CN114320564A - Engine coolant delivery control method and system - Google Patents
Engine coolant delivery control method and system Download PDFInfo
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- CN114320564A CN114320564A CN202210061917.7A CN202210061917A CN114320564A CN 114320564 A CN114320564 A CN 114320564A CN 202210061917 A CN202210061917 A CN 202210061917A CN 114320564 A CN114320564 A CN 114320564A
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- 239000002826 coolant Substances 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000110 cooling liquid Substances 0.000 claims abstract description 126
- 230000002159 abnormal effect Effects 0.000 claims abstract description 58
- 230000005855 radiation Effects 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 15
- 230000017525 heat dissipation Effects 0.000 claims description 99
- 230000008859 change Effects 0.000 claims description 38
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 9
- 230000009467 reduction Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
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- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
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Abstract
The invention provides a transmission control method and a transmission control system for engine coolant, which are characterized in that when an engine is in a stable working state, the valve switching state of a thermostat is controlled according to the real-time temperature of the coolant so as to ensure that the coolant can flow in time and transfer the heat of the engine to a radiator; determining whether the radiator is in a heat radiation abnormal state currently according to a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; and finally, when the radiator is determined to be in the abnormal radiating state currently, reducing the rotating speed of the engine, adjusting the valve opening state of the thermostat according to the reduced rotating speed of the engine until the actual radiating efficiency of the radiator meets the preset radiating condition, and thus, the valve opening of the thermostat can be adjusted in a linkage manner according to the actual radiating state of the radiator, so that the radiator can be enabled to radiate the engine efficiently and timely in any state.
Description
Technical Field
The invention relates to the technical field of engine cooling control, in particular to a method and a system for controlling transmission of engine cooling liquid.
Background
The automobile engine is internally provided with a cooling pipe and a radiator, cooling liquid flows through the cooling pipe, and the cooling liquid can transfer heat generated by the engine during working to the radiator for emission. The cooling pipe is also provided with a thermostat which is used as a valve mechanism for controlling the flowing state of the cooling liquid and can adjust whether the cooling liquid flows or the flowing speed state in the cooling pipe, thereby realizing the automatic heat dissipation control of the engine. The existing thermostat is directly and completely opened after an engine is started so as to enable cooling liquid to rapidly flow in a cooling pipe, and the opening of a valve cannot be adjusted according to the heat dissipation state of a radiator. If the heat dissipation performance of the radiator is reduced, if the opening degree of the valve of the thermostat is not correspondingly adjusted, more heat is accumulated in the radiator and cannot be dissipated, and the normal work of the engine is finally influenced, and even the work load of the engine is aggravated.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method and a system for controlling the transmission of engine coolant, which control the valve switching state of a thermostat according to the real-time temperature of the coolant when an engine is in a stable working state so as to ensure that the coolant can flow in time and transfer the heat of the engine to a radiator; determining whether the radiator is in a heat radiation abnormal state currently according to a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; and finally, when the radiator is determined to be in the abnormal radiating state currently, reducing the rotating speed of the engine, adjusting the valve opening state of the thermostat according to the reduced rotating speed of the engine until the actual radiating efficiency of the radiator meets the preset radiating condition, and thus, the valve opening of the thermostat can be adjusted in a linkage manner according to the actual radiating state of the radiator, so that the radiator can be ensured to radiate the engine efficiently and timely in any working state.
The invention provides an engine coolant transmission control method, which comprises the following steps:
step S1, after the engine is started, acquiring the real-time rotating speed and the real-time air intake quantity of the engine so as to determine whether the engine is in a preheating state or a stable working state at present; when the engine is in a stable working state at present, collecting the real-time temperature of the cooling liquid;
step S2, controlling the valve switch state of the thermostat according to the real-time temperature of the cooling liquid; when the thermostat is in a valve opening state, acquiring a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; determining whether the radiator is in a heat radiation abnormal state currently or not according to the first real-time hydraulic pressure and the second real-time liquid state;
step S3, when the radiator is determined to be in the abnormal radiating state, the rotating speed of the engine is reduced; adjusting the opening state of a valve of the thermostat according to the reduced rotating speed of the engine until the actual heat dissipation efficiency of the radiator meets a preset heat dissipation condition;
further, in the step S1, after the engine is started, acquiring a real-time rotation speed and a real-time air intake amount of the engine, so as to determine whether the engine is currently in a preheating state or a steady working state; and when the engine is currently in a steady working state, acquiring the real-time temperature of the cooling liquid specifically comprises:
step S101, after an engine is started, collecting the real-time rotating speed and the real-time air intake amount of the engine at a plurality of time points in a preset time period after the engine is started, and then determining the average rotating speed and the average air pressure value inside the engine in the preset time period;
step S102, if the average rotating speed is greater than or equal to a preset rotating speed threshold value and the average air pressure value is greater than or equal to a preset air pressure threshold value, determining that the engine is in a stable working state at present; otherwise, determining that the engine is in a preheating state currently;
step S103, when the engine is in a stable working state at present, acquiring the real-time temperature of cooling liquid existing in an internal pipeline of the engine;
further, in the step S2, controlling a valve opening/closing state of a thermostat according to the real-time temperature of the coolant; when the thermostat is in a valve opening state, acquiring a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; and according to the first real-time hydraulic pressure and the second real-time liquid state, determining whether the radiator is currently in the abnormal radiating state specifically comprises:
step S201, when the real-time temperature of the cooling liquid is greater than or equal to a preset temperature threshold value, indicating a valve of a thermostat to be opened; when the real-time temperature of the cooling liquid is smaller than a preset temperature threshold value, indicating a valve of the thermostat to maintain a closed state;
step S202, when the thermostat is in a valve opening state, acquiring a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat within a preset time period;
step S203, respectively determining a first hydraulic pressure change rate and a second hydraulic pressure change rate of cooling liquid in a pipeline inside the radiator and cooling liquid flowing inside the thermostat within a preset time period according to the first real-time hydraulic pressure and the second real-time hydraulic pressure; if the change rate difference value between the first hydraulic change rate and the second hydraulic change rate is within a preset difference value range, determining that the radiator is not in a heat dissipation abnormal state currently, and otherwise, determining that the radiator is in the heat dissipation abnormal state currently;
further, in the step S3, when it is determined that the radiator is currently in the abnormal heat dissipation state, the rotation speed of the engine is reduced; and then according to the rotating speed of the engine after reducing, adjusting the valve opening state of the thermostat until the actual heat dissipation efficiency of the radiator meets the preset heat dissipation condition, and concretely comprising:
step S301, when the radiator is determined to be in a heat dissipation abnormal state currently, reducing a target value according to a preset engine load, and correspondingly reducing the rotating speed of the engine;
step S302, performing closed-loop adjustment on the opening of the thermostat valve according to the reduced rotating speed of the engine, the real-time coolant flowing speed in the thermostat and the heat exchange efficiency value between the radiator and the external environment until the actual heat dissipation coefficient of the radiator is greater than or equal to a preset heat dissipation coefficient threshold value;
further, in step S302, performing closed-loop adjustment on the valve opening of the thermostat according to the reduced rotation speed of the engine, the real-time coolant flow speed inside the thermostat, and the heat exchange efficiency value between the radiator and the external environment specifically includes:
step S3021, obtaining the theoretical opening of the thermostat according to the reduced rotation speed of the engine, the real-time coolant flow rate inside the thermostat, and the heat exchange efficiency between the radiator and the external environment by using the following formula (1),
in the formula (1), θ (T) represents the theoretical valve opening of the thermostat at the current time T; t represents the current time; w represents the heat dissipation capacity of the radiator detected by the accumulation of the current external environment; l represents a contact width value of a flow pipeline of the real-time cooling liquid inside the thermostat and the engine; v (t) represents the real-time coolant flow velocity inside the thermostat; t is t0Indicating the starting time of the thermostat; eta represents the heat exchange efficiency value of the radiator and the external environment; k0Representing a preset heat dissipation coefficient threshold value; r represents the pipe radius of the flow pipe of the real-time coolant inside the thermostat; ω represents the engine reduced speed; f (ω) represents the heating temperature of the engine corresponding to the current rotational speed of the engine, which is obtained by testing the heating temperature of the engine obtained by testing the engine at different rotational speeds before the engine leaves the factory; f0Representing a temperature value of real-time coolant inside the thermostat;
step S3022, integral fine adjustment is performed on the opening degree of the valve according to the theoretical opening degree of the valve corresponding to the current time from the start of closed-loop adjustment by using the following formula (2), so that the opening degree adjustment delay of the valve is reduced,
in the above-mentioned formula (2),
the valve opening at the current moment after integral fine adjustment is represented;
step S3023, the theoretical opening of the valve is a value obtained based on a real-time temperature of the coolant inside the thermostat remaining unchanged, and in actual operation, since the temperature of the coolant itself increases during heat dissipation of the engine, it is ensured that the actual heat dissipation coefficient of the radiator is greater than or equal to the preset heat dissipation coefficient threshold in the current state, but the actual heat dissipation coefficient of the radiator is smaller than the preset heat dissipation coefficient threshold as the coolant dissipates heat to the engine, and then the valve opening at the current time after integral fine adjustment is increased by a corresponding opening margin according to the circulating recovery temperature of the coolant by using the following formula (3), thereby ensuring that the actual heat dissipation coefficient of the radiator always remains greater than or equal to the preset heat dissipation coefficient threshold,
in the above formula (3), Δ θ (T) represents an increase in the valve opening at the current time after integral trimming by a corresponding opening margin; f0(T) represents a circulating recovery temperature value of the real-time cooling liquid inside the thermostat at the current moment; during engine start-up, the valve is always open, so θ (T)>0；
Determining the opening value of the valve at the current moment as the opening value through the process
If it is
The opening value of the valve at the present time is adjusted to 360 °.
The invention also provides an engine coolant transmission control system, which comprises an engine operation state determining module, a thermostat valve switch module, a radiator working state determining module, an engine operation adjusting module and a thermostat valve opening adjusting module; wherein,
the engine operation state determining module is used for determining whether the engine is in a preheating state or a stable working state at present according to the real-time rotating speed of the engine and the real-time air intake amount after the engine is started;
the thermostat valve switch switching module is used for controlling the valve switch state of the thermostat according to the real-time temperature of the cooling liquid when the engine is in a stable working state at present;
the radiator working state determining module is used for determining whether the radiator is in a heat radiation abnormal state currently according to a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat when the thermostat is in a valve opening state;
the engine operation adjusting module is used for reducing the rotating speed of the engine when the radiator is determined to be in the abnormal radiating state currently;
the thermostat valve opening adjusting module is used for adjusting the valve opening state of the thermostat according to the reduced rotating speed of the engine until the actual heat dissipation efficiency of the radiator meets a preset heat dissipation condition;
further, the engine operation state determination module is used for determining whether the engine is in a preheating state or a stable working state according to the real-time rotating speed of the engine and the real-time air intake amount after the engine is started, and specifically comprises:
after the engine is started, determining the average rotating speed of the engine and the average air pressure value inside the engine within a preset time period according to the real-time rotating speed of the engine at a plurality of time points and the real-time air intake amount within the preset time period after the engine is started;
if the average rotating speed is greater than or equal to a preset rotating speed threshold value and the average air pressure value is greater than or equal to a preset air pressure threshold value, determining that the engine is in a stable working state at present; otherwise, determining that the engine is in a preheating state currently;
further, the thermostat valve switch switching module is used for controlling the thermostat valve switch state according to the real-time temperature of the coolant when the engine is currently in a stable working state, and specifically comprises:
when the engine is in a stable working state at present, comparing the real-time temperature of the cooling liquid existing in the internal pipeline of the engine with a preset temperature threshold value;
when the real-time temperature of the cooling liquid is greater than or equal to a preset temperature threshold value, indicating that a valve of the thermostat is opened; when the real-time temperature of the cooling liquid is smaller than a preset temperature threshold value, indicating a valve of the thermostat to maintain a closed state;
and the number of the first and second groups,
the radiator working state determining module is used for determining whether the radiator is in a heat dissipation abnormal state or not according to a first real-time hydraulic pressure corresponding to a coolant in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a coolant flowing in the thermostat when the thermostat is in a valve opening state, and specifically comprises the following steps:
when the thermostat is in a valve opening state, respectively determining a first hydraulic pressure change rate and a second hydraulic pressure change rate of the cooling liquid in the radiator internal pipeline and the cooling liquid flowing inside the thermostat within a preset time period according to a first real-time hydraulic pressure corresponding to the cooling liquid in the radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to the cooling liquid flowing inside the thermostat within the preset time period; if the change rate difference value between the first hydraulic change rate and the second hydraulic change rate is within a preset difference value range, determining that the radiator is not in a heat dissipation abnormal state currently, and otherwise, determining that the radiator is in the heat dissipation abnormal state currently;
further, the engine operation adjusting module is configured to, when it is determined that the radiator is currently in the abnormal heat dissipation state, reduce the rotation speed of the engine specifically includes:
when the radiator is determined to be in the abnormal radiating state currently, the target value is reduced according to the preset engine load, and the rotating speed of the engine is correspondingly reduced;
and the number of the first and second groups,
the thermostat valve opening adjustment module is used for adjusting the valve opening state of the thermostat according to the rotating speed of the engine after being reduced until the actual heat dissipation efficiency of the radiator meets the preset heat dissipation condition, and the thermostat valve opening adjustment module specifically comprises the following steps:
and performing closed-loop adjustment on the opening of the valve of the thermostat according to the reduced rotating speed of the engine, the real-time coolant flowing speed in the thermostat and the heat exchange efficiency value between the radiator and the external environment until the actual heat dissipation coefficient of the radiator is greater than or equal to a preset heat dissipation coefficient threshold value.
Compared with the prior art, the engine coolant transmission control method and the engine coolant transmission control system control the valve opening and closing state of the thermostat according to the real-time temperature of the coolant when the engine is in a stable working state, so that the coolant can flow in time and the heat of the engine is transferred to the radiator; determining whether the radiator is in a heat radiation abnormal state currently according to a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; and finally, when the radiator is determined to be in the abnormal radiating state currently, reducing the rotating speed of the engine, adjusting the valve opening state of the thermostat according to the reduced rotating speed of the engine until the actual radiating efficiency of the radiator meets the preset radiating condition, and thus, the valve opening of the thermostat can be adjusted in a linkage manner according to the actual radiating state of the radiator, so that the radiator can be enabled to radiate the engine efficiently and timely in any state.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an engine coolant delivery control method according to the present invention.
Fig. 2 is a schematic structural diagram of an engine coolant delivery control system provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flow chart of a method for controlling delivery of engine coolant according to an embodiment of the present invention is shown. The engine coolant transmission control method comprises the following steps:
step S1, after the engine is started, acquiring the real-time rotating speed and the real-time air intake quantity of the engine so as to determine whether the engine is in a preheating state or a stable working state at present; when the engine is in a stable working state at present, collecting the real-time temperature of the cooling liquid;
step S2, controlling the valve switch state of the thermostat according to the real-time temperature of the cooling liquid; when the thermostat is in a valve opening state, acquiring a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; determining whether the radiator is in a heat radiation abnormal state currently or not according to the first real-time hydraulic pressure and the second real-time liquid state;
step S3, when the radiator is determined to be in the abnormal radiating state, the rotating speed of the engine is reduced; and adjusting the opening state of the valve of the thermostat according to the reduced rotating speed of the engine until the actual heat dissipation efficiency of the radiator meets the preset heat dissipation condition.
The beneficial effects of the above technical scheme are: when the engine is in a stable working state, the engine coolant transmission control method controls the valve switching state of the thermostat according to the real-time temperature of the coolant so as to ensure that the coolant can flow in time and transfer the heat of the engine to a radiator; determining whether the radiator is in a heat radiation abnormal state currently according to a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; and finally, when the radiator is determined to be in the abnormal radiating state currently, reducing the rotating speed of the engine, adjusting the valve opening state of the thermostat according to the reduced rotating speed of the engine until the actual radiating efficiency of the radiator meets the preset radiating condition, and thus, the valve opening of the thermostat can be adjusted in a linkage manner according to the actual radiating state of the radiator, so that the radiator can be enabled to radiate the engine efficiently and timely in any state.
Preferably, in the step S1, after the engine is started, the real-time rotation speed and the real-time air intake amount of the engine are collected, so as to determine whether the engine is currently in the preheating state or the steady working state; and when the engine is currently in a steady working state, acquiring the real-time temperature of the cooling liquid specifically comprises:
step S101, after an engine is started, collecting the real-time rotating speed and the real-time air intake amount of the engine at a plurality of time points in a preset time period after the engine is started, and then determining the average rotating speed and the average air pressure value inside the engine in the preset time period;
step S102, if the average rotating speed is greater than or equal to a preset rotating speed threshold value and the average air pressure value is greater than or equal to a preset air pressure threshold value, determining that the engine is in a stable working state at present; otherwise, determining that the engine is in a preheating state currently;
and step S103, when the engine is in a stable working state at present, acquiring the real-time temperature of the cooling liquid existing in the internal pipeline of the engine.
The beneficial effects of the above technical scheme are: after the automobile engine is started, the rotating speed of the engine is gradually increased to a stable state, and meanwhile, the engine can suck corresponding amount of air to realize fuel combustion in the engine, and at the moment, the engine can firstly enter a preheating state. In the preheating state, the engine cannot output power outwards stably, the temperature inside the engine is not too high, and the cooling liquid does not need to flow in the cooling pipe to transfer and dissipate heat of the engine. When the engine enters a stable working state from a preheating state, the turning of the engine is obviously increased, and the air amount sucked in the engine is correspondingly increased, namely the air pressure value in the engine is improved. Then further collecting the real-time temperature of the cooling liquid existing in the internal pipeline of the engine so as to rapidly trigger the thermostat to work.
Preferably, in the step S2, the valve on-off state of the thermostat is controlled according to the real-time temperature of the cooling liquid; when the thermostat is in a valve opening state, acquiring a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; and according to the first real-time hydraulic pressure and the second real-time liquid state, determining whether the radiator is currently in the abnormal radiating state specifically comprises:
step S201, when the real-time temperature of the cooling liquid is greater than or equal to a preset temperature threshold value, indicating a valve of a thermostat to be opened; when the real-time temperature of the cooling liquid is smaller than a preset temperature threshold value, indicating a valve of the thermostat to maintain a closed state;
step S202, when the thermostat is in a valve opening state, acquiring a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat within a preset time period;
step S203, respectively determining a first hydraulic pressure change rate and a second hydraulic pressure change rate of the cooling liquid in the internal pipeline of the radiator and the cooling liquid flowing inside the thermostat within a preset time period according to the first real-time hydraulic pressure and the second real-time hydraulic pressure; and if the change rate difference value between the first hydraulic change rate and the second hydraulic change rate is within a preset difference value range, determining that the radiator is not in the abnormal heat dissipation state currently, and otherwise, determining that the radiator is in the abnormal heat dissipation state currently.
The beneficial effects of the above technical scheme are: when the real-time temperature of the cooling liquid existing in the internal pipeline of the engine is greater than or equal to the preset temperature threshold value, the heat accumulated in the internal pipeline of the engine reaches the corresponding upper limit. At the moment, the valve of the thermostat is opened, so that the cooling liquid can flow circularly in real time, and the heat in the engine is transferred to the radiator to be radiated. When the thermostat is in a valve opening state, cooling liquid circularly flows in the cooling pipe, and if the radiator is in a normal radiating state, the hydraulic pressures of the cooling liquid at the respective positions of the thermostat and the radiator are consistent; if the radiator is in an abnormal heat dissipation state, the cooling liquid at the radiator can be subjected to effective heat exchange with the outside, so that the hydraulic pressure of the cooling liquid at the radiator can be higher than that of the cooling liquid at the thermostat, and whether the heat dissipation of the radiator is normal or not can be quickly determined by determining the change rate difference value between the first hydraulic change rate and the second hydraulic change rate of the cooling liquid in the internal pipeline of the radiator and the cooling liquid flowing inside the thermostat in a preset time period, so that the valve opening of the thermostat can be accurately adjusted subsequently.
Preferably, in this step S3, when it is determined that the radiator is currently in the heat radiation abnormal state, the rotation speed of the engine is reduced; and then according to the rotating speed of the engine after reducing, adjusting the valve opening state of the thermostat until the actual heat dissipation efficiency of the radiator meets the preset heat dissipation condition, and concretely comprising:
step S301, when the radiator is determined to be in a heat dissipation abnormal state currently, reducing a target value according to a preset engine load, and correspondingly reducing the rotating speed of the engine;
step S302, according to the reduced rotating speed of the engine, the real-time coolant flowing speed in the thermostat and the heat exchange efficiency value between the radiator and the external environment, the valve opening of the thermostat is adjusted in a closed loop mode until the actual heat dissipation coefficient of the radiator is larger than or equal to a preset heat dissipation coefficient threshold value.
The beneficial effects of the above technical scheme are: when the radiator is determined to be in a heat radiation abnormal state at present, namely the radiator cannot radiate heat from the engine in time and quickly at present, the target value is reduced according to the preset engine load, and the rotating speed of the engine is correspondingly reduced, so that the heat generated by the engine can be reduced, and the heat radiation work load of the radiator is reduced; the rotation speed of the engine is correspondingly reduced according to a preset engine load reduction target value, and the rotation speed reduction value of the engine can be determined according to the actual torque or power output condition of the engine, which belongs to the conventional technical means in the field and is not described in detail herein. In addition, according to the reduced rotating speed of the engine, the real-time coolant flowing speed in the thermostat and the heat exchange efficiency value between the radiator and the external environment, the valve opening of the thermostat is adjusted in a closed loop mode, linkage adjustment of the valve opening of the thermostat and the real-time heat dissipation efficiency of the radiator can be guaranteed, the thermostat can adjust the flowing speed of the coolant through change of the valve opening in time, and therefore the coolant can transfer heat of the engine to the radiator in time in the circulating flowing process.
Preferably, in step S302, the performing closed-loop adjustment on the valve opening of the thermostat according to the reduced rotation speed of the engine, the real-time coolant flow speed inside the thermostat, and the heat exchange efficiency value between the radiator and the external environment specifically includes:
step S3021, obtaining the theoretical opening of the thermostat according to the reduced rotation speed of the engine, the real-time coolant flow rate inside the thermostat, and the heat exchange efficiency between the radiator and the external environment by using the following formula (1),
in the formula (1), θ (T) represents the theoretical opening of the valve of the thermostat at the current time T; t represents the current time; w represents the heat dissipation capacity of the radiator detected by the accumulation of the current external environment; l represents the contact width value of a flow pipeline of the real-time cooling liquid inside the thermostat and the engine; v (t) represents the real-time coolant flow velocity inside the thermostat; t is t0Indicating the starting time of the thermostat; eta represents the heat exchange efficiency value of the radiator and the external environment; k0Representing a preset heat dissipation coefficient threshold value; r represents the pipe radius of the real-time coolant flow pipe inside the thermostat; ω represents the engine reduced speed; f (ω) represents the heating temperature of the engine corresponding to the current rotational speed of the engine, which is obtained by testing the heating temperature of the engine obtained by testing the engine at different rotational speeds before the engine leaves the factory; f0A temperature value representing a real-time coolant inside the thermostat;
step S3022, integral fine adjustment is performed on the opening degree of the valve according to the theoretical opening degree of the valve corresponding to the current time from the start of closed-loop adjustment by using the following formula (2), so that the opening degree adjustment delay of the valve is reduced,
in the above-mentioned formula (2),
the valve opening at the current moment after integral fine adjustment is represented;
step S3023, the theoretical opening of the valve is a value obtained based on the real-time temperature of the coolant inside the thermostat remaining unchanged, and in actual operation, since the temperature of the coolant itself increases during the heat dissipation of the engine, it is ensured that the actual heat dissipation coefficient of the radiator is greater than or equal to the preset heat dissipation coefficient threshold in the current state, but the actual heat dissipation coefficient of the radiator is smaller than the preset heat dissipation coefficient threshold as the coolant dissipates heat to the engine, and then the valve opening at the current time after integral fine adjustment is increased by a corresponding opening margin according to the circulating recovery temperature of the coolant by using the following formula (3), thereby ensuring that the actual heat dissipation coefficient of the radiator always remains greater than or equal to the preset heat dissipation coefficient threshold,
in the above formula (3), Δ θ (T) represents an increase in the valve opening at the current time after integral trimming by a corresponding opening margin; f0(T) represents the circulating recovery temperature value of the real-time cooling liquid in the thermostat at the current moment; during engine start-up, the valve is always open, so θ (T)>0；
Determining the opening value of the valve at the current moment as the opening value through the process
If it is
The opening value of the valve at the present time is adjusted to 360 °.
The beneficial effects of the above technical scheme are: obtaining the theoretical opening of the valve of the thermostat according to the reduced rotating speed of the engine, the real-time coolant flowing speed in the thermostat and the heat exchange efficiency value of the radiator and the external environment by using the formula (1), and further forming closed-loop valve regulation in a pure theoretical environment, thereby establishing the theoretical basis of valve control and ensuring the reliability of the valve control; then, integral fine adjustment is carried out on the theoretical opening size of the valve at the current moment according to the theoretical opening size of the valve from the closed-loop adjustment to the current moment by using the formula (2), so that the problem of valve delay control is avoided to the maximum extent; and finally, increasing the opening allowance of the valve opening after integral fine adjustment according to the circulating temperature of the cooling liquid by using the formula (3), so that the actual heat dissipation coefficient of the radiator can be always greater than or equal to a preset heat dissipation coefficient threshold value, the heat dissipation stability and the heat dissipation efficiency are ensured, meanwhile, the waste of the cooling liquid can be avoided by controlling the valve in real time, and resources are saved.
Referring to fig. 2, a schematic structural diagram of an engine coolant delivery control system according to an embodiment of the present invention is shown. The engine coolant transmission control system comprises an engine operation state determining module, a thermostat valve switch module, a radiator working state determining module, an engine operation adjusting module and a thermostat valve opening adjusting module; wherein,
the engine operation state determining module is used for determining whether the engine is in a preheating state or a stable working state at present according to the real-time rotating speed of the engine and the real-time air intake amount after the engine is started;
the thermostat valve switch switching module is used for controlling the valve switch state of the thermostat according to the real-time temperature of the cooling liquid when the engine is in a stable working state at present;
the radiator working state determining module is used for determining whether the radiator is in a heat radiation abnormal state currently according to a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat when the thermostat is in a valve opening state;
the engine operation adjusting module is used for reducing the rotating speed of the engine when the radiator is determined to be in the abnormal radiating state currently;
the thermostat valve opening adjusting module is used for adjusting the valve opening state of the thermostat according to the reduced rotating speed of the engine until the actual heat dissipation efficiency of the radiator meets the preset heat dissipation condition.
The beneficial effects of the above technical scheme are: when the engine is in a stable working state, the engine coolant transmission control system controls the valve switching state of the thermostat according to the real-time temperature of the coolant so as to ensure that the coolant can flow in time and transfer the heat of the engine to a radiator; determining whether the radiator is in a heat radiation abnormal state currently according to a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; and finally, when the radiator is determined to be in the abnormal radiating state currently, reducing the rotating speed of the engine, adjusting the valve opening state of the thermostat according to the reduced rotating speed of the engine until the actual radiating efficiency of the radiator meets the preset radiating condition, and thus, the valve opening of the thermostat can be adjusted in a linkage manner according to the actual radiating state of the radiator, so that the radiator can be enabled to radiate the engine efficiently and timely in any state.
Preferably, the engine operating state determining module is configured to determine whether the engine is currently in the preheating state or the steady operating state according to the real-time rotating speed of the engine and the real-time air intake amount after the engine is started, and specifically includes:
after the engine is started, determining the average rotating speed of the engine and the average air pressure value inside the engine within a preset time period according to the real-time rotating speed of the engine at a plurality of time points and the real-time air intake amount within the preset time period after the engine is started;
if the average rotating speed is greater than or equal to a preset rotating speed threshold value and the average air pressure value is greater than or equal to a preset air pressure threshold value, determining that the engine is in a stable working state at present; otherwise, it is determined that the engine is currently in a warm-up state.
The beneficial effects of the above technical scheme are: after the automobile engine is started, the rotating speed of the engine is gradually increased to a stable state, and meanwhile, the engine can suck corresponding amount of air to realize fuel combustion in the engine, and at the moment, the engine can firstly enter a preheating state. In the preheating state, the engine cannot output power outwards stably, the temperature inside the engine is not too high, and the cooling liquid does not need to flow in the cooling pipe to transfer and dissipate heat of the engine. When the engine enters a stable working state from a preheating state, the turning of the engine is obviously increased, and the air amount sucked in the engine is correspondingly increased, namely the air pressure value in the engine is improved. Then further collecting the real-time temperature of the cooling liquid existing in the internal pipeline of the engine so as to rapidly trigger the thermostat to work.
Preferably, the thermostat valve switch switching module is configured to control the thermostat valve switch state according to the real-time temperature of the coolant when the engine is currently in a steady operation state, and specifically includes:
when the engine is in a stable working state at present, comparing the real-time temperature of the cooling liquid existing in the internal pipeline of the engine with a preset temperature threshold value;
when the real-time temperature of the cooling liquid is greater than or equal to a preset temperature threshold value, indicating that a valve of the thermostat is opened; when the real-time temperature of the cooling liquid is smaller than a preset temperature threshold value, indicating a valve of the thermostat to maintain a closed state;
and the number of the first and second groups,
the radiator working state determination module is used for determining whether a radiator is in a heat dissipation abnormal state or not according to first real-time hydraulic pressure corresponding to cooling liquid in a radiator internal pipeline of an engine and second real-time hydraulic pressure corresponding to cooling liquid flowing in the thermostat when the thermostat is in a valve opening state, and specifically comprises the following steps:
when the thermostat is in a valve opening state, respectively determining a first hydraulic pressure change rate and a second hydraulic pressure change rate of the cooling liquid in the radiator internal pipeline and the cooling liquid flowing inside the thermostat within a preset time period according to a first real-time hydraulic pressure corresponding to the cooling liquid in the radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to the cooling liquid flowing inside the thermostat within the preset time period; and if the change rate difference value between the first hydraulic change rate and the second hydraulic change rate is within a preset difference value range, determining that the radiator is not in the abnormal heat dissipation state currently, and otherwise, determining that the radiator is in the abnormal heat dissipation state currently.
The beneficial effects of the above technical scheme are: when the real-time temperature of the cooling liquid existing in the internal pipeline of the engine is greater than or equal to the preset temperature threshold value, the heat accumulated in the internal pipeline of the engine reaches the corresponding upper limit. At the moment, the valve of the thermostat is opened, so that the cooling liquid can flow circularly in real time, and the heat in the engine is transferred to the radiator to be radiated. When the thermostat is in a valve opening state, cooling liquid circularly flows in the cooling pipe, and if the radiator is in a normal radiating state, the hydraulic pressures of the cooling liquid at the respective positions of the thermostat and the radiator are consistent; if the radiator is in an abnormal heat dissipation state, the cooling liquid at the radiator can be subjected to effective heat exchange with the outside, so that the hydraulic pressure of the cooling liquid at the radiator can be higher than that of the cooling liquid at the thermostat, and whether the heat dissipation of the radiator is normal or not can be quickly determined by determining the change rate difference value between the first hydraulic change rate and the second hydraulic change rate of the cooling liquid in the internal pipeline of the radiator and the cooling liquid flowing inside the thermostat in a preset time period, so that the valve opening of the thermostat can be accurately adjusted subsequently.
Preferably, the engine operation adjusting module is configured to, when it is determined that the radiator is currently in the abnormal heat dissipation state, reduce the rotation speed of the engine specifically includes:
when the radiator is determined to be in the abnormal radiating state currently, the target value is reduced according to the preset engine load, and the rotating speed of the engine is correspondingly reduced;
and the number of the first and second groups,
this thermostat valve opening adjustment module is used for the rotational speed according to the engine after reducing, adjusts the valve opening state of thermostat, specifically includes until the actual radiating efficiency of radiator satisfies the preset heat dissipation condition:
and performing closed-loop adjustment on the opening of the valve of the thermostat according to the reduced rotating speed of the engine, the real-time coolant flowing speed in the thermostat and the heat exchange efficiency value between the radiator and the external environment until the actual heat dissipation coefficient of the radiator is greater than or equal to a preset heat dissipation coefficient threshold value.
The beneficial effects of the above technical scheme are: when the radiator is determined to be in a heat radiation abnormal state at present, namely the radiator cannot radiate heat from the engine in time and quickly at present, the target value is reduced according to the preset engine load, and the rotating speed of the engine is correspondingly reduced, so that the heat generated by the engine can be reduced, and the heat radiation work load of the radiator is reduced; the rotation speed of the engine is correspondingly reduced according to a preset engine load reduction target value, and the rotation speed reduction value of the engine can be determined according to the actual torque or power output condition of the engine, which belongs to the conventional technical means in the field and is not described in detail herein. In addition, according to the reduced rotating speed of the engine, the real-time coolant flowing speed in the thermostat and the heat exchange efficiency value between the radiator and the external environment, the valve opening of the thermostat is adjusted in a closed loop mode, linkage adjustment of the valve opening of the thermostat and the real-time heat dissipation efficiency of the radiator can be guaranteed, the thermostat can adjust the flowing speed of the coolant through change of the valve opening in time, and therefore the coolant can transfer heat of the engine to the radiator in time in the circulating flowing process.
From the content of the above embodiment, the engine coolant transmission control method and system control the valve on-off state of the thermostat according to the real-time temperature of the coolant when the engine is in a steady working state, so as to ensure that the coolant can flow in time and transfer the heat of the engine to the radiator; determining whether the radiator is in a heat radiation abnormal state currently according to a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; and finally, when the radiator is determined to be in the abnormal radiating state currently, reducing the rotating speed of the engine, adjusting the valve opening state of the thermostat according to the reduced rotating speed of the engine until the actual radiating efficiency of the radiator meets the preset radiating condition, and thus, the valve opening of the thermostat can be adjusted in a linkage manner according to the actual radiating state of the radiator, so that the radiator can be enabled to radiate the engine efficiently and timely in any state.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The engine coolant transmission control method is characterized by comprising the following steps:
step S1, after the engine is started, acquiring the real-time rotating speed and the real-time air intake quantity of the engine so as to determine whether the engine is in a preheating state or a stable working state at present; when the engine is in a stable working state at present, collecting the real-time temperature of the cooling liquid;
step S2, controlling the valve switch state of the thermostat according to the real-time temperature of the cooling liquid; when the thermostat is in a valve opening state, acquiring a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; determining whether the radiator is in a heat radiation abnormal state currently or not according to the first real-time hydraulic pressure and the second real-time liquid state;
step S3, when the radiator is determined to be in the abnormal radiating state, the rotating speed of the engine is reduced; and adjusting the opening state of the valve of the thermostat according to the reduced rotating speed of the engine until the actual heat dissipation efficiency of the radiator meets the preset heat dissipation condition.
2. The engine coolant delivery control method according to claim 1, characterized in that:
in step S1, after the engine is started, acquiring a real-time rotation speed and a real-time air intake amount of the engine, so as to determine whether the engine is currently in a preheating state or a steady operating state; and when the engine is currently in a steady working state, acquiring the real-time temperature of the cooling liquid specifically comprises:
step S101, after an engine is started, collecting the real-time rotating speed and the real-time air intake amount of the engine at a plurality of time points in a preset time period after the engine is started, and then determining the average rotating speed and the average air pressure value inside the engine in the preset time period;
step S102, if the average rotating speed is greater than or equal to a preset rotating speed threshold value and the average air pressure value is greater than or equal to a preset air pressure threshold value, determining that the engine is in a stable working state at present; otherwise, determining that the engine is in a preheating state currently;
and step S103, when the engine is in a stable working state at present, acquiring the real-time temperature of the cooling liquid existing in the internal pipeline of the engine.
3. The engine coolant delivery control method according to claim 2, characterized in that:
in step S2, controlling a valve opening/closing state of a thermostat according to the real-time temperature of the coolant; when the thermostat is in a valve opening state, acquiring a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat; and according to the first real-time hydraulic pressure and the second real-time liquid state, determining whether the radiator is currently in the abnormal radiating state specifically comprises:
step S201, when the real-time temperature of the cooling liquid is greater than or equal to a preset temperature threshold value, indicating a valve of a thermostat to be opened; when the real-time temperature of the cooling liquid is smaller than a preset temperature threshold value, indicating a valve of the thermostat to maintain a closed state;
step S202, when the thermostat is in a valve opening state, acquiring a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat within a preset time period;
step S203, respectively determining a first hydraulic pressure change rate and a second hydraulic pressure change rate of cooling liquid in a pipeline inside the radiator and cooling liquid flowing inside the thermostat within a preset time period according to the first real-time hydraulic pressure and the second real-time hydraulic pressure; and if the change rate difference value between the first hydraulic change rate and the second hydraulic change rate is within a preset difference value range, determining that the radiator is not in the abnormal heat dissipation state currently, and otherwise, determining that the radiator is in the abnormal heat dissipation state currently.
4. The engine coolant delivery control method according to claim 3, characterized in that:
in the step S3, when it is determined that the radiator is currently in the abnormal heat dissipation state, the rotation speed of the engine is reduced; and then according to the rotating speed of the engine after reducing, adjusting the valve opening state of the thermostat until the actual heat dissipation efficiency of the radiator meets the preset heat dissipation condition, and concretely comprising:
step S301, when the radiator is determined to be in a heat dissipation abnormal state currently, reducing a target value according to a preset engine load, and correspondingly reducing the rotating speed of the engine;
step S302, according to the reduced rotating speed of the engine, the real-time coolant flowing speed in the thermostat and the heat exchange efficiency value between the radiator and the external environment, the valve opening of the thermostat is adjusted in a closed loop mode until the actual heat dissipation coefficient of the radiator is larger than or equal to a preset heat dissipation coefficient threshold value.
5. The engine coolant delivery control method according to claim 4, characterized in that:
in step S302, performing closed-loop adjustment on the valve opening of the thermostat according to the reduced rotation speed of the engine, the real-time coolant flow speed inside the thermostat, and the heat exchange efficiency value between the radiator and the external environment specifically includes:
step S3021, obtaining the theoretical opening of the thermostat according to the reduced rotation speed of the engine, the real-time coolant flow rate inside the thermostat, and the heat exchange efficiency between the radiator and the external environment by using the following formula (1),
in the formula (1), θ (T) represents the theoretical valve opening of the thermostat at the current time T; t represents the current time; w represents the heat dissipation capacity of the radiator detected by the accumulation of the current external environment; l represents a contact width value of a flow pipeline of the real-time cooling liquid inside the thermostat and the engine; v (t) represents the real-time coolant flow velocity inside the thermostat; t is t0Indicating the starting time of the thermostat; eta represents the heat exchange efficiency value of the radiator and the external environment; k0Representing a preset heat dissipation coefficient threshold value; r represents the pipe radius of the flow pipe of the real-time coolant inside the thermostat; ω represents the engine reduced speed; f (ω) represents the heating temperature of the engine corresponding to the current rotational speed of the engine, which is obtained by testing the heating temperature of the engine obtained by testing the engine at different rotational speeds before the engine leaves the factory; f0Representing a temperature value of real-time coolant inside the thermostat;
step S3022, integral fine adjustment is performed on the opening degree of the valve according to the theoretical opening degree of the valve corresponding to the current time from the start of closed-loop adjustment by using the following formula (2), so that the opening degree adjustment delay of the valve is reduced,
in the above-mentioned formula (2),
the valve opening at the current moment after integral fine adjustment is represented; step S3023, the theoretical opening of the valve is a value obtained based on the real-time temperature of the coolant in the thermostat being kept constant, and in actual work, the coolant is distributedWhen the temperature of the engine rises during the heat dissipation process, the actual heat dissipation coefficient of the radiator is ensured to be larger than or equal to the preset heat dissipation coefficient threshold value under the current state, but the actual heat dissipation coefficient of the radiator caused by heat dissipation of the engine along with the cooling liquid is smaller than the preset heat dissipation coefficient threshold value, the corresponding opening margin is increased to the valve opening at the current moment after integral fine adjustment according to the circulating recovery temperature of the cooling liquid by using the following formula (3), and the actual heat dissipation coefficient of the radiator is ensured to be always larger than or equal to the preset heat dissipation coefficient threshold value,
in the above formula (3), Δ θ (T) represents an increase in the valve opening at the current time after integral trimming by a corresponding opening margin; f0(T) represents a circulating recovery temperature value of the real-time cooling liquid inside the thermostat at the current moment; during engine start-up, the valve is always open, so θ (T)>0；
Determining the opening value of the valve at the current moment as the opening value through the process
If it is
The opening value of the valve at the present time is adjusted to 360 °.
6. The engine coolant transmission control system is characterized by comprising an engine operation state determining module, a thermostat valve switch module, a radiator working state determining module, an engine operation adjusting module and a thermostat valve opening adjusting module; wherein,
the engine operation state determining module is used for determining whether the engine is in a preheating state or a stable working state at present according to the real-time rotating speed of the engine and the real-time air intake amount after the engine is started;
the thermostat valve switch switching module is used for controlling the valve switch state of the thermostat according to the real-time temperature of the cooling liquid when the engine is in a stable working state at present;
the radiator working state determining module is used for determining whether the radiator is in a heat radiation abnormal state currently according to a first real-time hydraulic pressure corresponding to a cooling liquid in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a cooling liquid flowing in the thermostat when the thermostat is in a valve opening state;
the engine operation adjusting module is used for reducing the rotating speed of the engine when the radiator is determined to be in the abnormal radiating state currently;
the thermostat valve opening adjusting module is used for adjusting the valve opening state of the thermostat according to the reduced rotating speed of the engine until the actual heat dissipation efficiency of the radiator meets the preset heat dissipation condition.
7. The engine coolant delivery control system of claim 6, wherein:
the engine operation state determination module is used for determining whether the engine is in a preheating state or a stable operation state according to the real-time rotating speed and the real-time air intake quantity of the engine after the engine is started, and specifically comprises the following steps:
after the engine is started, determining the average rotating speed of the engine and the average air pressure value inside the engine within a preset time period according to the real-time rotating speed of the engine at a plurality of time points and the real-time air intake amount within the preset time period after the engine is started;
if the average rotating speed is greater than or equal to a preset rotating speed threshold value and the average air pressure value is greater than or equal to a preset air pressure threshold value, determining that the engine is in a stable working state at present; otherwise, it is determined that the engine is currently in a warm-up state.
8. The engine coolant delivery control system of claim 7, wherein:
the thermostat valve switch module is used for controlling the thermostat valve switch state according to the real-time temperature of the cooling liquid when the engine is in a stable working state at present, and specifically comprises:
when the engine is in a stable working state at present, comparing the real-time temperature of the cooling liquid existing in the internal pipeline of the engine with a preset temperature threshold value;
when the real-time temperature of the cooling liquid is greater than or equal to a preset temperature threshold value, indicating that a valve of the thermostat is opened; when the real-time temperature of the cooling liquid is smaller than a preset temperature threshold value, indicating a valve of the thermostat to maintain a closed state;
and the number of the first and second groups,
the radiator working state determining module is used for determining whether the radiator is in a heat dissipation abnormal state or not according to a first real-time hydraulic pressure corresponding to a coolant in a radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to a coolant flowing in the thermostat when the thermostat is in a valve opening state, and specifically comprises the following steps:
when the thermostat is in a valve opening state, respectively determining a first hydraulic pressure change rate and a second hydraulic pressure change rate of the cooling liquid in the radiator internal pipeline and the cooling liquid flowing inside the thermostat within a preset time period according to a first real-time hydraulic pressure corresponding to the cooling liquid in the radiator internal pipeline of the engine and a second real-time hydraulic pressure corresponding to the cooling liquid flowing inside the thermostat within the preset time period; and if the change rate difference value between the first hydraulic change rate and the second hydraulic change rate is within a preset difference value range, determining that the radiator is not in the abnormal heat dissipation state currently, and otherwise, determining that the radiator is in the abnormal heat dissipation state currently.
9. The engine coolant delivery control system of claim 8, wherein:
the engine operation adjusting module is configured to, when it is determined that the radiator is currently in the abnormal heat dissipation state, reduce the rotation speed of the engine, and specifically includes:
when the radiator is determined to be in the abnormal radiating state currently, the target value is reduced according to the preset engine load, and the rotating speed of the engine is correspondingly reduced;
and the number of the first and second groups,
the thermostat valve opening adjustment module is used for adjusting the valve opening state of the thermostat according to the rotating speed of the engine after being reduced until the actual heat dissipation efficiency of the radiator meets the preset heat dissipation condition, and the thermostat valve opening adjustment module specifically comprises the following steps:
and performing closed-loop adjustment on the opening of the valve of the thermostat according to the reduced rotating speed of the engine, the real-time coolant flowing speed in the thermostat and the heat exchange efficiency value between the radiator and the external environment until the actual heat dissipation coefficient of the radiator is greater than or equal to a preset heat dissipation coefficient threshold value.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012177308A (en) * | 2011-02-25 | 2012-09-13 | Hitachi Automotive Systems Ltd | Cooling system of internal combustion engine |
| CN105698851A (en) * | 2016-01-28 | 2016-06-22 | 广西柳工机械股份有限公司 | An engineering machinery heat radiation system monitoring system and monitoring method |
| CN111648860A (en) * | 2020-07-14 | 2020-09-11 | 三一重机有限公司 | Radiator diagnosis system, diagnosis method and diagnosis device for engineering machinery |
| CN113494347A (en) * | 2021-08-09 | 2021-10-12 | 一汽解放汽车有限公司 | Control method of engine cooling system and engine cooling system |
| CN113685260A (en) * | 2021-09-07 | 2021-11-23 | 上海华兴数字科技有限公司 | Cooling system fault diagnosis method and device and working machine |
| CN113685259A (en) * | 2021-08-17 | 2021-11-23 | 东风汽车集团股份有限公司 | Engine thermostat fault judgment method, device and equipment |
-
2022
- 2022-01-19 CN CN202210061917.7A patent/CN114320564B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012177308A (en) * | 2011-02-25 | 2012-09-13 | Hitachi Automotive Systems Ltd | Cooling system of internal combustion engine |
| CN105698851A (en) * | 2016-01-28 | 2016-06-22 | 广西柳工机械股份有限公司 | An engineering machinery heat radiation system monitoring system and monitoring method |
| CN111648860A (en) * | 2020-07-14 | 2020-09-11 | 三一重机有限公司 | Radiator diagnosis system, diagnosis method and diagnosis device for engineering machinery |
| CN113494347A (en) * | 2021-08-09 | 2021-10-12 | 一汽解放汽车有限公司 | Control method of engine cooling system and engine cooling system |
| CN113685259A (en) * | 2021-08-17 | 2021-11-23 | 东风汽车集团股份有限公司 | Engine thermostat fault judgment method, device and equipment |
| CN113685260A (en) * | 2021-09-07 | 2021-11-23 | 上海华兴数字科技有限公司 | Cooling system fault diagnosis method and device and working machine |
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