A method, device and system for controlling the temperature of lubricating oil in a transmission test bench

Abstract

The application provides a transmission test bench lubricating oil temperature control method, device and system. The transmission test bench lubricating oil temperature control method comprises the following steps: acquiring a preset gearbox lubricating oil temperature; acquiring a current gearbox lubricating oil temperature collected by a lubricating oil temperature sensor; generating a control signal according to the preset gearbox lubricating oil temperature and the current gearbox lubricating oil temperature; and sending the control signal to a lubricating oil temperature adjusting device, so that the lubricating oil temperature adjusting device adjusts the lubricating oil temperature according to the control signal. The transmission test bench lubricating oil temperature control method provided by the application realizes accurate automatic control of the automatic transmission oil temperature, and fills the test demand of the automatic transmission under low-temperature working conditions and specific oil temperature working conditions of low-load self-heating.

Description

Technical Field

[0001] This specification relates to the field of lubricating oil temperature control technology, and more particularly to a method, apparatus and system for lubricating oil temperature control on a transmission test bench. Background Technology

[0002] As the requirements for vehicle drivability and fuel economy gradually increase, the demands for precision in transmission bench testing and verification are also rising. Changes in transmission oil temperature lead to changes in lubricant viscosity, which in turn affects transmission efficiency and hydraulic system characteristics. Therefore, more precise control of oil temperature is required. Moreover, because lubricant viscosity is very high at low temperatures, it can easily cause fluctuations in hydraulic system performance and pressure shocks. Thus, there is also a strong need for testing under low-temperature conditions.

[0003] Currently, oil temperature control can be achieved in several ways. One way is to directly connect the circulating water to the oil cooler on the transmission to cool the transmission. However, this method can only cool the oil and not heat it. As a result, under certain operating conditions, such as when the load is low and the oil temperature requirement is high in efficiency tests, the transmission cannot reach the high-temperature test conditions due to insufficient heat generation.

[0004] Secondly, temperature control for automatic transmission testing is achieved through an oil temperature control unit. This method typically only maintains the oil temperature above 45℃, with a control accuracy generally limited to ±3℃, failing to meet the requirements for precise oil temperature control and low-temperature testing. Thirdly, an environmental chamber is used to cool the transmission, but this only controls the external ambient temperature of the transmission, indirectly controlling the lubricating oil temperature through heat exchange between the housing and cold air. This method is inefficient and inaccurate, and the oil temperature control is unstable during sample operation, making it difficult to achieve the required precision.

[0005] Therefore, it is desirable to have a technical solution to overcome or at least mitigate one of the aforementioned defects of the prior art. Summary of the Invention

[0006] In view of the above, the purpose of one or more embodiments of this specification is to provide a method, apparatus and system for controlling the temperature of lubricating oil on a transmission test bench, so as to solve at least one of the above problems.

[0007] To achieve the above objectives, one or more embodiments of this specification provide a method for controlling the temperature of lubricating oil on a transmission test bench, the method comprising:

[0008] Obtain the preset transmission fluid temperature;

[0009] Obtain the current transmission lubricating oil temperature collected by the lubricating oil temperature sensor;

[0010] A control signal is generated based on the preset transmission oil temperature and the current transmission oil temperature.

[0011] The control signal is sent to the lubricating oil temperature regulating device so that the lubricating oil temperature regulating device regulates the lubricating oil temperature according to the control signal.

[0012] Optionally, generating a control signal based on the preset transmission oil temperature and the current transmission oil temperature includes:

[0013] Determine whether the preset transmission fluid temperature is greater than the current transmission fluid temperature. If so, then...

[0014] Obtain the current temperature of the energy transfer medium as measured by the outlet temperature sensor;

[0015] Obtain the target temperature of the energy transfer medium;

[0016] Obtain the first control strategy;

[0017] A control signal is generated based on the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and the first control strategy.

[0018] Optionally, obtaining the target temperature of the energy transfer medium includes:

[0019] Obtain the heat transfer coefficient, heat transfer area, and heat load of the heat exchanger;

[0020] Obtain the current actual temperature of the lubricating oil;

[0021] The target temperature of the energy transfer medium is obtained based on the heat transfer coefficient, heat transfer area, heat load of the heat exchanger, and the actual temperature of the current lubricating oil.

[0022] Optionally, generating a control signal based on the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and the first control strategy includes:

[0023] Determine whether the current temperature of the energy transfer medium is lower than the target temperature of the energy transfer medium; if so, then

[0024] Generates an electric heating start control signal, and control signals for the first proportional valve and the second proportional valve.

[0025] Optionally, generating the control signal based on the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and the first control strategy further includes:

[0026] Determine whether the current temperature of the energy transfer medium is lower than the target temperature of the energy transfer medium; if not, then

[0027] Obtain the mass flow rate of the energy transfer medium;

[0028] The control signal for the second proportional valve is generated based on the mass flow rate of the energy transfer medium.

[0029] Optionally, the step of generating a control signal based on the preset transmission oil temperature and the current transmission oil temperature further includes:

[0030] Determine whether the preset transmission fluid temperature is greater than the current transmission fluid temperature; if not, then...

[0031] Obtain the current temperature of the energy transfer medium as measured by the outlet temperature sensor;

[0032] Obtain the target temperature of the energy transfer medium;

[0033] Obtain the second control strategy;

[0034] A control signal is generated based on the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and the second control strategy.

[0035] Optionally, generating a control signal based on the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and the second control strategy includes:

[0036] Determine whether the current temperature of the energy transfer medium is higher than the target temperature of the energy transfer medium; if so, then...

[0037] Generate the refrigeration start control signal, and the control signals for the first proportional valve and the second proportional valve.

[0038] On the other hand, this application also provides a transmission test bench lubricating oil temperature control device, the transmission test bench lubricating oil temperature control device comprising:

[0039] A preset transmission lubricating oil temperature acquisition module is used to acquire a preset transmission lubricating oil temperature.

[0040] A current transmission fluid temperature acquisition module is used to acquire the current transmission fluid temperature.

[0041] A control signal generation module is used to generate a control signal based on the preset transmission lubricating oil temperature and the current transmission lubricating oil temperature.

[0042] A sending module is used to send the control signal to the lubricating oil temperature regulation system, so that the lubricating oil temperature regulation system can regulate the lubricating oil temperature according to the control signal.

[0043] On the other hand, this application also provides a transmission test bench lubricating oil temperature control system, which includes: a lubricating oil temperature regulating device and the transmission test bench lubricating oil temperature control device as described above;

[0044] The lubricating oil temperature regulating device is connected to the lubricating oil in the gearbox through a lubricating oil pipeline, and is used to regulate the temperature of the lubricating oil in the gearbox according to the control signal sent by the lubricating oil temperature control device of the gearbox test bench.

[0045] Optionally, the lubricating oil temperature regulating device includes: an electric pump, a semiconductor cooler, an electric heater, a first proportional valve, an outlet temperature sensor, a flow sensor, a heat exchanger, a liquid storage tank, a second proportional valve, and an inlet temperature sensor;

[0046] The inlet of the electric pump is connected to one end of the storage tank and the outlet of the second proportional valve through a pipe, and the outlet of the electric pump is connected to the inlet of the semiconductor cooler and the inlet of the electric heater through a pipe.

[0047] The liquid outlet of the semiconductor cooler is connected to the first liquid inlet of the first proportional valve via a pipe.

[0048] The outlet of the electric heater is connected to the second inlet of the first proportional valve via a pipe.

[0049] The outlet of the first proportional valve is connected to both the first end of the outlet temperature sensor and the first inlet of the second proportional valve via a pipe.

[0050] The second end of the outlet temperature sensor is connected to the first end of the flow sensor via a pipe;

[0051] The second end of the flow sensor is connected to the first liquid inlet of the heat exchanger via a pipe.

[0052] The first liquid outlet of the heat exchanger is connected to the first end of the inlet temperature sensor via a pipe;

[0053] The second end of the inlet temperature sensor is connected to the second inlet of the second proportional valve via a pipe.

[0054] The second liquid outlet of the heat exchanger is connected to the lubricating oil outlet of the automatic transmission via a pipe;

[0055] The second liquid inlet of the heat exchanger is connected to the lubricating oil inlet of the automatic transmission via a pipe.

[0056] The beneficial effects of this application are as follows:

[0057] The transmission test bench lubricating oil temperature control method provided by this invention achieves precise automatic control of automatic transmission oil temperature, with a controllable oil temperature range of -5℃ to 115℃, filling the testing needs of automatic transmissions under low-temperature conditions and low-load self-heating conditions with insufficient oil temperature. Attached Figure Description

[0058] To more clearly illustrate the technical solutions in one or more embodiments of this specification or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one or more embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0059] Figure 1 A schematic flowchart of a method for controlling the temperature of lubricating oil on a transmission test bench, provided for one or more embodiments of this specification;

[0060] Figure 2 A schematic diagram of a lubricating oil temperature regulating device provided in one or more embodiments of this specification;

[0061] Figure 3 A more specific schematic diagram of an electronic device hardware structure provided for one or more embodiments of this specification;

[0062] Figure 4 This is a schematic diagram of a heat exchanger provided for one or more embodiments of this specification.

[0063] The annotations in the attached figures are explained as follows:

[0064] Electric pump 1, semiconductor cooler 2, electric heater 3, first proportional valve 4, outlet temperature sensor 5, flow sensor 6, liquid storage tank 7, heat exchanger 8, filter 9, second proportional valve 41, inlet temperature sensor 51, automatic transmission 10, first ball valve 71, second ball valve 72, third ball valve 73, fourth ball valve 74, fifth ball valve 75. Detailed Implementation

[0065] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0066] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0067] This application provides a lubricating oil temperature control system for a transmission test bench, including: a lubricating oil temperature regulating device and a lubricating oil temperature control device for a transmission test bench;

[0068] The lubricating oil temperature regulating device is connected to the lubricating oil in the transmission through the lubricating oil pipeline. It is used to regulate the temperature of the lubricating oil in the transmission according to the control signal sent by the lubricating oil temperature control device of the transmission test bench.

[0069] The following section, in conjunction with the accompanying drawings and the transmission test bench lubricating oil temperature control method, will describe in detail the specific working process of the transmission test bench lubricating oil temperature control system.

[0070] For example, the lubricating oil temperature control device on the transmission test bench is equipped with a smart700IE touch screen.

[0071] Reference Figure 2 In one embodiment, the lubricating oil temperature regulating device includes: an electric pump 1, a semiconductor cooler 2, an electric heater 3, a first proportional valve 4, an outlet temperature sensor 5, a flow sensor 6, a heat exchanger 8, a liquid storage tank 7, a second proportional valve 41, and an inlet temperature sensor 51.

[0072] The inlet of the electric pump 1 is connected to one end of the storage tank 7 and the outlet of the second proportional valve 41 through a pipe. The outlet of the electric pump 1 is connected to the inlet of the semiconductor cooler 2 and the inlet of the electric heater 3 through a pipe.

[0073] The liquid outlet of the semiconductor cooler 2 is connected to the first liquid inlet of the first proportional valve 4 via a pipe;

[0074] The outlet of the electric heater 3 is connected to the second inlet of the first proportional valve 4 via a pipe;

[0075] The outlet of the first proportional valve 4 is connected to the first end of the outlet temperature sensor 5 and the first inlet of the second proportional valve 41 through a pipe.

[0076] The second end of the outlet temperature sensor 5 is connected to the first end of the flow sensor 6 via a pipe.

[0077] The second end of the flow sensor 6 is connected to the first liquid inlet of the heat exchanger 8 via a pipe;

[0078] The first liquid outlet of the heat exchanger 8 is connected to the first end of the inlet temperature sensor 51 via a pipe;

[0079] The second end of the inlet temperature sensor 51 is connected to the second liquid inlet of the second proportional valve 41 via a pipe;

[0080] The second liquid outlet of the heat exchanger 8 is connected to the lubricating oil inlet of the automatic transmission 10 via a pipe;

[0081] The second liquid inlet of the heat exchanger 8 is connected to the lubricating oil outlet of the automatic transmission 10 via a pipe.

[0082] When the lubricating oil temperature regulating device is working, it contains an energy transfer medium. The energy transfer medium is cooled by the semiconductor cooler 2 and heated by the electric heater 3. The energy transfer medium is driven by the electric pump 1 to flow in the pipeline of the lubricating oil temperature regulating device. When it flows through the heat exchanger 8, it exchanges heat with the lubricating oil, thereby realizing the temperature regulation of the lubricating oil.

[0083] For example, the energy transfer medium can be automotive coolant.

[0084] Specifically, the first proportional valve 4 and the second proportional valve 41 are three-way proportional valves.

[0085] Reference Figure 2 In one embodiment, a filter 9, a first ball valve 71, and a second ball valve 72 are also provided between the first liquid outlet of the heat exchanger 8 and the first end of the inlet temperature sensor 51.

[0086] The first end of the filter 9 and the first end of the second ball valve 72 are connected to the first liquid outlet of the heat exchanger 8 through a pipe, and the second end of the filter 9 is connected to the first end of the first ball valve 71 through a pipe.

[0087] The second end of the first ball valve 71 and the second end of the second ball valve 72 are simultaneously connected to the first end of the inlet temperature sensor 51 via pipes.

[0088] Filter 9 filters the energy transfer medium to prevent impurities from forming during long-term use.

[0089] When the filter 9 is working normally, the first ball valve 71 is open and the second ball valve 72 is closed, and the energy transfer medium flows through the filter 9 and the first ball valve 71 in sequence.

[0090] When filter 9 becomes clogged or requires maintenance, the first ball valve 71 can be closed and the second ball valve 72 can be opened, allowing the energy transfer medium to flow through the second ball valve 72 to complete the cycle.

[0091] Reference Figure 2 In one embodiment, the lubricating oil temperature regulating device further includes: a third ball valve 73 and a fourth ball valve 74 disposed between the second end of the flow sensor 6 and the first liquid inlet of the heat exchanger 8;

[0092] One end of the fourth ball valve 74 is connected to the pipe between the first end of the flow sensor 6 and the second end of the outlet temperature sensor 5, and the other end is connected to the pipe between the second end of the inlet temperature sensor 51 and the second inlet of the second proportional valve 41.

[0093] The flow rate of the energy transfer medium flowing through the heat exchanger 8 is adjusted by the cooperation of the third ball valve 73 and the fourth ball valve 74. Adjustments are made according to specific conditions during different transmission tests. It is known that different transmissions require different types and amounts of lubricating oil.

[0094] On the other hand, the branch where the fourth ball valve 74 is located protects the branch where the heat exchanger 8 is located. Since the energy transfer medium flowing through both ends of the heat exchanger 8 will experience temperature changes, the temperature changes will cause changes in the volume of the energy transfer medium, and the changes in the volume of the energy transfer medium will cause changes in the pressure between the heat exchanger 8 and the electric pump 1. The branch where the fourth ball valve 74 is located can play a protective role.

[0095] Reference Figure 2 In one embodiment, the lubricating oil temperature regulating device further includes:

[0096] The fifth ball valve 75 is located on the pipeline between the outlet of the first proportional valve 4 and the first inlet of the second proportional valve 41.

[0097] By setting the fifth ball valve 75, the flow obstruction of the branch where the fifth ball valve 75 is located is adjusted.

[0098] In one embodiment, the lubricating oil temperature regulating device further includes: a first lubricating oil temperature sensor and a second lubricating oil temperature sensor;

[0099] The first lubricating oil temperature sensor is installed in the transmission oil pan to collect the actual temperature of the lubricating oil at the current moment (i.e., the temperature of the lubricating oil flowing into the heat exchanger 8).

[0100] The second lubricating oil temperature sensor is located on the pipe between the second liquid outlet of the heat exchanger 8 and the lubricating oil inlet of the automatic transmission 10.

[0101] In one embodiment, the lubricating oil temperature regulating device further includes: a PLC data processing module (not shown) and a DC programmable power supply (not shown);

[0102] The PLC data processing module includes an Ethernet communication unit, a serial communication unit, and an analog input unit;

[0103] The Ethernet communication unit is connected to the lubricating oil temperature control device on the transmission test bench;

[0104] The serial communication unit is connected to the control terminals of the semiconductor cooler 2, the electric heater 3, and the DC programmable power supply.

[0105] The analog input unit is connected to the outlet temperature sensor 5, the flow sensor 6, and the inlet temperature sensor 51;

[0106] The PLC data processing module is used to receive Ethernet signals sent by the lubricating oil temperature control device of the transmission test bench, process the signals, and then send them to other components.

[0107] The control terminal of the DC programmable power supply is connected to the serial communication unit of the PLC data processing module;

[0108] The power supply terminal of the DC programmable power supply is connected to the electric pump 1, the first proportional valve 4, and the second proportional valve 41, and is used to adjust the power supply of the electric pump 1, the first proportional valve 4, and the second proportional valve 41 according to the control signal sent by the serial communication unit of the PLC data processing module.

[0109] For example, the PLC data processing module can be a Siemens 200Smart.

[0110] Figure 1 This is a schematic flowchart of a method for controlling the temperature of lubricating oil on a transmission test bench, provided for one or more embodiments of this specification.

[0111] Reference Figure 1 This application provides a method for temperature control of lubricating oil on a transmission test bench, comprising:

[0112] Obtain the preset transmission fluid temperature;

[0113] Obtain the current transmission lubricating oil temperature collected by the lubricating oil temperature sensor;

[0114] A control signal is generated based on the preset transmission oil temperature and the current transmission oil temperature.

[0115] A control signal is sent to the lubricating oil temperature regulating device so that the lubricating oil temperature regulating device can regulate the lubricating oil temperature according to the control signal.

[0116] With the rapid development of the automotive industry, transmission bench testing has become a crucial part of product development and certification. Many product performance tests require low-temperature or specific oil temperature environments. Existing transmission temperature control devices, such as environmental chambers using compressor-cooled technology, control the transmission ambient temperature. However, the transmission generates heat during operation, making it impossible to control the transmission oil temperature. Circulating water temperature control units use electric pumps to circulate a room-temperature energy transfer medium (water or automotive coolant), cooling the transmission by controlling the flow and on / off of this medium. However, oil temperature control is inaccurate; the room-temperature energy transfer medium can only cool the oil to around 45°C, and it cannot heat the transmission oil under low-load, insufficient self-heating conditions. This invention provides a transmission test bench lubricating oil temperature control method that achieves precise automatic control of automatic transmission oil temperature, with a stable controllable oil temperature range of -5°C to 115°C, filling the testing needs of automatic transmissions under low-temperature conditions and low-load, insufficient self-heating conditions.

[0117] In one embodiment, generating a control signal based on a preset transmission fluid temperature and the current transmission fluid temperature includes:

[0118] Determine if the preset transmission fluid temperature is higher than the current transmission fluid temperature. If so, then...

[0119] Obtain the current temperature of the energy transfer medium as measured by the outlet temperature sensor;

[0120] Obtain the target temperature of the energy transfer medium;

[0121] Obtain the first control strategy;

[0122] A control signal is generated based on the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and the first control strategy.

[0123] In one embodiment, obtaining the target temperature of the energy transfer medium includes:

[0124] Obtain the heat transfer coefficient, heat transfer area, and heat load of the heat exchanger;

[0125] Obtain the current actual temperature of the lubricating oil;

[0126] The target temperature of the energy transfer medium is obtained based on the heat transfer coefficient, heat transfer area, heat load, and the actual temperature of the current lubricating oil of the heat exchanger.

[0127] For example, the target temperature of the energy transfer medium is obtained using the following formula:

[0128] The target temperature of the energy transfer medium, Tliquid: Tliquid = 2Δtm - Toil;

[0129] Where T represents the current temperature of the lubricating oil, and △tm represents the average temperature difference between the two fluids, in °C. △tm is obtained by referring to the following formula.

[0130] From Q = KF * Δtm, we can derive Δtm = Q / KF;

[0131] Wherein, K represents the average heat transfer coefficient on the entire heat transfer surface, and the unit is W / (㎡*℃);

[0132] F represents the heat transfer area, in square meters (m²).

[0133] Q represents the heat load of the heat exchanger, measured in kJ / h or kW.

[0134] In one embodiment, generating a control signal based on the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and a first control strategy includes:

[0135] Determine if the current temperature of the energy transfer medium is lower than the target temperature of the energy transfer medium; if so, then...

[0136] Generates an electric heating start control signal, and control signals for the first proportional valve and the second proportional valve.

[0137] For example, refer to Figure 4 The mass flow rate of the energy transfer medium is obtained using the following formula:

[0138] Q=Wh(Hh1-Hh2)=Wc(Hc2-Hc1);

[0139] In the formula, Q is the heat load of the heat exchanger, kJ / h or kW;

[0140] Wh is the mass flow rate of the energy transfer medium, Hh1 represents the enthalpy of the energy transfer medium per unit mass at the heat exchanger inlet, and Hh2 represents the enthalpy of the energy transfer medium per unit mass at the heat exchanger outlet.

[0141] Wc represents the mass flow rate of the lubricating oil, Hc2 represents the enthalpy of the lubricating oil per unit mass at the heat exchanger outlet, and Hc1 represents the enthalpy of the lubricating oil per unit mass at the heat exchanger inlet.

[0142] The outlet temperature sensor 5 collects the temperature t1 of the energy transfer medium at the heat exchanger inlet.

[0143] Inlet temperature sensor 51 collects the temperature t1′ of the energy transfer medium at the heat exchanger outlet.

[0144] The first lubricating oil temperature sensor collects the lubricating oil temperature t2 at the heat exchanger inlet.

[0145] The second lubricating oil temperature sensor collects the lubricating oil temperature t2′ at the heat exchanger outlet.

[0146] The enthalpy of the energy transfer medium per unit mass at the heat exchanger inlet, the enthalpy of the energy transfer medium per unit mass at the heat exchanger outlet, the enthalpy of the lubricating oil per unit mass at the heat exchanger outlet, and the enthalpy of the lubricating oil per unit mass at the heat exchanger inlet are obtained by looking up a table based on the temperature. The enthalpy of each fluid at different temperatures is known. In one embodiment, generating the control signal based on the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and the first control strategy further includes:

[0147] Determine if the current temperature of the energy transfer medium is lower than the target temperature of the energy transfer medium; if not, then

[0148] Obtain the mass flow rate of the energy transfer medium;

[0149] The control signal for the second proportional valve is generated based on the mass flow rate of the energy transfer medium.

[0150] It is worth noting that the mass flow rate mentioned here refers to the mass flow rate at the current moment.

[0151] In one embodiment, generating a control signal based on a preset transmission fluid temperature and the current transmission fluid temperature further includes:

[0152] Determine if the preset transmission fluid temperature is higher than the current transmission fluid temperature. If not, then...

[0153] Obtain the current temperature of the energy transfer medium as measured by the outlet temperature sensor;

[0154] Obtain the target temperature of the energy transfer medium;

[0155] Obtain the second control strategy;

[0156] A control signal is generated based on the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and the second control strategy.

[0157] In one embodiment, generating a control signal based on the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and a second control strategy includes:

[0158] Determine if the current temperature of the energy transfer medium is higher than the target temperature of the energy transfer medium; if so, then...

[0159] Generate the refrigeration start control signal, and the control signals for the first proportional valve and the second proportional valve.

[0160] In one embodiment, generating the control signal based on the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and the second control strategy further includes:

[0161] Determine if the current temperature of the energy transfer medium is higher than the target temperature of the energy transfer medium; if not, then

[0162] Obtain the mass flow rate of the energy transfer medium;

[0163] The control signal for the second proportional valve is generated based on the mass flow rate of the energy transfer medium.

[0164] It is worth noting that the mass flow rate mentioned here refers to the mass flow rate at the current moment.

[0165] The following examples further illustrate this application in detail. It is understood that these examples do not constitute any limitation on this application.

[0166] Before using this device, connect the second liquid inlet of the heat exchanger 8 to the lubricating oil inlet of the automatic transmission 10 via a pipe, and connect the second liquid inlet of the heat exchanger 8 to the lubricating oil outlet of the automatic transmission 10 via a pipe. This allows the lubricating oil in the automatic transmission 10 to flow through the heat exchanger 8 to form a circulation loop.

[0167] Obtain the preset transmission fluid temperature;

[0168] Obtain the current transmission lubricating oil temperature collected by the lubricating oil temperature sensor;

[0169] Determine if the preset transmission fluid temperature is higher than the current transmission fluid temperature. If so, then...

[0170] Obtain the current temperature of the energy transfer medium as measured by the outlet temperature sensor;

[0171] The target temperature of the energy transfer medium can be obtained, specifically, it can be calculated using the formula above.

[0172] Determine if the current temperature of the energy transfer medium is lower than the target temperature of the energy transfer medium; if so, then...

[0173] Generate an electric heating start control signal, and control signals for the first and second proportional valves; for example, refer to Figure 2 At this time, the energy transfer medium flows through electric pump 1, electric heater 3, first proportional valve 4, second proportional valve 41 and finally returns to electric pump 1. The storage tank is used to replenish the insufficient liquid in the circulation pipeline and does not participate in the circulation.

[0174] During this process, the electric heater 3 heats the circulating energy transfer medium in the pipeline, and the energy transfer medium absorbs the heat.

[0175] Determine if the current temperature of the energy transfer medium is lower than the target temperature of the energy transfer medium; if not, then

[0176] To obtain the mass flow rate of the energy transfer medium, the mass flow rate of the energy transfer medium refers to the mass flow rate at the current moment, which is obtained by referring to the formula above.

[0177] The control signal for the second proportional valve is generated based on the mass flow rate of the energy transfer medium.

[0178] At this point, the energy transfer medium sequentially passes through electric pump 1, electric heater 3 and / or semiconductor cooler 2 (at this time, electric heater 3 and semiconductor cooler 2 are not working), first proportional valve 4, part of which flows through fifth ball valve 75 to second proportional valve 41; part of which flows through fourth ball valve 74 to second proportional valve 41, and the remaining part sequentially passes through flow sensor 6, third ball valve 73, heat exchanger 8, filter 9, first ball valve 71 to second proportional valve 41; finally, it flows into electric pump 1. The storage tank is used to replenish the insufficient amount in the circulation pipeline and does not participate in the circulation.

[0179] For example, generating a control signal for the second proportional valve based on the mass flow rate of the energy transfer medium includes the following steps:

[0180] A target mass flow rate database for the energy transfer medium is obtained. This database includes the target mass flow rates of multiple energy transfer media and the difference between the preset transmission lubricating oil temperature and the current transmission lubricating oil temperature corresponding to the target mass flow rate of each energy transfer medium. The target mass flow rate of the energy transfer medium is directly proportional to the difference between the preset and current transmission lubricating oil temperatures; that is, the larger the difference between the preset and current transmission lubricating oil temperatures, the larger the target mass flow rate of the energy transfer medium. For example, when the difference between the preset and current transmission lubricating oil temperatures is 5°C, the target mass flow rate of the energy transfer medium is 2 kg / h; when the difference is 10°C, the target mass flow rate of the energy transfer medium is 4 kg / h.

[0181] Obtain the current transmission lubricating oil temperature collected by the lubricating oil temperature sensor;

[0182] Obtain the preset transmission fluid temperature;

[0183] The target mass flow rate of the energy transfer medium is generated based on the current transmission oil temperature, the preset transmission oil temperature, and the target mass flow rate database of the energy transfer medium.

[0184] The control ratio database of the second proportional valve is obtained. The control ratio database of the second proportional valve includes the control ratio of multiple second proportional valves and the difference between the target mass flow rate and the current mass flow rate of the energy transfer medium corresponding to the control ratio of each second proportional valve (the current mass flow rate is calculated by the flow rate m1 obtained by the flow sensor 6; the calculation of flow rate and mass flow rate is existing technology and will not be elaborated here). For example, if the difference between the target mass flow rate and the current mass flow rate of the energy transfer medium is 5 kg / h, the control ratio of the second proportional valve is that the energy transfer medium flowing into the first inlet (corresponding to the branch where the heat exchanger 8 is located) accounts for 30% of the energy transfer medium flowing out of the outlet, and the energy transfer medium flowing into the second inlet accounts for 70% of the energy transfer medium flowing out of the outlet; if the difference between the target mass flow rate and the current mass flow rate of the energy transfer medium is 10 kg / h, the control ratio of the second proportional valve is that the energy transfer medium flowing into the first inlet (corresponding to the branch where the heat exchanger 8 is located) accounts for 50% of the energy transfer medium flowing out of the outlet, and the energy transfer medium flowing into the second inlet accounts for 50% of the energy transfer medium flowing out of the outlet.

[0185] It is known that the data in the control ratio database of the second proportional valve and the target mass flow rate database of the energy transfer medium can be set according to the gearbox and lubricating oil.

[0186] The absolute value of the difference between the preset transmission fluid temperature and the current transmission fluid temperature is always positive.

[0187] The absolute value of the difference between the target mass flow rate and the current mass flow rate of the energy transfer medium is always positive.

[0188] The control signal for the second proportional valve is generated based on the target mass flow rate of the energy transfer medium, the current mass flow rate of the energy transfer medium, and the control ratio database of the second proportional valve.

[0189] Determine if the preset transmission fluid temperature is higher than the current transmission fluid temperature. If not, then...

[0190] Obtain the current temperature of the energy transfer medium as measured by the outlet temperature sensor;

[0191] Determine if the current temperature of the energy transfer medium is higher than the target temperature of the energy transfer medium; if so, then...

[0192] Generates a cooling start control signal, and control signals for the first and second proportional valves. For example, refer to... Figure 2 At this time, the energy transfer medium flows through electric pump 1, semiconductor cooler 2, first proportional valve 4, second proportional valve 41 and finally returns to electric pump 1. The liquid storage tank is used to replenish the insufficient liquid in the circulation pipeline and does not participate in the circulation.

[0193] During this process, the semiconductor cooler 2 cools the circulating energy transfer medium in the pipeline, and the energy transfer medium releases heat.

[0194] Determine if the current temperature of the energy transfer medium is higher than the target temperature of the energy transfer medium; if not, then

[0195] To obtain the mass flow rate of the energy transfer medium, the mass flow rate of the energy transfer medium refers to the mass flow rate at the current moment, which is obtained by referring to the formula above.

[0196] The control signal for the second proportional valve is generated based on the mass flow rate of the energy transfer medium.

[0197] At this point, the energy transfer medium sequentially passes through electric pump 1, electric heater 3 and / or semiconductor cooler 2 (at this time, electric heater 3 and semiconductor cooler 2 are not working), first proportional valve 4, part of which flows through fifth ball valve 75 to second proportional valve 41; part of which flows through fourth ball valve 74 to second proportional valve 41, and the remaining part sequentially passes through flow sensor 6, third ball valve 73, heat exchanger 8, filter 9, first ball valve 71 to second proportional valve 41; finally, it flows into electric pump 1. The storage tank is used to replenish the insufficient amount in the circulation pipeline and does not participate in the circulation.

[0198] For example, generating a control signal for the second proportional valve based on the mass flow rate of the energy transfer medium includes the following steps:

[0199] Obtain the target mass flow rate database of the energy transfer medium. The target mass flow rate database of the energy transfer medium is the same as that mentioned above, so it will not be described in detail here.

[0200] Obtain the current transmission lubricating oil temperature collected by the lubricating oil temperature sensor;

[0201] Obtain the preset transmission fluid temperature;

[0202] The target mass flow rate of the energy transfer medium is generated based on the current transmission oil temperature, the preset transmission oil temperature, and the target mass flow rate database of the energy transfer medium.

[0203] Obtain the control proportional database of the second proportional valve. The control proportional database of the second proportional valve here is the same as that described above, so it will not be described in detail again.

[0204] The control signal for the second proportional valve is generated based on the target mass flow rate of the energy transfer medium, the current mass flow rate of the energy transfer medium, and the control ratio database of the second proportional valve.

[0205] On one hand, the transmission test bench lubricating oil temperature control device provided in this application includes:

[0206] A preset transmission fluid temperature acquisition module is used to acquire a preset transmission fluid temperature.

[0207] The current transmission oil temperature acquisition module is used to acquire the current transmission oil temperature.

[0208] The control signal generation module is used to generate control signals based on the preset transmission lubricating oil temperature and the current transmission lubricating oil temperature.

[0209] The sending module is used to send control signals to the lubricating oil temperature regulation system so that the lubricating oil temperature regulation system can regulate the lubricating oil temperature according to the control signals.

[0210] It should be noted that the methods of one or more embodiments of this specification can be executed by a single device, such as a computer or server. The methods of this embodiment can also be applied in a distributed scenario, where multiple devices cooperate to complete the task. In such a distributed scenario, one of these devices may execute only one or more steps of the methods of one or more embodiments of this specification, and these multiple devices will interact with each other to complete the described method for controlling the lubricating oil temperature on a transmission test bench.

[0211] The foregoing has described specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired result. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0212] Figure 3 This embodiment illustrates a more specific hardware structure of an electronic device, which may include a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, memory 1020, input / output interface 1030, and communication interface 1040 are interconnected internally via the bus 1050.

[0213] The processor 1010 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the transmission test bench lubricating oil temperature control method provided in the embodiments of this specification.

[0214] The memory 1020 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage device, dynamic storage device, etc. The memory 1020 can store the operating system and other applications. When the technical solutions provided in the embodiments of this specification are implemented by software or firmware, the relevant program code is stored in the memory 1020 and is called and executed by the processor 1010.

[0215] The input / output interface 1030 is used to connect input / output modules to realize information input and output. Input / output modules can be configured as components within the device (not shown in the figure) or externally connected to the device to provide corresponding functions. Input devices may include keyboards, mice, touchscreens, microphones, various sensors, etc., while output devices may include displays, speakers, vibrators, indicator lights, etc.

[0216] The communication interface 1040 is used to connect a communication module (not shown in the figure) to enable communication between this device and other devices. The communication module can communicate via wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.).

[0217] Bus 1050 includes a pathway for transmitting information between various components of the device, such as processor 1010, memory 1020, input / output interface 1030, and communication interface 1040.

[0218] It should be noted that although the above-described device only shows the processor 1010, memory 1020, input / output interface 1030, communication interface 1040, and bus 1050, in specific implementations, the device may also include other components necessary for normal operation. Furthermore, those skilled in the art will understand that the above-described device may only include the components necessary for implementing the embodiments of this specification, and not necessarily all the components shown in the figures.

[0219] One embodiment of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the above-described method for controlling the lubricating oil temperature on a transmission test bench.

[0220] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transfer medium that can be used to store information accessible by a computing device.

[0221] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this disclosure, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of one or more embodiments of this specification as described above, which are not provided in detail for the sake of brevity.

[0222] Additionally, to simplify the description and discussion, and to avoid obscuring one or more embodiments of this specification, well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. Furthermore, the apparatus may be illustrated in block diagram form to avoid obscuring one or more embodiments of this specification, and this also takes into account the fact that the details of implementation of these block diagram apparatuses are highly dependent on the platform on which one or more embodiments of this specification will be implemented (i.e., these details should be fully understood by those skilled in the art). While specific details (e.g., circuits) have been set forth to describe exemplary embodiments of this disclosure, it will be apparent to those skilled in the art that one or more embodiments of this specification may be implemented without these specific details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0223] Although this disclosure has been described in conjunction with specific embodiments thereof, many substitutions, modifications, and variations of these embodiments will be apparent to those skilled in the art from the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0224] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of this disclosure.

Claims

1. A method of controlling the temperature of lubricating oil in a transmission test bench, characterized by, The transmission test bench lubricating oil temperature control method comprises the following steps: obtaining a preset transmission lubricating oil temperature; obtaining a current transmission lubricating oil temperature collected by a lubricating oil temperature sensor; generating a control signal according to the preset transmission lubricating oil temperature and the current transmission lubricating oil temperature; sending the control signal to a lubricating oil temperature adjusting device, so that the lubricating oil temperature adjusting device adjusts the lubricating oil temperature according to the control signal; wherein the lubricating oil temperature adjusting device comprises an electric pump, a semiconductor refrigerator, an electric heater, a first proportional valve, an outlet temperature sensor, a flow sensor, a heat exchanger, a liquid storage tank, a second proportional valve, and an inlet temperature sensor; the liquid inlet of the electric pump is connected to one end of the liquid storage tank and the liquid outlet of the second proportional valve through a pipeline; the liquid outlet of the electric pump is connected to the liquid inlet of the semiconductor refrigerator and the liquid inlet of the electric heater through a pipeline; the liquid outlet of the semiconductor refrigerator is connected to the first liquid inlet of the first proportional valve through a pipeline; the liquid outlet of the electric heater is connected to the second liquid inlet of the first proportional valve through a pipeline; the liquid outlet of the first proportional valve is connected to the first end of the outlet temperature sensor and the first liquid inlet of the second proportional valve through a pipeline; the second end of the outlet temperature sensor is connected to the first end of the flow sensor through a pipeline; the second end of the flow sensor is connected to the first liquid inlet of the heat exchanger through a pipeline; the first liquid outlet of the heat exchanger is connected to the first end of the inlet temperature sensor through a pipeline; the second end of the inlet temperature sensor is connected to the second liquid inlet of the second proportional valve through a pipeline; the second liquid outlet of the heat exchanger is connected to the lubricating oil outlet of the transmission through a pipeline; the second liquid inlet of the heat exchanger is connected to the lubricating oil inlet of the transmission through a pipeline; the control signal is generated according to the preset transmission lubricating oil temperature and the current transmission lubricating oil temperature, which comprises the following steps: determining whether the preset transmission lubricating oil temperature is greater than the current transmission lubricating oil temperature, if yes, then obtaining the current temperature of the energy transfer medium measured by the outlet temperature sensor; obtaining the target temperature of the energy transfer medium; obtaining a first control strategy; generating a control signal according to the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and the first control strategy; generating the control signal according to the target temperature of the energy transfer medium, the current temperature of the energy transfer medium, and the first control strategy comprises the following steps: determining whether the current temperature of the energy transfer medium is lower than the target temperature of the energy transfer medium; if not, obtaining the mass flow of the energy transfer medium; generating a control signal of the second proportional valve according to the mass flow of the energy transfer medium; if yes, generating an electric heating opening control signal, a control signal of the first proportional valve, and a control signal of the second proportional valve; the target temperature of the energy transfer medium is determined according to the following formula: Tliquid = 2△tm - Toil Wherein, T oil represents the current moment temperature of lubricating oil, and △tm represents the average temperature difference between the two fluids, with unit of ℃, which is obtained by referring to the following formula; △tm = Q / KF is derived from Q = KF*△tm; Wherein, K represents the average heat transfer coefficient on the whole heat transfer surface, with unit of W / (㎡*℃); F represents the heat transfer area, with unit of ㎡; and Q represents the heat load of the heat exchanger, with unit of kj / h or kw; The mass flow of the energy transfer medium is obtained by referring to the following formula: Q = Wh(Hh1 - Hh2) = Wc(Hc2 - Hc1); In the formula, Q represents the heat load of the heat exchanger; Wh represents the mass flow of the energy transfer medium; Hh1 represents the enthalpy of the energy transfer medium per unit mass at the inlet of the heat exchanger; Hh2 represents the enthalpy of the energy transfer medium per unit mass at the outlet of the heat exchanger; Wc represents the mass flow of the lubricating oil; Hc2 represents the enthalpy of the lubricating oil per unit mass at the outlet of the heat exchanger; Hc1 represents the enthalpy of the lubricating oil per unit mass at the inlet of the heat exchanger; t1 represents the temperature of the energy transfer medium at the inlet of the heat exchanger collected by the outlet temperature sensor; t1' represents the temperature of the energy transfer medium at the outlet of the heat exchanger collected by the inlet temperature sensor; t2 represents the temperature of the lubricating oil at the inlet of the heat exchanger collected by the first lubricating oil temperature sensor; and t2' represents the temperature of the lubricating oil at the outlet of the heat exchanger collected by the second lubricating oil temperature sensor.

2. The transmission test stand lube oil temperature control method of claim 1 wherein, The target temperature of the energy transfer medium is obtained by: Obtaining the heat transfer coefficient, heat transfer area and heat load of the heat exchanger; Obtaining the actual temperature of the current lubricating oil; Obtaining the target temperature of the energy transfer medium according to the heat transfer coefficient, heat transfer area, heat load of the heat exchanger and the actual temperature of the current lubricating oil.

3. The transmission test bench lubricating oil temperature control method of claim 2, wherein, Generating the control signal according to the target temperature of the energy transfer medium, the current temperature of the energy transfer medium and the first control strategy comprises: Determining whether the current temperature of the energy transfer medium is lower than the target temperature of the energy transfer medium; if yes, then Generating the control signal of the electric heating opening, the first proportional valve and the second proportional valve.

4. The transmission test bench lubricating oil temperature control method of claim 3, wherein, The generating the control signal according to the preset transmission lubricating oil temperature and the current moment transmission lubricating oil temperature further comprises: Determining whether the preset transmission lubricating oil temperature is greater than the current moment transmission lubricating oil temperature; if no, then Obtaining the second control strategy; Generating the control signal according to the target temperature of the energy transfer medium, the current temperature of the energy transfer medium and the second control strategy.

5. The transmission test bench lubricating oil temperature control method of claim 4, wherein, The generating the control signal according to the target temperature of the energy transfer medium, the current temperature of the energy transfer medium and the second control strategy comprises: Determining whether the current temperature of the energy transfer medium is higher than the target temperature of the energy transfer medium; if yes, then Generating the control signal of the refrigeration opening, the first proportional valve and the second proportional valve.

6. A temperature control device for a transmission test bench lubricating oil, characterized in that, The transmission test bench lubricating oil temperature control device for executing the method of any one of claims 1-5 comprises: a preset transmission lubricating oil temperature acquisition module, configured to acquire a preset transmission lubricating oil temperature; a current time transmission lubricating oil temperature acquisition module, configured to acquire a current time transmission lubricating oil temperature; a control signal generation module, configured to generate a control signal according to the preset transmission lubricating oil temperature and the current time transmission lubricating oil temperature; a sending module, configured to send the control signal to a lubricating oil temperature adjusting system, so that the lubricating oil temperature adjusting system adjusts the lubricating oil temperature according to the control signal.

7. A transmission test bench lubricating oil temperature control system characterized by, The transmission test bench lubricating oil temperature control system comprises a lubricating oil temperature adjusting device and the transmission test bench lubricating oil temperature control device according to claim 6. The lubricating oil temperature adjusting device is connected to the lubricating oil in the transmission through a lubricating oil pipeline, and is configured to adjust the temperature of the lubricating oil in the transmission according to the control signal sent by the transmission test bench lubricating oil temperature control device.

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