water temperature change slope on the overheat protection strategy based on water temperature, realize overheat protection through monitoring water temperature and water temperature change slope.
In particular, the system comprises a first comparator, a second comparator, a third comparator, an AND logic gate, a NOT logic gate, a delayer, a first selector, a second selector, a fourth comparator and an electronic control unit, wherein, the first comparator and the second comparator are used for judging the water temperature and the magnitude of the first limit value and the second limit value, the third comparator is used for judging the water temperature change slope and the magnitude of the water temperature change slope limit value, different torque selections can be provided for different temperatures and temperature change conditions through the logic gate, the non-logic gate, the delayer, the first selector and the second selector, the smaller value is selected based on the fourth comparator and is input to the electronic control unit, the electronic control unit can realize the control of the torque of the diesel engine based on the water temperature and the change slope of the water temperature, therefore, the dynamic property of the diesel engine can be guaranteed, and the diesel engine can be prevented from being damaged by overhigh water temperature.
In order to make the technical solution of the present application clearer and easier to understand, a control system of a diesel engine provided in an embodiment of the present application will be described below with reference to the accompanying drawings.
Referring to the schematic structure of the control system of the diesel engine shown in fig. 1, the control system includes a first comparator 11, a second comparator 12, a third comparator 13, an and logic gate 20, a not logic gate 21, a delay 22, a first selector 23, a second selector 24, a fourth comparator 30, and an electronic control unit 40;
wherein, the first comparator 11 is used to compare the water temperature of the diesel engine with a first limit value, i.e. the water temperature limit value 1 shown in fig. 1, the second comparator 12 is used to compare the water temperature of the diesel engine with a second limit value, i.e. the water temperature limit value 2 shown in fig. 1, the third comparator 13 is used to compare the water temperature change slope of the diesel engine with a water temperature change slope limit value, and the comparison results of the first comparator 11, the second comparator 12 and the third comparator 13 are input to the and logic gate 20;
the output result of the and logic gate 20 is input to the delay 22 and the not logic gate 21, respectively, the output result of the not logic gate 21 is input to the first selector 23, the output result is used for controlling the first selector 23 to output the maximum torque of the diesel engine or the overheat protection torque of the diesel engine, the delay 22 is used for determining whether to perform overheat protection delay according to the output result of the and logic gate 20, and the output result of the delay 22 is input to the second selector 24, the output result is used for controlling the second selector 24 to output the maximum torque of the diesel engine or the overheat protection torque of the diesel engine;
the output results of the first selector 23 and the second selector 24 are input to a fourth comparator 30, the fourth comparator 30 is configured to output a smaller value of the output results of the first selector 23 and the second selector 24, and the output result of the fourth comparator 30 is input to the electronic control unit 40, so that the electronic control unit 40 controls the torque of the diesel engine according to the output result of the fourth comparator.
In this embodiment, the first comparator 11 is specifically configured to compare whether the water temperature of the diesel engine is greater than or equal to a first limit value, and if so, the output result is 1; the second comparator 12 is specifically configured to compare whether the water temperature of the diesel engine is less than or equal to a second limit value, and if so, output a result of 1; and 13, the third comparator is specifically used for comparing whether the water temperature change slope of the diesel engine is smaller than or equal to the water temperature change slope limit value, and if so, the output result is 1. It can be understood that if the water temperature of the diesel engine is greater than or equal to the first limit and less than or equal to the second limit, and the water temperature change efficiency of the diesel engine is less than or equal to the water temperature change slope limit, the output results of the first comparator 11, the second comparator 12 and the third comparator 13 are all 1.
It should be noted that the first limit value is generally smaller than the second limit value, if the water temperature is smaller than the first limit value, the output result of the first comparator 11 is 0, and the output result of the second comparator 12 is 1, and if the water temperature is greater than the second limit value, the output result of the first comparator 11 is 1, and the output result of the second comparator 12 is 0.
For the and logic gate 20, when the output results of the first comparator 11, the second comparator 12 and the third comparator 13 are all 1, the output result of the and logic gate 20 is 1, and if one or more of the output results of the first comparator 11, the second comparator 12 or the third comparator 13 is 0, the output result of the and logic gate 20 is 0.
In the above embodiment, the delay function is activated when the delay 22 captures the rising edge of the output signal of the and logic gate. That is, if the output result of the and logic gate changes from 0 to 1, the delay unit starts the delay function to determine to perform the overheat protection delay. The overheating protection delay is carried out on the diesel engine, namely, the maximum torque of the diesel engine is still output during the time delay, and the overheating protection torque of the diesel engine is output during the non-time delay. The overheat protection torque is torque obtained by limiting torque of the diesel engine when the diesel engine is subjected to overheat protection.
As shown in fig. 1, after the and logic gate 20 outputs the signal, the signal is divided into two paths, one path includes a not logic gate 21 and a first selector 23, and for convenience of description, it is referred to as path 1; one path includes a delay 22 and a second selector 24, and is referred to as path 2 for ease of description.
For the path 1, when the output result of the not logic gate 21 changes from 0 to 1, the first selector 23 outputs the overheat protection torque of the diesel engine, otherwise, outputs the maximum torque of the diesel engine.
For the path 2, when the delay 22 starts the delay, the second selector 24 outputs the maximum torque of the diesel engine during the delay and outputs the overheat protection torque of the diesel engine during the non-delay; if the delay timer 22 is not started for delay, the second selector 24 outputs the maximum torque of the diesel engine.
Based on the above, when the water temperature of the diesel engine is greater than or equal to the first limit value and less than or equal to the second limit value, and when the water temperature change efficiency of the diesel engine is less than or equal to the water temperature change slope limit value, the output results of the first comparator 11, the second comparator 12 and the third comparator 13 are all 1, thus, the output result of the and logic gate 20 is 1, the output result of the not logic gate is 0, the first selector 23 outputs the maximum torque of the diesel engine, i.e., path 1 outputs the maximum torque of the diesel engine, and since the output result of the and logic 20 changes from 0 to 1, the delay 22 starts a delay, the second selector 24 outputs the maximum torque of the diesel engine during a delay, outputs the overheat protection torque of the diesel engine during a non-delay, that is, the path 2 outputs the maximum torque of the diesel engine during the delay time and outputs the overheat protection torque of the diesel engine during the non-delay time. And the fourth comparator 30 compares the output results of the path 1 and the path 2 and outputs a minimum value of the two, so that the fourth comparator 30 outputs a maximum torque of the diesel engine during a delay time and outputs an overheat protection torque of the diesel engine during a non-delay time.
When the water temperature of the diesel engine is smaller than the first limit value, or larger than the second limit value, or the water temperature change efficiency of the diesel engine is larger than the water temperature change slope limit value, at least 1 of the output results of the first comparator 11, the second comparator 12 and the third comparator 13 is 0, thus, the output result of the and logic gate 20 is 0, the output result of the not logic gate is changed from 0 to 1, the first selector 23 is triggered to output the overheat protection torque of the diesel engine, namely, the overheat protection torque of the diesel engine is output by the path 1, the delay 22 cannot be started for delaying, and the maximum torque of the diesel engine, namely, the maximum torque of the diesel engine is output by the second selector 24, namely, the maximum torque of the diesel engine is. The fourth comparator 30 compares the maximum torque of the diesel engine with the overheat protection torque of the diesel engine, selects a smaller value, which is generally the overheat protection torque, and outputs the smaller value to the electronic control unit 40, and the electronic control unit 40 controls the torque of the diesel engine according to the output result of the fourth comparator, for example, the output torque of the diesel engine is the overheat protection torque.
The ecu 40 may specifically adjust the output torque of the diesel engine according to the output result of the fourth comparator and the torque change rate. As shown in fig. 1, a torque change rate is provided for each of the torque rise and the torque fall, which is denoted as Krise and Kfall, and if the output result of the fourth comparator is smaller than the current torque, the torque of the diesel engine is adjusted according to Kfall, and if the output result of the fourth comparator is larger than the current torque, the torque of the diesel engine is adjusted according to Krise, wherein Krise and Kfall may be set based on empirical values. The diesel engine torque is modulated based on the RAMP, so that the working condition transition of the diesel engine is stable.
In the above embodiment, the delay time of the delay unit may be set according to requirements, for example, may be set to 60s, which is not limited in the embodiment of the present application. It should also be noted that the overheat protection torque varies with temperature. For example, when the water temperature is low, the overheat protection torque is high, and in this case, even if the output torque of the diesel engine is the overheat protection torque, the overheat protection torque is high, and the power shortage will not be generated. And when the water temperature is higher than the second limit value, the water temperature of the diesel engine is high enough to possibly influence the reliability of the diesel engine, and the overheating protection torque is lower, so that the overheating protection of the diesel engine can be timely acted, and the diesel engine is protected from being damaged.
If the water temperature of the diesel engine is between the first limit value and the second limit value and the water temperature change slope is larger than the water temperature change slope threshold value, it is indicated that water leakage occurs in a water tank of the whole vehicle or a fan has a serious fault, or the water temperature is changed abnormally and rapidly due to other reasons, and at the moment, in order to protect the diesel engine, overheat protection limitation is performed on the diesel engine based on overheat protection torque.
From the above, an embodiment of the present application provides a control system for a diesel engine, the control system includes a first comparator, a second comparator, a third comparator, an and logic gate, a non-logic gate, a delay, a first selector, a second selector, a fourth comparator, and an electronic control unit, wherein the first comparator and the second comparator are configured to determine a water temperature, a first limit value and a second limit value, the third comparator is configured to determine a water temperature change slope and a water temperature change slope limit value, different torque selections can be provided for different temperature and temperature change conditions through the and logic gate, the non-logic gate, the delay, the first selector and the second selector, a smaller value is selected based on the fourth comparator and input to the electronic control unit, so that the electronic control unit can implement control on a diesel engine torque based on the water temperature and the water temperature change slope, therefore, the dynamic property of the diesel engine can be guaranteed, and the diesel engine can be prevented from being damaged by overhigh water temperature.
Based on the foregoing, a control system of a diesel engine provided in the embodiments of the present application is further provided in the embodiments of the present application, and the control method of the diesel engine provided in the embodiments of the present application will be described below with reference to the accompanying drawings.
Referring to a flowchart of a control method of a diesel engine shown in fig. 2, the method is applied to a control system of a diesel engine provided in an embodiment of the present application, and the method includes:
s201: and acquiring the water temperature and the water temperature change slope of the diesel engine.
The water temperature of the diesel engine can be measured by the temperature sensor, and therefore the control system of the diesel engine can acquire the water temperature of the diesel engine from the temperature sensor. After the current water temperature is obtained, the water temperature change slope can be calculated based on the water temperature at the previous moment.
S202: and controlling the output torque of the diesel engine according to the water temperature and the water temperature change slope.
For the diesel engine, the reliability of the diesel engine cannot be influenced by the short-time rise of the water temperature, so that the water temperature change slope can be introduced on the basis of the water temperature to perform overheating protection, namely the output torque of the diesel engine is controlled according to the water temperature and the water temperature change slope, the situation that the power of the whole vehicle is insufficient due to the fact that the limitation of the torque is immediately performed when the water temperature rises can be avoided, and the reliability of the diesel engine is guaranteed.
In a specific implementation, the controlling of the output torque of the diesel engine according to the water temperature and the water temperature change slope may specifically be that, if the water temperature of the diesel engine is greater than or equal to a first limit and less than or equal to a second limit, and the water temperature change slope of the diesel engine is less than or equal to a water temperature change slope limit, the overheating protection is performed on the diesel engine, the maximum torque is output during the time delay, and the overheating protection torque is output during the non-time delay.
Further, if the water temperature of the diesel engine is smaller than a first limit value, the water temperature of the diesel engine is larger than a second limit value and/or the water temperature change slope of the diesel engine is larger than a water temperature change slope limit value, the diesel engine is controlled to output overheat protection torque.
Wherein the overheat protection torque is related to water temperature, which may be determined according to the water temperature of the diesel engine. When the water temperature is relatively high, the overheat protection torque is relatively low, and when the water temperature is relatively low, the overheat protection torque is relatively high.
For the sake of understanding, the control method of the diesel engine will be described below with reference to specific examples.
Aiming at a diesel engine of a certain model of a whole vehicle, a first limit value is 100 ℃ and a second limit value is 105 ℃, a temperature change slope threshold value is 10 ℃/s, if the current temperature is 95 ℃, the control system of the diesel engine controls the diesel engine to output overheating protection torque because the current temperature is less than the first limit value, the overheating protection torque corresponding to 95 ℃ is relatively high, generally, the power of the whole vehicle cannot be insufficient, if the current temperature is 102 ℃ and the temperature change slope is 5 ℃/s, the control system of the diesel engine performs overheating delay protection because the temperature is between 100 ℃ and 105 ℃ and the temperature change slope is less than the temperature change slope threshold value, the maximum torque is still output during delay, the overheating protection torque is output during non-delay, the power performance of the diesel engine is guaranteed, and the diesel engine is prevented from being damaged by overhigh water temperature. If the temperature change slope is 15 ℃/s, the control system of the diesel engine outputs overheat protection torque because the temperature change slope is larger than the temperature change slope threshold value, so that the diesel engine is prevented from being damaged by high temperature. If the temperature is 110 ℃, the control system of the diesel engine outputs overheat protection torque to prevent the overheat protection torque from being damaged because the temperature is greater than the second limit value.
Therefore, the method for controlling the diesel engine provided by the embodiment of the application obtains the water temperature and the water temperature change slope of the diesel engine by using the control system of the diesel engine, and controls the torque of the diesel engine based on the water temperature change and the water temperature change slope.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (9)
1. The control system of the diesel engine is characterized by comprising a first comparator, a second comparator, a third comparator, an AND logic gate, a NOT logic gate, a delayer, a first selector, a second selector, a fourth comparator and an electronic control unit;
the first comparator is used for comparing the water temperature of the diesel engine with a first limit value, the second comparator is used for comparing the water temperature of the diesel engine with a second limit value, the third comparator is used for comparing the water temperature change slope of the diesel engine with a water temperature change slope limit value, and the comparison results of the first comparator, the second comparator and the third comparator are input into the AND logic gate;
the output result of the and logic gate is respectively input to the delayer and the not logic gate, the output result of the not logic gate is input to the first selector and is used for controlling the first selector to output the maximum torque of the diesel engine or the overheat protection torque of the diesel engine, the delayer is used for determining whether to perform overheat protection delay according to the output result of the and logic gate, and the output result of the delayer is input to the second selector and is used for controlling the second selector to output the maximum torque of the diesel engine or the overheat protection torque of the diesel engine;
the output results of the first selector and the second selector are input into a fourth comparator, the fourth comparator is used for outputting the smaller value of the output results of the first selector and the second selector, and the output result of the fourth comparator is input into the electronic control unit, so that the electronic control unit controls the torque of the diesel engine according to the output result of the fourth comparator;
the first comparator is specifically used for comparing whether the water temperature of the diesel engine is greater than or equal to a first limit value, and if so, the output result is 1;
the second comparator is specifically used for comparing whether the water temperature of the diesel engine is smaller than or equal to a second limit value, and if so, the output result is 1;
the third comparator is specifically used for comparing whether the water temperature change slope of the diesel engine is smaller than or equal to the water temperature change slope limit value, and if yes, the output result is 1.
2. The system of claim 1, wherein the delay is specifically configured to:
and if the output result of the AND logic gate is changed from 0 to 1, starting a delay function by the delay unit, and determining to carry out overheat protection delay.
3. The system of claim 1, wherein the first selector is specifically configured to:
and when the output result of the NOT logic gate is changed from 0 to 1, outputting the overheat protection torque of the diesel engine, otherwise, outputting the maximum torque of the diesel engine.
4. The system according to claim 1, characterized in that said second selector is particularly adapted to:
if the time delayer is started for delaying time, outputting the maximum torque of the diesel engine during the delay time, and outputting the overheat protection torque of the diesel engine during the non-delay time;
and if the delayer is not started for delaying, outputting the maximum torque of the diesel engine.
5. The system according to any one of claims 1 to 4, characterized in that said electronic control unit is particularly adapted to:
and adjusting the output torque of the diesel engine according to the output result of the fourth comparator and the torque change rate.
6. A control method of a diesel engine, characterized by being applied to a control system of a diesel engine according to any one of claims 1 to 5, the method comprising:
acquiring the water temperature and the water temperature change slope of the diesel engine;
and controlling the output torque of the diesel engine according to the water temperature and the water temperature change slope.
7. The method of claim 6, wherein said controlling the output torque of the diesel engine as a function of the water temperature and the slope of change in the water temperature comprises:
and if the water temperature of the diesel engine is greater than or equal to a first limit value and less than or equal to a second limit value, and the water temperature change slope of the diesel engine is less than or equal to the water temperature change slope limit value, performing overheat delay protection on the diesel engine, outputting the maximum torque during delay, and outputting overheat protection torque during non-delay.
8. The method of claim 6, wherein said controlling the output torque of the diesel engine as a function of the water temperature and the slope of change in the water temperature comprises:
and if the water temperature of the diesel engine is smaller than a first limit value, the water temperature of the diesel engine is larger than a second limit value and/or the water temperature change slope of the diesel engine is larger than the water temperature change slope limit value, controlling the diesel engine to output overheating protection torque.
9. The method according to claim 7 or 8, wherein the overheat protection torque is determined based on a water temperature of the diesel engine.
Priority Applications (1)
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