CN114294088A - Cooling system control method and device, cooling system and driving equipment - Google Patents
Cooling system control method and device, cooling system and driving equipment Download PDFInfo
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- CN114294088A CN114294088A CN202111645394.2A CN202111645394A CN114294088A CN 114294088 A CN114294088 A CN 114294088A CN 202111645394 A CN202111645394 A CN 202111645394A CN 114294088 A CN114294088 A CN 114294088A
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Abstract
The invention discloses a cooling system control method, a cooling system control device, a cooling system and a driving device, wherein the method comprises the steps of judging whether the water temperature of an engine is higher than the initial temperature of a thermostat and lower than the maximum working water temperature of the engine when the engine continuously works under the allowable power; if so, judging whether the current load rate of the engine is greater than a preset load value; if so, controlling the fan not to intervene, and controlling the water pump to be switched to full-speed operation; judging whether the current gradient value of the vehicle running is larger than a preset gradient value or not and whether the predicted passing time is larger than or equal to a preset time length or not; if so, judging whether the difference between the water temperature of the engine and the maximum working water temperature is smaller than a preset temperature difference; if yes, the fan is controlled to be involved. The cooling system and the cooling method have the advantages that the complexity of the control logic of the cooling system is reduced, the energy consumption of the cooling accessories is reduced, and the service life of the cooling accessories is prolonged.
Description
Technical Field
The embodiment of the invention relates to the technical field of engine control, in particular to a cooling system control method, a cooling system control device, a cooling system and driving equipment.
Background
The existing intelligent control mode of the cooling system mostly adopts a target water temperature control method: the method comprises the steps of calculating a difference value between actual water temperature and target water temperature based on parameters such as engine rotating speed, load rate, accelerator pedal opening degree and water temperature measured in real time, and reducing the difference value as much as possible through combined application of an electronic water pump, an electronic thermostat and an electronic control fan; in the other method, the water temperature change rate is calculated firstly, the water temperature trend is predicted according to the actual water temperature and the water temperature change rate, and the control is carried out through an intelligent thermostat, a water pump, a fan and the like.
Regardless of the method, an engine ECU (Electronic Control Unit) is required to acquire relevant data in real time and send a Control instruction to Control the action of the intelligent accessory, and in the actual use process, the intelligent accessory is influenced by factors such as load, different vehicle configurations, road conditions, ambient temperature and the like, so that the complexity of the Control logic is high, energy cannot be saved on the contrary when an operation command is frequently executed, and the service lives of the intelligent accessories such as a water pump, a thermostat, a fan and the like can be shortened.
Disclosure of Invention
The embodiment of the invention provides a cooling system control method, a cooling system control device, a cooling system and driving equipment, and solves the technical problems of complex control logic, high energy consumption and short service life caused by frequent command execution of a cooling accessory in a cooling system control mode in the prior art.
The embodiment of the invention provides a cooling system control method, which comprises the following steps:
judging whether the water temperature of the engine is greater than the initial temperature of the thermostat and less than the maximum working water temperature of the engine when the engine continuously works under the allowable power;
if so, judging whether the current load rate of the engine is greater than a preset load value;
if the current load rate is larger than the preset load value, controlling the fan not to be involved, and controlling the water pump to be switched to full-speed operation, wherein the full-speed operation means that the operation speed of the water pump is the product of the engine speed and the gear transmission ratio;
judging whether the current gradient value of the vehicle running is larger than a preset gradient value or not and whether the predicted passing time is larger than or equal to a preset time length or not;
if the current gradient value is larger than the preset gradient value and the estimated passing time is larger than or equal to the preset duration, judging whether the difference between the engine water temperature and the maximum working water temperature is smaller than a preset temperature difference;
and if the difference between the water temperature of the engine and the maximum working water temperature is smaller than a preset temperature difference, controlling a fan to intervene.
Further, the cooling system control method further includes:
and if the water temperature of the engine is less than or equal to the initial temperature of the thermostat, controlling the fan not to intervene, and controlling the water pump to be switched to low-speed operation, wherein the low-speed operation means that the operation speed of the water pump is the product of the engine speed and the transmission ratio of a silicon oil clutch, or the operation speed of the water pump is the product of the engine speed and the transmission ratio of an electromagnetic clutch.
Further, the cooling system control method further includes:
and if the water temperature of the engine is greater than or equal to the maximum working water temperature, controlling the water pump to be switched to full-speed operation, and controlling the fan to operate for auxiliary cooling.
Further, the cooling system control method further includes:
and if the current load rate is less than or equal to the preset load value, controlling the fan not to intervene, and switching the water pump to operate at a low speed.
Further, the cooling system control method further includes:
and if the current gradient value is smaller than or equal to the preset gradient value and the predicted passing time is smaller than the preset duration, maintaining the water pump to be in full-speed operation and controlling the fan not to intervene.
Further, the determining whether the current gradient value of the vehicle running is greater than the preset gradient value and the predicted passing time is greater than or equal to the preset duration comprises:
obtaining the gradient information of the running front of the vehicle through an electronic map, wherein the gradient information at least comprises the current gradient value;
determining the predicted transit time based on the grade information and the current travel speed of the vehicle;
and judging whether the current gradient value is larger than a preset gradient value or not, and judging whether the predicted passing time is larger than or equal to a preset time length or not.
Further, if the difference between the engine water temperature and the maximum working water temperature is smaller than a preset temperature difference, after the intervention of a fan, the control method of the cooling system further comprises:
judging whether the water temperature of the engine is in an optimal working temperature range or not;
and if so, controlling the fan to stop running.
An embodiment of the present invention further provides a cooling system control device, where the cooling system control device includes:
the temperature judging unit is used for judging whether the water temperature of the engine is greater than the initial temperature of the thermostat and less than the maximum working water temperature when the engine continuously works under the allowable power;
the load judging unit is used for judging whether the current load rate of the engine is greater than a preset load value or not if the judging result of the temperature judging unit is that the water temperature of the engine is greater than the initial temperature of the thermostat and less than the maximum working water temperature;
the control unit is used for controlling the fan not to intervene and controlling the water pump to be switched to full-speed operation if the judgment result of the load judgment unit is that the current load rate is larger than the preset load value, wherein the full-speed operation refers to the operation speed of the water pump which is the product of the engine speed and the gear transmission ratio;
the slope passing judging unit is used for judging whether the current slope value of the running vehicle is greater than a preset slope value or not and whether the predicted passing time is greater than or equal to a preset duration or not;
the temperature difference judging unit is used for judging whether the difference between the water temperature of the engine and the maximum working water temperature is smaller than a preset temperature difference or not if the judgment result of the gradient passing judging unit is that the current gradient value is larger than the preset gradient value and the predicted passing time is larger than or equal to the preset time length;
the control unit is further used for controlling the fan to intervene if the judgment result of the temperature difference judgment unit is that the difference between the engine water temperature and the maximum working water temperature is smaller than a preset temperature difference.
The embodiment of the invention also provides a cooling system, which comprises the cooling system control device in any embodiment, an engine, a water pump, a fan and a thermostat;
the cooling system control device is electrically connected with the engine, the water pump, the fan and the thermostat respectively; the water pump is an electronic water pump and is arranged on the engine.
An embodiment of the present invention further provides a driving apparatus, which includes the cooling system in any of the above embodiments.
The embodiment of the invention discloses a cooling system control method, a cooling system control device, a cooling system and driving equipment, wherein the method comprises the steps of judging whether the water temperature of an engine is higher than the initial temperature of a thermostat and lower than the maximum working water temperature of the engine when the engine continuously works under the allowable power; if so, judging whether the current load rate of the engine is greater than a preset load value; if the current load rate is larger than the preset load value, controlling the fan not to be involved, and controlling the water pump to be switched to full-speed operation; judging whether the current gradient value of the vehicle running is larger than a preset gradient value or not and whether the predicted passing time is larger than or equal to a preset time length or not; if the current gradient value is larger than the preset gradient value and the predicted passing time is larger than or equal to the preset duration, judging whether the difference between the water temperature of the engine and the maximum working water temperature is smaller than the preset temperature difference; and if the difference between the water temperature of the engine and the maximum working water temperature is smaller than the preset temperature difference, controlling the fan to intervene. The cooling system control method and the cooling system solve the technical problems that in the prior art, the control logic is complex, the energy consumption is high and the service life is short due to the fact that the cooling accessory frequently executes commands, the complexity of the control logic of the cooling system is reduced, the energy consumption of the cooling accessory is reduced, and the service life of the cooling accessory is prolonged.
Drawings
FIG. 1 is a flow chart of a method for controlling a cooling system according to an embodiment of the present invention;
FIG. 2 is a flow chart of another cooling system control method provided by an embodiment of the present invention;
FIG. 3 is a flow chart of another cooling system control method provided by an embodiment of the present invention;
FIG. 4 is a flow chart of another cooling system control method provided by an embodiment of the present invention;
FIG. 5 is a flow chart of yet another cooling system control method provided by an embodiment of the present invention;
fig. 6 is a structural diagram of a cooling system control device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
It should be noted that the terms "first", "second", and the like in the description and claims of the present invention and the accompanying drawings are used for distinguishing different objects, and are not used for limiting a specific order. The following embodiments of the present invention may be implemented individually, or in combination with each other, and the embodiments of the present invention are not limited in this respect.
The whole vehicle cooling system is a module with large energy consumption, has a good energy-saving excavation space, and reasonable engine oil temperature and engine oil viscosity can be guaranteed by reasonable water temperature, so that the energy efficiency of the engine oil can be exerted to the maximum, and the energy-saving effect is achieved. At present, the control logic of many cooling systems is based on accurate water temperature control, namely, a target water temperature is set, background calculation is continuously carried out, and related cooling accessories are controlled to continuously act and combine to act, so that the actual water temperature is controlled to be close to the target water temperature. However, the continuous operation and the continuous action are inherently a loss, for example, when the vehicle temperature suddenly rises to a value higher than the target water temperature, the fan is immediately involved, and in fact, the duration of the high temperature is very short, and the introduction and withdrawal of the fan wastes much energy, so that the energy consumption is increased.
The method and the device consider three types of situations, namely the overtaking situation, namely the sudden acceleration in a short time and the constant speed recovery; secondly, the climbing time is short, and the temperature can rise temporarily when the accelerator is increased for a short time; and thirdly, the load factor is lower than the situation of eta r, wherein eta r represents the load factor of the engine when the heat quantity taken by the required cooling liquid when the engine is at a certain load factor at a certain rotating speed is balanced with the heat radiation quantity of the whole vehicle when the thermostat is fully opened, the water pump is at full speed and the fan is not used. The three cases account for most of the actual operation, and unnecessary energy loss is caused by over-precise and frequent intervention; and the input parameters are many, the change is frequent, the water temperature change is more complex after the manual intervention, the operation difficulty is increased, and the water temperature fluctuation is abnormal. Therefore, the control method of the cooling system provided by the application aims at avoiding excessive intervention on the three conditions, and avoids the intervention of a fan as far as possible in the actual control process, so that the energy consumption is reduced, and the change of the water temperature is smoother. The following describes a control method of a cooling system provided in an embodiment of the present application.
Fig. 1 is a flowchart of a cooling system control method according to an embodiment of the present invention. As shown in fig. 1, the cooling system control method specifically includes the following steps:
s101, judging whether the water temperature of the engine is greater than the initial temperature of the thermostat and less than the maximum working water temperature when the engine continuously works under the allowable power.
Specifically, a commonly used thermostat is a wax thermostat, which switches a valve on and off through thermal expansion and contraction of paraffin when the water temperature changes, so as to control the flow direction of water flow. In order to achieve the energy-saving effect, the intervention sequence of the cooling accessories is set to be thermostat priority, water pump priority and fan last, and therefore the water temperature of the engine is controlled by the thermostat at the initial moment. In the process of regulating and controlling the water temperature of the engine, the water temperature of the engine is firstly obtained, and the relation between the water temperature of the engine and the initial temperature of the thermostat as well as the maximum allowable working water temperature when the engine continuously works under the allowable power is judged, so that whether the water pump needs to be intervened or not is judged, and the rotating speed of the water pump after intervention is determined.
And S102, if yes, judging whether the current load rate of the engine is larger than a preset load value.
Specifically, the load factor refers to a ratio between an actual power and a rated power of the engine, and the preset load value is η r in the above. It should be noted that, because the heat dissipation capacity of the entire vehicle has a great relationship with the parameters of the entire vehicle radiator, the ambient temperature, the windward side, and the like, it is necessary to calibrate η r of the entire vehicle at different ambient temperatures and at different rotation speeds, so as to ensure that the entire vehicle can meet the heat dissipation requirement without a fan under the η r.
If the water temperature of the engine is higher than the initial temperature of the thermostat and lower than the maximum working water temperature, the fan does not need to be intervened, only the water pump needs to be intervened for auxiliary temperature control, and the intervening rotating speed of the water pump needs to be further confirmed according to the relation between the current load capacity and the preset load value of the engine.
And S103, if the current load rate is larger than the preset load value, controlling the fan not to be involved, and controlling the water pump to be switched to full-speed operation, wherein the full-speed operation refers to that the operation speed of the water pump is the product of the engine speed and the gear transmission ratio.
Specifically, if the current load rate is greater than the preset load value and the current load rate continues for the preset duration time to be greater than the preset load value, the water pump is controlled to run at full speed, wherein the preset duration time can be set to 10s as required, and can also be set to other durations as required. At this time, the water pump is connected with the engine through the gear, so that the rotation speed of the water pump is the product of the rotation speed of the engine and the gear transmission ratio, namely the full-speed operation of the water pump means that the operation speed of the water pump is the product of the rotation speed of the engine and the gear transmission ratio.
And S104, judging whether the current gradient value of the vehicle running is larger than the preset gradient value and whether the predicted passing time is larger than or equal to the preset duration.
Specifically, after the water pump is involved in operation, whether the fan is required to be involved in auxiliary temperature control needs to be further judged according to the driving road condition of the vehicle.
Alternatively, S104, determining whether the current gradient value of the vehicle travel is greater than the preset gradient value and the predicted transit time is greater than or equal to the preset duration includes: acquiring gradient information in front of the vehicle in running through an electronic map, wherein the gradient information at least comprises a current gradient value; determining an expected transit time based on the grade information and the current travel speed of the vehicle; and judging whether the current gradient value is greater than a preset gradient value or not, and judging whether the predicted passing time is greater than or equal to a preset time length or not.
Specifically, the vehicle ECU may obtain road condition information in front of the vehicle via an electronic map provided on the vehicle, where the road condition information mainly includes gradient information, such as a current gradient value; after acquiring current gradient information, the ECU calculates the predicted passing time required for the vehicle to pass through the front gradient at the current speed based on the current running speed and the gradient information; and then judging whether the predicted passing time is greater than or equal to a preset time length or not, and judging whether the current gradient value in the gradient information is greater than the preset gradient value or not, wherein the preset time length can be set to 10min as required, and the preset gradient value can be set to 1 degree as required.
And S105, if the current gradient value is greater than the preset gradient value and the predicted passing time is greater than or equal to the preset duration, judging whether the difference between the water temperature of the engine and the maximum working water temperature is less than the preset temperature difference.
S106, if the difference between the water temperature of the engine and the maximum working water temperature is smaller than the preset temperature difference, controlling the fan to intervene.
Specifically, if the current gradient value is greater than the preset gradient value and the predicted passing time is greater than or equal to the preset duration, whether the fan needs to be controlled for intervention temperature control is further determined according to the temperature difference between the engine water temperature and the maximum working water temperature. And if the difference between the water temperature of the engine and the maximum working water temperature is smaller than a preset temperature difference, controlling the fan to intervene for controlling the temperature so that the water temperature of the engine does not exceed the maximum working water temperature, wherein the preset temperature difference can be set to be 5 ℃ according to requirements.
In short, in the embodiment of the invention, whether the water pump and the fan need to be controlled or not is further judged by judging whether the heat dissipation quantity required by the engine in different operation areas can meet the requirement when the fan is not started in the whole vehicle, and the operation rotating speed of the water pump is more consistent with the operation condition of the current engine for cooling when the water pump is controlled to intervene, so that the setting of controlling the water temperature of the engine through logical intervention of each cooling accessory is reasonably controlled.
It should be noted that the load factor can also be characterized by the ratio between the engine torque and the maximum torque at a certain engine speed, and therefore, the current load factor of the engine can also be obtained by obtaining the engine speed and the engine torque.
The cooling system control method and the cooling system solve the technical problems that in the prior art, the control logic is complex, the energy consumption is high and the service life is short due to the fact that the cooling accessory frequently executes commands, the complexity of the control logic of the cooling system is reduced, the energy consumption of the cooling accessory is reduced, and the service life of the cooling accessory is prolonged.
On the basis of the above technical solutions of the present invention, fig. 2 is a flowchart of another cooling system control method provided in an embodiment of the present invention, and as shown in fig. 2, the cooling system control method further includes:
s201, if the water temperature of the engine is less than or equal to the initial temperature of the thermostat, the fan is controlled not to be involved, and the water pump is controlled to be switched to low-speed operation, wherein the low-speed operation means that the operation speed of the water pump is the product of the engine speed and the transmission ratio of the silicone oil clutch, or the operation speed of the water pump is the product of the engine speed and the transmission ratio of the electromagnetic clutch.
Specifically, if the result of the judgment shows that the water temperature of the engine is less than or equal to the initial temperature of the thermostat, it indicates that the water temperature of the engine is too low at the moment, and the normal temperature operation of the engine cannot be guaranteed due to too low temperature, so that the water temperature of the engine needs to be rapidly increased by controlling the water pump to operate at a low speed, and the effects of rapidly heating the vehicle and further reducing the oil consumption are achieved. Specifically, if there is a difference between the engine water temperature and the oil temperature and the water temperature is too low, the oil temperature will be low, increasing the viscosity of the lubricating oil, and the friction work will be increased by the increase in viscosity of the lubricating oil, resulting in higher fuel consumption of the engine.
The water pump can be connected with the engine through the silicone oil clutch or the electromagnetic clutch, at the moment, the rotating speed of the water pump is in a low-speed running state, and the rotating speed of the water pump is the product of the rotating speed of the engine and the transmission ratio of the silicone oil clutch or the product of the rotating speed of the water pump and the transmission ratio of the electromagnetic clutch.
On the basis of the above technical solutions of the present invention, fig. 3 is a flowchart of another cooling system control method according to an embodiment of the present invention, and as shown in fig. 3, the cooling system control method further includes:
s301, if the water temperature of the engine is larger than or equal to the maximum working water temperature, controlling the water pump to run at full speed, and controlling the fan to run for auxiliary cooling.
Specifically, when the judgment result shows that the water temperature of the engine is greater than or equal to the maximum working water temperature, the water pump is controlled to run at full speed, and the fan is controlled to be involved in auxiliary cooling, so that the water temperature of the engine is reduced to be lower than the maximum working water temperature.
On the basis of the above technical solutions of the present invention, fig. 4 is a flowchart of another cooling system control method provided in an embodiment of the present invention, and as shown in fig. 4, the cooling system control method further includes:
s401, if the current load rate is smaller than or equal to the preset load value, the fan is controlled not to be involved, and the water pump is switched to low-speed operation.
Specifically, if the current load rate is smaller than or equal to the preset load value according to the judgment result, the fan is controlled not to be involved, and the water pump is switched to low-speed operation, so that the water temperature of the engine is kept to be lower than the maximum working water temperature by 5-15 ℃ for working.
On the basis of the above technical solutions of the present invention, fig. 5 is a flowchart of another cooling system control method according to an embodiment of the present invention, and as shown in fig. 5, the cooling system control method further includes:
s501, if the current gradient value is smaller than or equal to the preset gradient value and the predicted passing time is smaller than the preset duration, the water pump is maintained to be in full-speed operation, and the fan is controlled not to be involved.
Specifically, if the current gradient value is smaller than or equal to the preset gradient value and the predicted passing time is shorter than the preset duration, it is indicated that the current gradient of the vehicle is small, the water temperature of the engine is only temporarily increased, and the fan is not required to be involved to assist in cooling, so that the fan is controlled not to be involved, and the full-speed operation of the water pump is maintained.
In addition to the above technical solutions of the present invention, after step S106, the cooling system control method further includes: judging whether the water temperature of the engine is in an optimal working temperature range or not; and if so, controlling the fan to stop running.
Specifically, after the fan is involved in working, whether the water temperature of the engine is in the optimal working temperature range is judged, and if yes, the fan can be controlled to stop running so as to reduce loss.
Fig. 6 is a structural diagram of a cooling system control device according to an embodiment of the present invention. As shown in fig. 6, the cooling system control apparatus includes:
the temperature judging unit 61 is used for judging whether the water temperature of the engine is greater than the initial temperature of the thermostat and is less than the maximum working water temperature when the engine continuously works under the allowable power;
a load judgment unit 62, configured to judge whether a current load rate of the engine is greater than a preset load value if a judgment result of the temperature judgment unit is that the engine water temperature is greater than the thermostat initial temperature and less than the maximum working water temperature;
the control unit 63 is configured to control the fan not to be involved and control the water pump to switch to full-speed operation if the judgment result of the load judgment unit is that the current load rate is greater than the preset load value, where the full-speed operation refers to that the operation speed of the water pump is a product of the engine speed and the gear transmission ratio;
a gradient passing determination unit 64 for determining whether a current gradient value of the vehicle running is greater than a preset gradient value and whether a predicted passing time is greater than or equal to a preset duration;
a temperature difference determination unit 65, configured to determine whether a difference between the engine water temperature and the maximum working water temperature is less than a preset temperature difference if the determination result of the slope passage determination unit is that the current slope value is greater than a preset slope value and the expected passage time is greater than or equal to a preset duration;
the control unit is also used for controlling the fan to intervene if the judgment result of the temperature difference judgment unit is that the difference between the water temperature of the engine and the maximum working water temperature is smaller than the preset temperature difference.
Alternatively, if the determination result of the temperature determination unit 61 is that the engine water temperature is less than or equal to the thermostat initial temperature, the control unit 63 is further configured to control the fan to be not involved, and control the water pump to switch to a low-speed operation, where the low-speed operation refers to that the operation speed of the water pump is a product of the engine speed and the transmission ratio of the silicone oil clutch, or that the operation speed of the water pump is a product of the engine speed and the transmission ratio of the electromagnetic clutch.
Alternatively, if the judgment result of the temperature judgment unit 61 is that the engine water temperature is greater than or equal to the maximum working water temperature, the control unit 63 is further configured to control the water pump to switch to full-speed operation, and control the fan to operate to assist in cooling.
Optionally, if the determination result of the load determination unit 62 is that the current load rate is less than or equal to the preset load value, the control unit 63 is further configured to control the fan not to be involved, and switch the water pump to low-speed operation.
Alternatively, if the determination result of the gradient passing determination unit 64 is that the current gradient value is less than or equal to the preset gradient value and the predicted passing time is less than the preset duration, the control unit 63 is further configured to maintain the water pump in full-speed operation and control the fan not to be involved.
Optionally, the gradient passing determination unit 64 is specifically configured to:
acquiring gradient information in front of the vehicle in running through an electronic map, wherein the gradient information at least comprises a current gradient value;
determining an expected transit time based on the grade information and the current travel speed of the vehicle;
and judging whether the current gradient value is greater than a preset gradient value or not, and judging whether the predicted passing time is greater than or equal to a preset time length or not.
Alternatively, if the temperature difference determination unit 65 determines that the difference between the engine water temperature and the maximum working water temperature is smaller than the preset temperature difference, and the control unit 63 controls the fan to intervene, the temperature determination unit 61 is further configured to: judging whether the water temperature of the engine is in an optimal working temperature range or not; if yes, the control unit 63 is further configured to control the fan to stop operating.
The device provided by the embodiment of the present invention has the same implementation principle and technical effect as the method embodiments, and for the sake of brief description, reference may be made to the corresponding contents in the method embodiments without reference to the device embodiments.
The cooling system control device provided by the embodiment of the invention has the same technical characteristics as the cooling system control method provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
The embodiment of the invention also provides a cooling system, which comprises the cooling system control device of any embodiment, an engine, a water pump, a fan and a thermostat; the cooling system control device is respectively and electrically connected with the engine, the water pump, the fan and the thermostat; the water pump is an electronic water pump and is arranged on the engine.
The cooling system provided by the embodiment of the present invention includes the cooling system control device in the above embodiment, and therefore, the cooling system provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not described herein again.
The embodiment of the invention also provides a driving device which comprises the cooling system in any embodiment.
The driving device provided by the embodiment of the present invention includes the cooling system in the above embodiment, so that the driving device provided by the embodiment of the present invention also has the beneficial effects described in the above embodiment, and details are not described herein again.
In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Finally, it should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A cooling system control method, characterized by comprising:
judging whether the water temperature of the engine is greater than the initial temperature of the thermostat and less than the maximum working water temperature of the engine when the engine continuously works under the allowable power;
if so, judging whether the current load rate of the engine is greater than a preset load value;
if the current load rate is larger than the preset load value, controlling the fan not to be involved, and controlling the water pump to be switched to full-speed operation, wherein the full-speed operation means that the operation speed of the water pump is the product of the engine speed and the gear transmission ratio;
judging whether the current gradient value of the vehicle running is larger than a preset gradient value or not and whether the predicted passing time is larger than or equal to a preset time length or not;
if the current gradient value is larger than the preset gradient value and the estimated passing time is larger than or equal to the preset duration, judging whether the difference between the engine water temperature and the maximum working water temperature is smaller than a preset temperature difference;
and if the difference between the water temperature of the engine and the maximum working water temperature is smaller than a preset temperature difference, controlling a fan to intervene.
2. The cooling system control method according to claim 1, characterized by further comprising:
and if the water temperature of the engine is less than or equal to the initial temperature of the thermostat, controlling the fan not to intervene, and controlling the water pump to be switched to low-speed operation, wherein the low-speed operation means that the operation speed of the water pump is the product of the engine speed and the transmission ratio of a silicon oil clutch, or the operation speed of the water pump is the product of the engine speed and the transmission ratio of an electromagnetic clutch.
3. The cooling system control method according to claim 1, characterized by further comprising:
and if the water temperature of the engine is greater than or equal to the maximum working water temperature, controlling the water pump to be switched to full-speed operation, and controlling the fan to operate for auxiliary cooling.
4. The cooling system control method according to claim 1, characterized by further comprising:
and if the current load rate is less than or equal to the preset load value, controlling the fan not to intervene, and switching the water pump to operate at a low speed.
5. The cooling system control method according to claim 1, characterized by further comprising:
and if the current gradient value is smaller than or equal to the preset gradient value and the predicted passing time is smaller than the preset duration, maintaining the water pump to be in full-speed operation and controlling the fan not to intervene.
6. The cooling system control method according to claim 1, wherein the determining whether the current gradient value at which the vehicle is running is greater than a preset gradient value and the predicted transit time is greater than or equal to a preset period of time includes:
obtaining the gradient information of the running front of the vehicle through an electronic map, wherein the gradient information at least comprises the current gradient value;
determining the predicted transit time based on the grade information and the current travel speed of the vehicle;
and judging whether the current gradient value is larger than a preset gradient value or not, and judging whether the predicted passing time is larger than or equal to a preset time length or not.
7. The cooling system control method according to claim 1, wherein if the difference between the engine water temperature and the maximum operating water temperature is smaller than a preset temperature difference, after controlling a fan to intervene, the cooling system control method further comprises:
judging whether the water temperature of the engine is in an optimal working temperature range or not;
and if so, controlling the fan to stop running.
8. A cooling system control apparatus, characterized by comprising:
the temperature judging unit is used for judging whether the water temperature of the engine is greater than the initial temperature of the thermostat and less than the maximum working water temperature when the engine continuously works under the allowable power;
the load judging unit is used for judging whether the current load rate of the engine is greater than a preset load value or not if the judging result of the temperature judging unit is that the water temperature of the engine is greater than the initial temperature of the thermostat and less than the maximum working water temperature;
the control unit is used for controlling the fan not to intervene and controlling the water pump to be switched to full-speed operation if the judgment result of the load judgment unit is that the current load rate is larger than the preset load value, wherein the full-speed operation refers to the operation speed of the water pump which is the product of the engine speed and the gear transmission ratio;
the slope passing judging unit is used for judging whether the current slope value of the running vehicle is greater than a preset slope value or not and whether the predicted passing time is greater than or equal to a preset duration or not;
the temperature difference judging unit is used for judging whether the difference between the water temperature of the engine and the maximum working water temperature is smaller than a preset temperature difference or not if the judgment result of the gradient passing judging unit is that the current gradient value is larger than the preset gradient value and the predicted passing time is larger than or equal to the preset time length;
the control unit is further used for controlling the fan to intervene if the judgment result of the temperature difference judgment unit is that the difference between the engine water temperature and the maximum working water temperature is smaller than a preset temperature difference.
9. A cooling system comprising the cooling system control device according to claim 8, further comprising an engine, a water pump, a fan, and a thermostat;
the cooling system control device is electrically connected with the engine, the water pump, the fan and the thermostat respectively; the water pump is an electronic water pump and is arranged on the engine.
10. Steering device, characterized in that it comprises a cooling system according to claim 9.
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| CN114294088B (en) | 2022-10-28 |
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Address after: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee after: WEICHAI POWER Co.,Ltd. Patentee after: Weichai Hydraulic Transmission Co.,Ltd. Address before: 261061 Shandong city in Weifang province Fu hi tech Industrial Development Zone, East Street No. 197 Patentee before: WEICHAI POWER Co.,Ltd. Patentee before: LINDE HYDRAULICS (CHINA) Co.,Ltd. |