CN-116857265-B - Hydraulic oil preheating method and system and engineering machinery

CN116857265BCN 116857265 BCN116857265 BCN 116857265BCN-116857265-B

Abstract

The application relates to the technical field of engineering machinery, in particular to a hydraulic oil preheating method and system and engineering machinery. The method comprises the steps of obtaining the hydraulic oil temperature of hydraulic oil in a hydraulic system, and adjusting one or more parameters of the hydraulic oil pressure, the displacement of an oil pump and the rotating speed of an engine of the hydraulic system until the hydraulic oil temperature rises to a working temperature range according to the fact that the hydraulic oil temperature is lower than a preset oil temperature. When the hydraulic oil temperature is lower than the preset oil temperature, the situation that the hydraulic oil is poor and cannot be put into operation at the moment is indicated, and timely preheating is needed. One or more parameters selected from the hydraulic oil pressure, the oil pump displacement and the engine speed are adjusted and increased, so that the hydraulic oil obtains enough energy content. In the method, an additional heater is not needed, and internal energy in the hydraulic system is converted into heat energy so as to preheat the hydraulic oil, so that the preheating of the hydraulic oil is realized at lower cost.

Inventors

LI BO
ZHOU LIYUN
Deng Dingquan

Assignees

湖南三一中型起重机械有限公司

Dates

Publication Date: 20260508
Application Date: 20230531

Claims (8)

1. A hydraulic oil preheating method, characterized by comprising: Acquiring hydraulic oil temperature of hydraulic oil in hydraulic system, and When the hydraulic oil temperature accords with a first preset temperature range, controlling the hydraulic oil pressure of the hydraulic system to be increased and then keeping the hydraulic oil pressure to be preset oil pressure, controlling the displacement of the oil pump to be increased and then keeping the displacement of the oil pump to be second preset displacement, and controlling the engine speed to be increased to a target speed according to three speed gradients which are increased in sequence; when the hydraulic oil temperature accords with a second preset temperature range, controlling the hydraulic oil pressure to be kept at the preset oil pressure, controlling the displacement to be kept at the second preset displacement after being increased, controlling the engine speed to be increased to the target speed according to two speed gradients which are sequentially increased, and When the hydraulic oil temperature accords with a third preset temperature range, controlling the hydraulic oil pressure to be kept as the preset oil pressure, controlling the displacement to be kept as the second preset displacement, and controlling the engine rotating speed to be kept as the target rotating speed; Wherein the minimum value of the third preset temperature range is larger than the maximum value of the second preset temperature range, and the minimum value of the second preset temperature range is larger than the maximum value of the first preset temperature range; The method further comprises the steps of generating heating reminding information when the hydraulic oil temperature accords with the first preset temperature range, the second preset temperature range or the third preset temperature range after the hydraulic oil temperature of the hydraulic oil in the hydraulic system is obtained, and And receiving heating confirmation information input by a user according to the heating reminding information.
2. The method for preheating hydraulic oil according to claim 1, wherein when the hydraulic oil temperature meets a first preset temperature range, controlling the hydraulic oil pressure of the hydraulic system to be increased and then kept at a preset oil pressure, controlling the displacement of the oil pump to be increased and then kept at a second preset displacement, and controlling the engine speed to be increased to a target speed according to three speed gradients sequentially increasing comprises: controlling the hydraulic oil pressure to be linearly increased to the preset oil pressure, controlling the displacement to be linearly increased to a first preset displacement, and controlling the engine rotating speed to be kept at a first rotating speed value in a first time period; controlling the hydraulic oil pressure to be kept at the preset oil pressure, controlling the displacement to be linearly increased from the first preset displacement to the second preset displacement, controlling the engine speed to be kept at a second speed value in a second period of time, and In a third time period, controlling the hydraulic oil pressure to be kept at the preset oil pressure, controlling the displacement to be kept at the second preset displacement, and controlling the engine rotating speed to be kept at a third rotating speed value; wherein the third rotational speed value is greater than the second rotational speed value, which is greater than the first rotational speed value.
3. The hydraulic oil warm-up method according to claim 1, wherein when the hydraulic oil temperature meets a second preset temperature range, controlling the hydraulic oil pressure to be kept at the preset oil pressure, controlling the displacement to be kept at the second preset displacement after being increased, controlling the engine speed to be increased to the target speed in two rotational speed gradients that are sequentially increased includes: Controlling the hydraulic oil pressure to be kept at the preset oil pressure, controlling the displacement to be linearly increased from the first preset displacement to the second preset displacement, controlling the engine speed to be kept at a second speed value in a second period of time, and In a third time period, controlling the hydraulic oil pressure to be kept at the preset oil pressure, controlling the displacement to be kept at the second preset displacement, and controlling the engine rotating speed to be kept at a third rotating speed value; Wherein the third rotational speed value is greater than the second rotational speed value.
4. The hydraulic oil warm-up method according to claim 1, wherein when the hydraulic oil temperature meets a third preset temperature range, controlling the hydraulic oil pressure to be kept at the preset oil pressure, controlling the displacement to be kept at the second preset displacement, and controlling the engine speed to be kept at the target speed includes: And in a third time period, controlling the hydraulic oil pressure to be kept at the preset oil pressure, controlling the displacement to be kept at the second preset displacement, and controlling the engine rotating speed to be kept at a third rotating speed value.
5. The hydraulic oil warm-up method according to claim 1, wherein the obtaining the hydraulic oil temperature of the hydraulic oil in the hydraulic system includes: acquiring a temperature sampling value detected by a temperature sensor in the hydraulic system, and And obtaining the hydraulic oil temperature according to the temperature sampling value.
6. The hydraulic oil warm-up method according to any one of claims 1 to 5, characterized by further comprising: And stopping executing the hydraulic oil preheating method when the heating stopping information input by the user is received.
7. A hydraulic oil preheating system, characterized by comprising: The oil temperature acquisition module is configured to acquire the hydraulic oil temperature of hydraulic oil in the hydraulic system; The preheating control module is in communication connection with the oil temperature acquisition module and is configured to adjust one or more parameters of hydraulic oil pressure, displacement of an oil pump and engine rotation speed of the hydraulic system according to the fact that the hydraulic oil temperature is lower than a preset oil temperature until the hydraulic oil temperature rises to a working temperature range, wherein the preheating control module comprises the steps of controlling the hydraulic oil pressure of the hydraulic system to be kept at preset oil pressure after the hydraulic oil temperature accords with a first preset temperature range, controlling the displacement of the oil pump to be kept at second preset displacement after the hydraulic oil pressure increases, controlling the engine rotation speed to rise to a target rotation speed according to three rotation speed gradients which are sequentially increased, controlling the hydraulic oil pressure to be kept at preset oil pressure after the hydraulic oil temperature accords with a second preset temperature range, controlling the hydraulic oil pressure to be kept at the preset oil pressure when the hydraulic oil temperature accords with a third preset temperature range, controlling the displacement to be kept at the second preset oil pressure, controlling the hydraulic oil pressure to be kept at the second preset displacement, controlling the engine rotation speed to be gradually increased to be increased to a target rotation speed, controlling the hydraulic oil pressure to be kept at the maximum value in the first preset temperature range, controlling the hydraulic oil temperature range to be kept at the maximum value after the hydraulic oil temperature accords with the first preset temperature range, controlling the hydraulic oil temperature to be kept at the maximum value in the first preset temperature range, controlling the hydraulic oil temperature range to be at the maximum value, and obtaining the maximum value of the hydraulic oil temperature in the hydraulic oil temperature range after the hydraulic oil temperature reaches the first preset temperature range, and the maximum value, generating heating reminding information and receiving heating confirmation information input by a user according to the heating reminding information.
8. A construction machine, comprising: A construction machine body; A hydraulic system arranged on the engineering machinery body, and The hydraulic oil pre-heating system according to claim 7, which is electrically connected to the hydraulic system.

Description

Hydraulic oil preheating method and system and engineering machinery Technical Field The application relates to the technical field of engineering machinery, in particular to a hydraulic oil preheating method and system and engineering machinery. Background When various engineering machines such as a wheel crane are started at low temperature in winter, the response of the boarding action is slow due to wax precipitation of hydraulic oil caused by poor low-temperature fluidity and evaporation property of the hydraulic oil. The existing solution is to fill hydraulic oil with different grades according to temperature change, namely high grade hydraulic oil is adopted in low temperature season, but compared with low grade hydraulic oil, the high grade hydraulic oil has lower durability, higher price and greatly increased use cost. In the solution, operators cannot respond to temperature changes accurately in time, and high-grade and low-grade hydraulic oil is often mixed, so that incomplete atomization of the hydraulic oil is caused, and a plurality of defects of main action are caused. Yet another solution is to add additional heating means in the hydraulic system, by means of which the hydraulic oil is heated, which is not efficient and increases costs. To sum up, the existing hydraulic oil heating scheme has the problems of high cost and low efficiency. How to solve the technical problem that how to realize the preheating of hydraulic oil with lower cost and higher efficiency in the current engineering machinery is needed to be solved in the field. Disclosure of Invention In view of the above, the present application provides a hydraulic oil preheating method capable of realizing preheating of hydraulic oil at lower cost and higher efficiency. In a first aspect, the hydraulic oil preheating method comprises the steps of obtaining the hydraulic oil temperature of hydraulic oil in a hydraulic system, and adjusting one or more parameters of the hydraulic oil pressure, the displacement of an oil pump and the rotating speed of an engine of the hydraulic system until the hydraulic oil temperature rises to a working temperature range according to the fact that the hydraulic oil temperature is lower than a preset oil temperature. In this aspect, the oil pump is one or more electrically controlled pumps in the hydraulic system for providing flow power to the hydraulic oil in the hydraulic system. When the hydraulic oil temperature is lower than the preset oil temperature, the situation that the hydraulic oil is poor and cannot be put into operation at the moment is indicated, and timely preheating is needed. One or more parameters selected from the hydraulic oil pressure, the oil pump displacement and the engine speed are adjusted and increased, so that the hydraulic oil obtains enough energy content. In the method, an additional heater is not needed, and internal energy in the hydraulic system is converted into heat energy so as to preheat the hydraulic oil, so that the preheating of the hydraulic oil is realized at lower cost. With reference to the first aspect, in a possible implementation manner, the adjusting one or more parameters of the hydraulic oil pressure of the hydraulic system, the displacement of the oil pump and the engine speed according to the hydraulic oil temperature being lower than a preset oil temperature until the hydraulic oil temperature rises to a working temperature range includes controlling the hydraulic oil pressure of the hydraulic system to keep at a preset oil pressure after the hydraulic oil temperature conforms to a first preset temperature range, controlling the displacement of the oil pump to keep at a second preset displacement after the hydraulic oil pressure increases, controlling the engine speed to rise to a target speed according to three speed gradients sequentially increasing, controlling the hydraulic oil pressure to keep at the preset oil pressure after the hydraulic oil temperature conforms to a second preset temperature range, controlling the engine speed to keep at the second preset displacement after the hydraulic oil temperature conforms to a second preset temperature range, controlling the hydraulic oil pressure to keep at the second preset oil pressure when the hydraulic oil pressure conforms to a third preset temperature range, controlling the displacement to keep at the second preset displacement, and controlling the engine speed to keep at the target speed, wherein the second preset speed is smaller than a first preset temperature range, and the first preset speed is larger than the maximum value of the first preset temperature range. With reference to the first aspect, in a possible implementation manner, when the hydraulic oil temperature accords with a first preset temperature range, the hydraulic oil pressure of the hydraulic system is controlled to be kept at a preset oil pressure after being increased, the displacement of the oil pump is controlled to be