CN113311886A - Self-adaptive lubricating oil temperature control method - Google Patents
Self-adaptive lubricating oil temperature control method Download PDFInfo
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- CN113311886A CN113311886A CN202110452144.0A CN202110452144A CN113311886A CN 113311886 A CN113311886 A CN 113311886A CN 202110452144 A CN202110452144 A CN 202110452144A CN 113311886 A CN113311886 A CN 113311886A
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Abstract
The invention aims to provide a self-adaptive lubricating oil temperature control method, which comprises the following steps: setting the target value of the oil temperature PI controller as the optimal working temperature Te, setting the optimal working range as [ A, B ], and when the oil temperature feedback value is in the interval, no adjustment is needed; when the temperature of the lubricating oil is lower than A, if the temperature of the lubricating oil is in a decreasing trend, starting the temperature control PI regulation of the lubricating oil, and if the temperature of the lubricating oil is in an increasing trend, keeping the current output until the temperature of the lubricating oil reaches the optimal working range; and when the temperature of the lubricating oil is higher than B, judging the current trend of the temperature change of the lubricating oil, starting the PI regulation of the temperature control of the lubricating oil if the temperature of the lubricating oil is in the rising trend, and keeping the current output until the temperature of the lubricating oil reaches the optimal working range if the temperature of the lubricating oil is in the falling trend. The invention can well improve the stability of the automatic control device for the temperature of the lubricating oil and the hysteresis response characteristic of the temperature of the lubricating oil.
Description
Technical Field
The invention relates to a control method of a ship power device, in particular to a method for controlling lubricating oil of the ship power device.
Background
The ship power device provides continuous power for the navigation of the ship. In this process, the relevant equipment of the power plant, such as a rotating turbine, needs to be lubricated by matching with lubricating oil at any time. When the equipment works, mechanical energy is continuously generated and converted into heat energy due to the rotating working property, and the temperature of lubricating oil changes along with the change of working conditions. The lubricating oil is too high in temperature, quality change is generated, the lubricating effect cannot be achieved, the damage to a unit can be caused, and when the temperature is higher than a certain limit value, the unit must be decelerated and stopped. The temperature of the lubricating oil is too low, the viscosity of the lubricating oil is enhanced, the lubricating effect is weakened, the pressure of the lubricating oil is increased when the lubricating oil is serious, and the operation of a unit is also influenced. The temperature of the lubricating oil needs to be maintained within a suitable range. The temperature of the lubricating oil is adjusted by cooling the seawater, the seawater is pumped by the circulating water pump, and then the flow of the cooling water of the lubricating oil working system is controlled by opening and closing the valve, so that the temperature change of the lubricating oil is controlled. The oil temperature control has two modes of manual operation and automatic operation, wherein the manual mode is that a manual button adjusts the opening degree of a valve, the automatic mode is that an optimal temperature value is set in a controller, the opening degree of the valve is calculated and output to an actuating mechanism according to the deviation of the fed back oil temperature and the optimal temperature value, and the actuating mechanism acts until the oil temperature reaches the optimal temperature. The current automatic control has the following three problems.
1) The optimum operating temperature of the oil should be a range, not just a specific value. The automatic control is performed according to the optimum operating value of the lubricant, which is disadvantageous to the stability of the lubricant temperature control device. Even if the temperature of the lubricating oil slightly changes, the controller needs to calculate and output the temperature as long as the temperature deviates from the optimal value, and actually the calculation and the output have little significance, the slight change of the temperature does not make the temperature exceed the optimal working range, and the quality of the lubricating oil is not influenced.
2) Temperature control is itself a hysteresis process. The change of the temperature of the lubricating oil caused by the change of the sailing working condition is a lagging process, the change of the temperature of the lubricating oil caused by the cooling of the seawater is also a lagging process, and the two lagging processes exist in the same control system and are not beneficial to the stability of the control of the temperature of the lubricating oil. If the current oil temperature is lower than the optimal working value, the oil temperature control device should close the opening of the valve to reduce the flow rate of cooling water, but the actual influence of the current sailing working condition on the oil temperature is a trend of increasing the oil temperature, under the two actions, the oil temperature can rise quickly, and the controller is difficult to adjust back.
3) Although the target value of the oil temperature control is a fixed value or a specific range, the oil temperature itself is disturbed at any time due to various disturbances, such as the seawater temperature, the ambient temperature, the rotating speed of the circulating pump, the sailing state and the like, and all the disturbances are balanced by controlling the cooling water amount to achieve the steady state. This control process can be understood as a dynamic tracking process and belongs to an indirect control process. Such uncertainties increase the difficulty of control.
Disclosure of Invention
The invention aims to provide an adaptive lubricating oil temperature control method which can well improve the stability of an automatic lubricating oil temperature control device and the hysteresis response characteristic of the lubricating oil temperature.
The purpose of the invention is realized as follows:
the invention discloses a self-adaptive lubricating oil temperature control method, which is characterized by comprising the following steps:
1) setting the target value of the oil temperature PI controller as the optimal working temperature Te, setting the optimal working range as [ A, B ], and when the feedback value of the oil temperature is in the interval, without adjustment, Te belongs to [ A, B ];
2) when the temperature of the lubricating oil is lower than A, judging the current trend of the temperature change of the lubricating oil, if the temperature of the lubricating oil is in a decreasing trend, starting the temperature control PI regulation of the lubricating oil, and if the temperature of the lubricating oil is in an increasing trend, keeping the current output until the temperature of the lubricating oil reaches the optimal working range;
3) and when the temperature of the lubricating oil is higher than B, judging the current trend of the temperature change of the lubricating oil, starting the PI regulation of the temperature control of the lubricating oil if the temperature of the lubricating oil is in the rising trend, and keeping the current output until the temperature of the lubricating oil reaches the optimal working range if the temperature of the lubricating oil is in the falling trend.
The present invention may further comprise:
1. the current lubricating oil temperature is T, the change trend is Q, and the lubricating oil temperature is controlled according to the following logic strategy:
the temperature of the lubricating oil at the former moment is Tn-1, the temperature of the current lubricating oil is T, the temperature of the lubricating oil at the latter moment is Tn +1,
the calculation mode of the variation trend Q is as follows:
if Tn +1-T is less than or equal to 0 and T-Tn-1 is less than or equal to 0, Q is less than or equal to 0, and the temperature of the lubricating oil is in a descending trend;
if Tn +1-T is more than or equal to 0 and T-Tn-1 is more than or equal to 0, Q is more than or equal to 0, and the temperature of the lubricating oil is in an increasing trend.
The invention has the advantages that: the invention can well improve the stability of the automatic control device for the temperature of the lubricating oil and the hysteresis response characteristic of the temperature of the lubricating oil. The method can be used as a temperature control design reference similar to the temperature control system of the lubricating oil in the ship power plant under the use environment.
Drawings
FIG. 1 is a flow chart of automatic control of oil temperature.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to fig. 1, when the lubricant temperature control is controlled manually: and operating the lubricating oil temperature adjusting and operating switch by an operator according to the temperature set value and the current temperature feedback value to enable the lubricating oil temperature to reach the set range. When the feedback value of the lubricating oil temperature is higher than the upper limit of the set range, the lubricating oil temperature regulation control switch is opened to an 'on' position, the opening degree of the lubricating oil temperature regulation valve is properly increased according to the deviation, the control switch is released to automatically return to a middle neutral position, the deviation between the feedback value of the lubricating oil temperature and the set value is observed after the feedback value of the lubricating oil temperature is reduced, and the process is repeated if the feedback value of the lubricating oil temperature is deviated. When the feedback value of the lubricating oil temperature is lower than the lower limit of the set range, the lubricating oil temperature regulating control switch is switched to an off position, the opening degree of the lubricating oil temperature regulating valve is properly closed according to the deviation, the control switch is released to automatically return to the neutral position, the deviation between the feedback value of the lubricating oil temperature and the set value is observed after the feedback value of the lubricating oil temperature is increased, and the process is repeated if the feedback value of the lubricating oil temperature is deviated. An important difference between the manual control and the automatic control is that even after the opening degree of the regulating valve is opened or closed, the manual control needs to wait for the change of the oil temperature to observe the change trend and then give an instruction, and the automatic control can continuously work as long as the oil temperature feedback value has a deviation from the set value.
Aiming at the problems in the automatic control of the lubricating oil temperature, the invention provides the following automatic control method of the lubricating oil temperature:
1) setting a target value of a PI controller as an optimum operating temperature TeThe optimum working range is set to [ A, B]When the feedback value of the lubricating oil temperature is in the interval, the adjustment is not needed, and Te∈[A，B]。
2) And when the temperature of the lubricating oil is lower than A, judging the current trend of the temperature change of the lubricating oil, and if the temperature of the lubricating oil is in the trend of reduction, starting the temperature control PI regulation of the lubricating oil. If the oil temperature is on an increasing trend, the current output is maintained. Until the oil temperature reaches the optimum operating range.
3) And when the temperature of the lubricating oil is higher than B, judging the current trend of the temperature change of the lubricating oil, and if the temperature of the lubricating oil is in the rising trend, starting the PI regulation of the temperature control of the lubricating oil. If the oil temperature is on a decreasing trend, the current output is maintained. Until the oil temperature reaches the optimum operating range.
The first of these aims to improve the stability of the automatic control device of the temperature of the lubricating oil. The second and third control methods are finer than the conventional ones, and aim to improve the hysteresis response characteristics of the lubricant temperature.
And setting the current lubricating oil temperature as T and the change trend as Q. The control of the oil temperature is performed according to the following logic strategy.
The temperature of the lubricating oil at the former moment is Tn-1, the current temperature of the lubricating oil is T, and the temperature of the lubricating oil at the latter moment is Tn + 1.
The calculation mode of the variation trend Q is as follows:
if Tn +1-T is less than or equal to 0 and T-Tn-1 is less than or equal to 0, Q is less than or equal to 0, and the lubricating oil temperature is considered to be in a descending trend; if Tn +1-T is greater than or equal to 0 and T-Tn-1 is greater than or equal to 0, then Q is greater than or equal to 0, and the lubricating oil temperature is considered to be in an increasing trend.
Claims (2)
1. A self-adaptive lubricating oil temperature control method is characterized by comprising the following steps:
1) setting the target value of the oil temperature PI controller as the optimal working temperature Te, setting the optimal working range as [ A, B ], and when the feedback value of the oil temperature is in the interval, without adjustment, Te belongs to [ A, B ];
2) when the temperature of the lubricating oil is lower than A, judging the current trend of the temperature change of the lubricating oil, if the temperature of the lubricating oil is in a decreasing trend, starting the temperature control PI regulation of the lubricating oil, and if the temperature of the lubricating oil is in an increasing trend, keeping the current output until the temperature of the lubricating oil reaches the optimal working range;
3) and when the temperature of the lubricating oil is higher than B, judging the current trend of the temperature change of the lubricating oil, starting the PI regulation of the temperature control of the lubricating oil if the temperature of the lubricating oil is in the rising trend, and keeping the current output until the temperature of the lubricating oil reaches the optimal working range if the temperature of the lubricating oil is in the falling trend.
2. The adaptive oil temperature control method according to claim 1, wherein:
the current lubricating oil temperature is T, the change trend is Q, and the lubricating oil temperature is controlled according to the following logic strategy:
the temperature of the lubricating oil at the former moment is Tn-1, the temperature of the current lubricating oil is T, the temperature of the lubricating oil at the latter moment is Tn +1,
the calculation mode of the variation trend Q is as follows:
if Tn +1-T is less than or equal to 0 and T-Tn-1 is less than or equal to 0, Q is less than or equal to 0, and the temperature of the lubricating oil is in a descending trend;
if Tn +1-T is more than or equal to 0 and T-Tn-1 is more than or equal to 0, Q is more than or equal to 0, and the temperature of the lubricating oil is in an increasing trend.
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| CN202110452144.0A CN113311886A (en) | 2021-04-26 | 2021-04-26 | Self-adaptive lubricating oil temperature control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113946171A (en) * | 2021-10-28 | 2022-01-18 | 歌尔光学科技有限公司 | Temperature control method, device, equipment and storage medium for double batteries |
| CN114594706A (en) * | 2022-02-07 | 2022-06-07 | 安徽聚源水利科技液压坝制造有限公司 | A kind of network control hinge dam and intelligent control system |
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| CN104340369A (en) * | 2013-07-24 | 2015-02-11 | 中国国际航空股份有限公司 | Performance monitoring method for aircraft auxiliary power unit lubricating oil cooler |
| CN106125546A (en) * | 2016-07-29 | 2016-11-16 | 重庆钢铁集团电子有限责任公司 | A kind of PID control method of the variation tendency applying controlled volume |
| CN112013523A (en) * | 2019-05-28 | 2020-12-01 | 麦克维尔空调制冷(武汉)有限公司 | Method and device for controlling temperature of frequency converter of refrigeration equipment and air conditioning system |
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2021
- 2021-04-26 CN CN202110452144.0A patent/CN113311886A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101154795A (en) * | 2006-09-29 | 2008-04-02 | 武汉楚天激光（集团）股份有限公司 | High-precision water cooling system and its control method |
| CN104340369A (en) * | 2013-07-24 | 2015-02-11 | 中国国际航空股份有限公司 | Performance monitoring method for aircraft auxiliary power unit lubricating oil cooler |
| CN106125546A (en) * | 2016-07-29 | 2016-11-16 | 重庆钢铁集团电子有限责任公司 | A kind of PID control method of the variation tendency applying controlled volume |
| CN112013523A (en) * | 2019-05-28 | 2020-12-01 | 麦克维尔空调制冷(武汉)有限公司 | Method and device for controlling temperature of frequency converter of refrigeration equipment and air conditioning system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113946171A (en) * | 2021-10-28 | 2022-01-18 | 歌尔光学科技有限公司 | Temperature control method, device, equipment and storage medium for double batteries |
| CN114594706A (en) * | 2022-02-07 | 2022-06-07 | 安徽聚源水利科技液压坝制造有限公司 | A kind of network control hinge dam and intelligent control system |
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