Engine oil temperature control device and automobile

Abstract

The utility model provides an engine oil temperature control device and an automobile, and belongs to the technical field of engines, the control device comprises an oil pan radiator, an electromagnetic valve and an engine oil temperature controller; the oil pan radiator is arranged on the surface of the engine oil pan; an outlet of the oil pan radiator is communicated with an exhaust tail pipe of a whole vehicle, and an inlet of the oil pan radiator is communicated with an outlet of a post-processing system used for processing engine exhaust through the electromagnetic valve. And the engine oil temperature controller is used for outputting a control signal to control the on-off of the electromagnetic valve. The engine oil temperature controller outputs a control signal to control the on-off of the electromagnetic valve, so that the on-off between the post-processing system and the oil pan radiator is realized, the exhaust trend is controlled, the exhaust energy is effectively utilized to improve or maintain the engine oil temperature, and the engine oil temperature is improved. Therefore, the technical problem that according to an existing engine warming-up scheme, the fuel economy of the whole vehicle is low is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a control device for engine oil temperature and a vehicle. Background Art

[0002] Existing engine warm-up processes typically accelerate by increasing engine load to provide more heat for raising oil temperature. While this solution meets the need for rapid engine warm-up, the increased engine load reduces vehicle fuel economy and is often accompanied by abnormal engine vibration and noise in low-temperature environments. Utility Model Content

[0003] In view of this, it is necessary to provide an engine oil temperature control device and a vehicle to solve the technical problem of low vehicle fuel economy in existing engine warm-up solutions.

[0004] In order to solve the above problems, on the one hand, the utility model provides an engine oil temperature control device, comprising: an oil pan radiator, a solenoid valve, and an oil temperature controller;

[0005] The oil pan radiator is arranged on the surface of the oil pan;

[0006] The outlet of the oil pan radiator is connected to the exhaust tail pipe of the vehicle, and the inlet of the oil pan radiator is connected to the outlet of the after-treatment system for treating engine exhaust through the solenoid valve;

[0007] The oil temperature controller is used to output a control signal to control the on and off of the solenoid valve.

[0008] In a possible implementation, the oil sump radiator is tubular in shape.

[0009] In a possible implementation, the solenoid valve is a duty cycle solenoid valve.

[0010] In a possible implementation, the oil temperature controller includes:

[0011] The first comparison circuit is used to output a control signal for controlling the solenoid valve to be turned on when the engine coolant temperature or the engine oil temperature is lower than the first temperature threshold and the vehicle speed is lower than the first speed threshold after the engine is started.

[0012] In a possible implementation, the oil temperature controller further includes:

[0013] The second comparison circuit is used to output a control signal for controlling the solenoid valve to be disconnected when the engine coolant temperature or the engine oil temperature is higher than a second temperature threshold, or the vehicle speed is higher than a second vehicle speed threshold.

[0014] In a possible implementation, the oil temperature controller further includes:

[0015] The third comparison circuit is used to output a control signal for controlling the solenoid valve to be turned on when the vehicle enters a coasting mode and there is a need for auxiliary braking, and the engine coolant temperature or the oil temperature is lower than a third temperature threshold while the vehicle is driving.

[0016] In a possible implementation, the oil temperature controller further includes:

[0017] The fourth comparison circuit is used to output a control signal for controlling the solenoid valve to be turned on after the vehicle has finished traveling and the vehicle speed is lower than a third vehicle speed threshold.

[0018] On the other hand, the present invention further provides an automobile, comprising: the engine oil temperature control device described in any one of the above items.

[0019] In one possible implementation, the automobile also includes: an engine, which is connected to the oil pan and the after-treatment system through pipes respectively, the pipe between the engine and the oil pan is used for oil circulation, and the pipe between the engine and the after-treatment system is used for exhaust circulation.

[0020] In a possible implementation, the automobile further includes: a vehicle exhaust tail pipe, which is further connected to an inlet of an oil pan radiator via a solenoid valve.

[0021] The beneficial effects of the above implementation are as follows: the present invention provides an engine oil temperature control device and a vehicle, the engine oil temperature control device comprising: an oil pan radiator, a solenoid valve, and an oil temperature controller; the oil pan radiator being disposed on the surface of the engine oil pan; the outlet of the oil pan radiator being connected to the vehicle exhaust tailpipe, and the inlet of the oil pan radiator being connected to the outlet of an after-treatment system for treating engine exhaust via the solenoid valve; and the oil temperature controller being configured to output a control signal to control the on / off switching of the solenoid valve. In engine warm-up, driving, auxiliary braking, and shutdown modes, the solenoid valve is controlled to connect or disconnect the after-treatment system and the oil pan radiator, thereby controlling the exhaust flow and effectively utilizing exhaust energy to increase or maintain the oil temperature, thereby achieving the engine oil temperature increase and insulation requirements in different application scenarios, such as engine cooling, shutdown, and vehicle coasting. This solution does not increase engine load, provides more heat to increase the oil temperature, and accelerates the engine warm-up process, thereby resolving the technical problem of low vehicle fuel economy associated with existing engine warm-up solutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a structural schematic diagram of an embodiment of an engine oil temperature control device provided by the utility model. DETAILED DESCRIPTION

[0024] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0025] In the description of the embodiments of the present application, unless otherwise specified, “a plurality of” means two or more.

[0026] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or device comprising a series of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules that are not explicitly listed or are inherent to these processes, methods, products or devices.

[0027] The naming or numbering of the steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0028] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0029] The utility model provides an engine oil temperature control device and a vehicle, which are respectively described below.

[0030] like Figure 1 As shown, the present invention provides an engine oil temperature control device, comprising: an oil pan radiator 104, a solenoid valve, and an oil temperature controller 106;

[0031] The oil pan radiator 104 is arranged on the surface of the oil pan 103;

[0032] The outlet of the oil pan radiator 104 is connected to the exhaust tail pipe 107 of the vehicle, and the inlet of the oil pan radiator 104 is connected to the outlet of the after-treatment system 102 for treating the exhaust of the engine 101 through the solenoid valve;

[0033] The oil temperature controller 106 is used to output a control signal to control the on / off of the solenoid valve.

[0034] The oil sump is the lower half of the crankcase, also known as the lower crankcase. Its function is to seal the crankcase, which acts as an oil reservoir, preventing the ingress of impurities. It also collects and stores lubricating oil that flows back from the engine's friction surfaces, dissipating some of the heat and preventing oxidation.

[0035] The motor oil usually refers to the general term for three types of lubricants: engine oil, vehicle gear oil (MT) and hydraulic transmission oil (AT). Only hydraulic transmission oil requires an external oil cooler (what you call an oil radiator) for forced cooling, because the hydraulic transmission oil working in the automatic transmission needs to play the three roles of hydraulic torque conversion, hydraulic transmission and lubrication and cleaning at the same time. The operating temperature of the hydraulic transmission oil is relatively high. If it is not forced to cool, it may cause transmission burning. Therefore, the role of the oil cooler is to cool the hydraulic transmission oil to ensure that the automatic transmission can work normally.

[0036] Radiators (also known as oil coolers) can be categorized by cooling method: water-cooled or air-cooled. Water cooling involves directing coolant from the engine 101 cooling system circuit to an oil cooler mounted on the automatic transmission for cooling, or directing hydraulic fluid to the lower water chamber of the engine 101 cooling system radiator for cooling. Air cooling involves directing hydraulic fluid to an oil cooler mounted on the windward side of the front grille for cooling.

[0037] The solenoid valve contains a sealed chamber with holes at different locations. Each hole is connected to a different oil pipe. A piston is located in the center of the chamber, and two electromagnets are located on either side. The valve body is attracted to the side where the magnet coil is energized. By controlling the movement of the valve body, different oil drain holes are opened or closed. The oil inlet hole is normally open, allowing hydraulic oil to enter different oil drain pipes. The oil pressure then pushes the piston of the oil cylinder, which in turn drives the piston rod, which in turn drives the mechanical device. In this way, mechanical movement is controlled by controlling the current flowing through the electromagnet.

[0038] Solenoid valves are divided into three categories based on principle: direct-acting solenoid valves, step-by-step direct-acting solenoid valves and pilot-operated solenoid valves.

[0039] Direct-acting solenoid valve:

[0040] Principle: When power is on, the electromagnetic coil generates electromagnetic force to lift the closing piece from the valve seat, and the valve opens; when power is off, the electromagnetic force disappears, the spring presses the closing piece onto the valve seat, and the valve closes.

[0041] Features: It can work normally under vacuum, negative pressure and zero pressure, but the diameter generally does not exceed 25mm.

[0042] Step-by-step direct-acting solenoid valve:

[0043] Principle: It is a combination of direct-acting and pilot-operated valves. When there is no pressure differential between the inlet and outlet, upon power-on, the electromagnetic force directly lifts the pilot valve and the main valve closure member upward in sequence, opening the valve. When the inlet and outlet pressure differential reaches the starting pressure, upon power-on, the electromagnetic force pilots the small valve, causing the pressure in the lower chamber of the main valve to rise and the pressure in the upper chamber to drop, thereby using the pressure differential to push the main valve upward. When power is off, the pilot valve uses spring force or medium pressure to push the closure member downward, closing the valve.

[0044] Features: It can also operate under zero pressure difference, vacuum or high pressure, but the power is relatively large and it must be installed horizontally.

[0045] Pilot operated solenoid valve:

[0046] Principle: When power is on, the electromagnetic force opens the pilot hole, the pressure in the upper chamber drops rapidly, and a pressure difference with lower upper part and higher lower part is formed around the closing part. The fluid pressure pushes the closing part upward and the valve opens. When power is off, the spring force closes the pilot hole, and the inlet pressure quickly passes through the bypass hole to the chamber, forming a pressure difference with lower lower part and higher upper part around the closing part. The fluid pressure pushes the closing part downward and closes the valve.

[0047] Features: The upper limit of the fluid pressure range is relatively high and can be installed arbitrarily (customization is required) but the fluid pressure difference conditions must be met.

[0048] Solenoid valves are divided into six subcategories based on the differences in valve structure, materials and principles: direct-acting diaphragm structure, step-by-step direct-acting diaphragm structure, pilot diaphragm structure, direct-acting piston structure, step-by-step direct-acting piston structure, and pilot piston structure.

[0049] Solenoid valves are classified according to their functions: water solenoid valves, steam solenoid valves, refrigeration solenoid valves, low-temperature solenoid valves, gas solenoid valves, fire solenoid valves, ammonia solenoid valves, gas solenoid valves, liquid solenoid valves, miniature solenoid valves, pulse solenoid valves, hydraulic solenoid valves, normally open solenoid valves, oil solenoid valves, DC solenoid valves, high-pressure solenoid valves, explosion-proof solenoid valves, etc.

[0050] The utility model designs an engine oil temperature control device, which lays a layer of tubular radiator on the surface of the engine oil pan, and realizes optimized intervention control of the engine oil temperature by controlling the exhaust direction in the engine 101 hot engine, driving, auxiliary braking and shutdown modes.

[0051] The engine oil temperature control device provided by the present invention switches the exhaust direction of the engine 101 in the warm-up, driving, auxiliary braking, and shutdown modes, and effectively utilizes the exhaust energy to increase or maintain the oil temperature.

[0052] Under the premise of no significant cost increase, the engine oil temperature control device provided by the present invention can maximize the use of exhaust energy to maintain the temperature of the engine 101, thereby reducing system energy consumption.

[0053] In some embodiments, the oil sump radiator 104 is tubular in shape.

[0054] It is understandable that the shape of the oil pan radiator 104 can be a regular tubular shape or an irregular tubular shape, and the cross-sectional diameter of any part of the tubular shape is the same. There is flowing coolant inside the tubular shape of the oil pan radiator 104.

[0055] In some embodiments, the solenoid valve is a duty cycle solenoid valve 105 .

[0056] It's understandable that a duty-cycle solenoid valve primarily consists of key components, including the electromagnet, magnetic core, and valve core. The electromagnet is the core component of the solenoid valve, and its operating principle is that when powered, the surrounding magnetic field attracts the core inside the electromagnet, thereby changing the channel state within the valve body.

[0057] The magnetic core is an important component in the solenoid valve, which can concentrate the magnetic force. When the electromagnet is energized, the magnetic field inside the core will generate a certain magnetic force, which will attract the valve core in the valve body and change the state of the channel.

[0058] The valve core is another key component of the solenoid valve. Its operating principle is as follows: when the electromagnet is energized, the magnetic force causes the valve core to move, changing the state of the passage. When the electromagnet is de-energized, the valve core rebounds to its original position, restoring the passage's state.

[0059] Duty-cycle solenoid valves also require a duty-cycle controller (in this embodiment, this could be the oil temperature controller 106 ) for control. The duty-cycle controller adjusts the channel state and flow rate based on the solenoid valve's actual needs by controlling the solenoid valve's switching frequency and duration, thereby achieving precise control.

[0060] In summary, the operating principle of a duty-cycle solenoid valve is to change channel state and flow through the collaboration of key components such as the electromagnet, magnetic core, and valve core, and to precisely control this through a duty-cycle controller. Understanding these principles can help us better select and use solenoid valves based on actual needs and also provide some assistance with solenoid valve maintenance.

[0061] In some embodiments, the oil temperature controller 106 includes:

[0062] The first comparison circuit is used to output a control signal for controlling the solenoid valve to be turned on when the engine 101 is started and the coolant temperature or oil temperature of the engine 101 is lower than the first temperature threshold and the vehicle speed is lower than the first speed threshold.

[0063] It is understood that once the first comparison circuit receives the voltage signal corresponding to engine start completion, it can determine that the engine start is complete. A comparison circuit, also known as a comparator, operates by comparing two or more data items to determine their equality, or to determine their magnitude relationship and order. A circuit or device capable of performing this comparison function is called a comparator. A comparator compares an analog voltage signal with a reference voltage. Its two inputs are analog signals, and its output is a binary signal of 0 or 1. When the difference in the input voltages increases or decreases without changing its sign, the output remains constant.

[0064] A comparator is similar to a 1-bit analog-to-digital converter (ADC). While an operational amplifier can theoretically be used as a comparator without negative feedback, due to its very high open-loop gain, it can only process signals with very small input differential voltages. Furthermore, op amps generally have long delay times, which may not meet practical requirements. Comparators can be adjusted to provide extremely small delays, but this limits their frequency response. To prevent output oscillation, many comparators also include internal hysteresis. Comparator thresholds are fixed, with some having only one threshold and others having two.

[0065] In some embodiments, the oil temperature controller 106 further includes:

[0066] The second comparison circuit is used to output a control signal for controlling the solenoid valve to be disconnected when the coolant temperature or the oil temperature of the engine 101 is higher than a second temperature threshold, or the vehicle speed is higher than a second vehicle speed threshold.

[0067] It is understandable that the structure of the second comparison circuit is similar to that of the first comparison circuit, but the analog voltage and the reference voltage may be different from those of the first comparison circuit.

[0068] In some embodiments, the oil temperature controller 106 further includes:

[0069] The third comparison circuit is used to output a control signal for controlling the solenoid valve to be turned on when the vehicle enters the coasting mode and there is a need for auxiliary braking, and the coolant temperature or oil temperature of the engine 101 is lower than the third temperature threshold while the vehicle is driving.

[0070] It is understandable that after the third comparison circuit receives the voltage signal corresponding to the vehicle entering the coasting mode and having the auxiliary braking requirement, it can determine that the vehicle has entered the coasting mode and has the auxiliary braking requirement.

[0071] In some embodiments, the oil temperature controller 106 further includes:

[0072] The fourth comparison circuit is used to output a control signal for controlling the solenoid valve to be turned on after the vehicle has finished traveling and the vehicle speed is lower than a third vehicle speed threshold.

[0073] It is understood that after the fourth comparison circuit receives the voltage signal corresponding to the end of vehicle travel, it can determine that the vehicle has ended travel. The first temperature threshold, the second temperature threshold, and the third temperature threshold can all be the same, or they can all be different, or only any two of them can be the same. Similarly, the first vehicle speed threshold, the second vehicle speed threshold, and the third vehicle speed threshold can all be the same, or they can all be different, or only any two of them can be the same.

[0074] In some embodiments, a tubular oil pan radiator 104 is laid flat on the surface of the engine oil pan, and the heat dissipation pipe inlet of the oil pan radiator 104 is connected to the vehicle exhaust tail pipe 107 through a duty cycle solenoid valve 105, and the outlet of the vehicle exhaust tail pipe 107 is connected to the atmosphere.

[0075] After the engine 101 is started, when the coolant temperature or oil temperature of the engine 101 is lower than a certain limit (a first temperature threshold) and the vehicle speed is lower than a certain limit (a first speed threshold), the oil temperature controller 106 sends a control instruction to the duty cycle solenoid valve 105 to connect the exhaust of the after-treatment system 102 and the oil pan radiator 104, using the residual heat of the vehicle exhaust to heat the oil pan, thereby accelerating the warm-up process.

[0076] When the coolant temperature or oil temperature of the engine 101 is higher than a certain limit (a second temperature threshold) or the vehicle speed is higher than a certain limit (a second vehicle speed threshold), the oil temperature controller 106 disconnects the exhaust of the after-treatment system 102 and the oil pan radiator 104 through the duty cycle solenoid valve 105 to prevent excessive exhaust back pressure from affecting the vehicle power output.

[0077] When the vehicle enters coasting mode and there is a need for assisted braking during driving, when the coolant temperature or oil temperature of the engine 101 is lower than a certain limit (the third temperature threshold), the exhaust of the after-treatment system 102 and the oil pan radiator 104 are connected through the duty cycle solenoid valve 105, and the residual heat of the vehicle exhaust is used to heat the oil pan and maintain the temperature. At the same time, the vehicle deceleration is assisted by increasing the exhaust resistance.

[0078] After the trip is completed and the vehicle speed is again lower than a certain limit (the third speed threshold), the duty cycle solenoid valve 105 connects the exhaust of the after-treatment system 102 and the oil pan radiator 104 and maintains the connection until the engine 101 stops. The residual heat of the exhaust gas flowing through the cooling pipe slows down the cooling process of the engine oil, which is beneficial to the next start of the engine 101.

[0079] In summary, the engine oil temperature control device provided by the present invention includes: an oil pan radiator 104, a solenoid valve, and an oil temperature controller 106; the oil pan radiator 104 is arranged on the surface of the oil pan 103; the outlet of the oil pan radiator 104 is connected to the exhaust tail pipe 107 of the whole vehicle, and the inlet of the oil pan radiator 104 is connected to the outlet of the after-treatment system 102 for treating the exhaust of the engine 101 through the solenoid valve; the oil temperature controller 106 is used to output a control signal to control the on and off of the solenoid valve. In the engine 101 hot engine, driving, auxiliary braking, and shutdown modes, the connection or disconnection between the after-treatment system 102 and the oil pan radiator 104 is achieved by controlling the on and off of the solenoid valve, thereby controlling the direction of the exhaust gas, effectively utilizing the exhaust gas energy to increase or maintain the oil temperature, and achieving the engine oil heating and insulation requirements in different application scenarios of engine 101 cold engine, shutdown, and vehicle coasting. This solution does not require increasing the load on the engine 101, but provides more heat for increasing the oil temperature, thereby accelerating the warm-up process of the engine 101, thereby solving the technical problem of low vehicle fuel economy in the existing engine 101 warm-up solution.

[0080] The engine oil temperature control device provided by the utility model has the following beneficial effects:

[0081] 1. No complex mechanical structure is required. The radiator pipeline and duty cycle solenoid valve 105 with mature applications are used in combination with the control strategy to achieve the engine oil heating and insulation requirements in different application scenarios such as engine 101 cooling, shutdown, and vehicle coasting.

[0082] 2. The engine oil temperature control device provided by the utility model has flexible layout, simple control logic and low manufacturing cost.

[0083] The utility model also provides an automobile, comprising: the above-mentioned engine oil temperature control device.

[0084] It is understandable that the car in this embodiment refers to a car that needs to be installed with the engine 101 , which can be a traditional gasoline car or a hybrid new energy car equipped with the engine 101 .

[0085] In some embodiments, the automobile further includes: an engine 101, the engine 101 being connected to an oil pan 103 and an after-treatment system 102 through pipes, respectively; the pipe between the engine 101 and the oil pan 103 is used for oil circulation, and the pipe between the engine 101 and the after-treatment system 102 is used for exhaust circulation.

[0086] In some embodiments, the automobile further includes: a vehicle exhaust tail pipe 107 , and the vehicle exhaust tail pipe 107 is further connected to the inlet of the oil pan radiator 104 through a solenoid valve 105 .

[0087] In summary, the automobile provided by the present invention includes an engine oil temperature control device, which includes: an oil pan radiator 104, a solenoid valve, and an oil temperature controller 106; the oil pan radiator 104 is arranged on the surface of the oil pan 103; the outlet of the oil pan radiator 104 is connected to the exhaust tail pipe 107 of the entire vehicle, and the inlet of the oil pan radiator 104 is connected to the outlet of the after-treatment system 102 for treating the exhaust of the engine 101 through the solenoid valve; the oil temperature controller 106 is used to output a control signal to control the on and off of the solenoid valve. In the engine 101 hot engine, driving, auxiliary braking, and shutdown modes, the connection or disconnection between the after-treatment system 102 and the oil pan radiator 104 is achieved by controlling the on and off of the solenoid valve, thereby controlling the direction of the exhaust gas, effectively utilizing the exhaust gas energy to increase or maintain the oil temperature, and achieving the engine oil heating and insulation requirements in different application scenarios of engine 101 cold engine, shutdown, and vehicle coasting. This solution does not require increasing the load on the engine 101, but provides more heat for increasing the oil temperature, thereby accelerating the warm-up process of the engine 101, thereby solving the technical problem of low vehicle fuel economy in the existing engine 101 warm-up solution.

[0088] The above is a detailed introduction to the engine oil temperature control device and automobile provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, based on the idea of ​​the present invention, there may be changes in the specific implementation methods and application scope. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A device for controlling engine oil temperature, characterized in that: include: Oil pan radiator, solenoid valve, oil temperature controller; The oil pan radiator is arranged on the surface of the oil pan; The outlet of the oil pan radiator is connected to the exhaust tail pipe of the vehicle, and the inlet of the oil pan radiator is connected to the outlet of the after-treatment system for treating engine exhaust through the solenoid valve; The oil temperature controller is used to output a control signal to control the on and off of the solenoid valve.

2. The engine oil temperature control device according to claim 1, characterized in that: The oil pan radiator is in a tubular shape.

3. The engine oil temperature control device according to claim 1, characterized in that: The solenoid valve is a duty cycle solenoid valve.

4. The engine oil temperature control device according to claim 1, characterized in that: The oil temperature controller comprises: The first comparison circuit is used to output a control signal for controlling the solenoid valve to be turned on when the engine coolant temperature or the engine oil temperature is lower than the first temperature threshold and the vehicle speed is lower than the first speed threshold after the engine is started.

5. The engine oil temperature control device according to claim 4, characterized in that: The oil temperature controller further includes: The second comparison circuit is used to output a control signal for controlling the solenoid valve to be disconnected when the engine coolant temperature or the engine oil temperature is higher than a second temperature threshold, or the vehicle speed is higher than a second vehicle speed threshold.

6. The engine oil temperature control device according to claim 4, characterized in that: The oil temperature controller further includes: The third comparison circuit is used to output a control signal for controlling the solenoid valve to be turned on when the vehicle enters a coasting mode and there is a need for auxiliary braking, and the engine coolant temperature or the oil temperature is lower than a third temperature threshold while the vehicle is driving.

7. The engine oil temperature control device according to claim 4, characterized in that: The oil temperature controller further includes: The fourth comparison circuit is used to output a control signal for controlling the solenoid valve to be turned on after the vehicle has finished traveling and the vehicle speed is lower than a third vehicle speed threshold.

8. An automobile, characterized in that: include: The engine oil temperature control device according to any one of claims 1 to 7.

9. The automobile according to claim 8, characterized in that Also includes: The engine is connected to the oil pan and the after-treatment system through pipelines, the pipeline between the engine and the oil pan is used for oil circulation, and the pipeline between the engine and the after-treatment system is used for exhaust circulation.

10. The automobile according to claim 8, characterized in that Also includes: The exhaust tail pipe of the whole vehicle is also connected to the inlet of the oil pan radiator through a solenoid valve.

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