Engine control system, engine control method, and engine control program

Abstract

An engine control system, an engine control method, and an engine control program. The engine control system according to the present disclosure is provided with an oil temperature sensor and a wastegate valve control section. The oil temperature sensor detects the temperature of engine oil. The wastegate valve control section controls the opening and closing of a wastegate valve (WGV) based on the temperature of engine oil detected by the oil temperature sensor. More specifically, in the case where the temperature of engine oil detected by the oil temperature sensor is below a predetermined threshold value, the wastegate valve control section controls in such a manner that the wastegate valve (WGV) is opened.

Description

Technical Field

[0001] This disclosure relates to engine control systems, engine control methods, and engine control programs. Background Technology

[0002] Japanese Patent Application Publication No. 2008-014289 discloses an engine control device that controls the opening and closing of an on / off valve that bypasses a turbocharger passage located in the engine's exhaust path. The engine control device disclosed in Japanese Patent Application Publication No. 2008-014289 forcibly closes the on / off valve when a high probability of vehicle acceleration is detected.

[0003] Furthermore, the on / off valve described in Japanese Patent Application Publication No. 2008-014289 is generally referred to as an exhaust gas bypass valve, and in this specification, it will also be referred to as an exhaust gas bypass valve. When the exhaust gas bypass valve is closed, the turbocharger operates. Summary of the Invention

[0004] The engine control device described in Japanese Patent Application Publication No. 2008-014289 forcibly closes the exhaust gas bypass valve before the engine requires the torque necessary to operate the turbocharger, when the likelihood of vehicle acceleration is high. This configuration extends the turbocharger's operating time.

[0005] If the turbocharger operates for a longer period of time, the engine oil deteriorates more quickly. Therefore, in the engine control device described in Japanese Patent Application Publication No. 2008-014289, there is a problem of accelerated engine oil deterioration.

[0006] This disclosure was made to solve such a problem, and its purpose is to provide an engine control system, engine control method and engine control program that can suppress the deterioration of engine oil.

[0007] The engine control system disclosed herein includes an oil temperature sensor and an exhaust gas bypass valve control unit.

[0008] The oil temperature sensor detects the temperature of the engine oil.

[0009] The exhaust gas bypass valve control unit controls the opening and closing of the exhaust gas bypass valve based on the engine oil temperature detected by the oil temperature sensor.

[0010] When the engine oil temperature detected by the oil temperature sensor is below a predetermined threshold, the exhaust gas bypass valve control unit controls the exhaust gas bypass valve to open.

[0011] The lower the engine oil temperature, the easier it is for it to absorb substances that cause oil degradation. Therefore, if the exhaust bypass valve is opened when the engine oil temperature is low, the amount of substances that cause oil degradation absorbed by the engine oil can be reduced, thereby inhibiting engine oil degradation.

[0012] It could be the engine control system mentioned above.

[0013] It also includes a torque calculation unit that calculates the required torque for the engine based on the amount of time the accelerator pedal is depressed.

[0014] When the required torque is above a predetermined threshold, the exhaust gas bypass valve control unit controls the exhaust gas bypass valve to close, regardless of the engine oil temperature.

[0015] If configured in this way, the engine's responsiveness will be improved.

[0016] It could be the engine control system mentioned above.

[0017] It also features a water temperature sensor that detects the temperature of the engine's coolant.

[0018] When the temperature of the cooling water detected by the water temperature sensor is below a predetermined threshold, the exhaust gas bypass valve control unit controls the exhaust gas bypass valve to open.

[0019] Since there is a correlation between the engine coolant temperature and the engine oil temperature, this configuration can better inhibit the deterioration of the engine oil.

[0020] The engine control method disclosed herein involves a solution.

[0021] Check the engine oil temperature;

[0022] The opening and closing of the exhaust bypass valve is controlled based on the detected engine oil temperature.

[0023] The system controls the opening of the exhaust bypass valve when the detected engine oil temperature is below a predetermined threshold.

[0024] The engine control program disclosed herein causes the computer to perform the following actions:

[0025] Check the engine oil temperature;

[0026] The opening and closing of the exhaust bypass valve is controlled based on the detected engine oil temperature.

[0027] The system controls the opening of the exhaust bypass valve when the detected engine oil temperature is below a predetermined threshold.

[0028] According to this disclosure, an engine control system, an engine control method, and an engine control program that can suppress the deterioration of engine oil can be provided.

[0029] The above and other objects, features and advantages of this disclosure will be more fully understood from the detailed description and accompanying drawings given below, which are given by way of example only and should not be considered as limiting the disclosure. Attached Figure Description

[0030] Figure 1 This is a schematic diagram showing the configuration of an engine system equipped with a turbocharger.

[0031] Figure 2 This is a block diagram showing the configuration of the engine control system according to the first embodiment.

[0032] Figure 3 This is a flowchart illustrating the operation of the engine control system according to the first embodiment.

[0033] Figure 4 This is a block diagram showing the configuration of the engine control system according to the second embodiment.

[0034] Figure 5 This is a flowchart illustrating the operation of the engine control system according to the second embodiment. Detailed Implementation

[0035] (The mechanism by which the research topic arose)

[0036] <Engine System Composition>

[0037] The mechanism by which the subject matter arises in this disclosure will be explained in detail. First, the composition of the engine system that generates the subject matter will be explained in detail. Figure 1 This is a schematic diagram showing the configuration of an engine system equipped with a turbocharger.

[0038] As a major component, the engine system 1 includes an engine E, a throttle valve TH, a blow-by valve PCV (Positive Crankcase Ventilation), an intake manifold IM, an exhaust manifold EM, an intake passage E1, an exhaust passage E2, a blow-by exhaust passage E3, a turbocharger TC, a bypass passage BP, and an exhaust bypass valve WGV.

[0039] Engine E is, for example, an internal combustion engine that uses gasoline or similar fuel. Engine E mixes and combusts the air and fuel supplied from the intake manifold IM to produce driving force. Engine E discharges the exhaust gas produced by combustion into exhaust passage E2. In addition, engine E discharges blow-by gas into blow-by exhaust passage E3.

[0040] Here, blow-by gas refers to unburned gas and gas mixture that leaks into the crankcase through the gap between the cylinder and piston of engine E.

[0041] The blow-by air discharged from engine E passes through blow-by exhaust passage E3 and merges with the air passing through intake manifold IM. Then it is supplied to engine E again.

[0042] Air is supplied to engine system 1 via intake passage E1 and intake manifold IM. More specifically, the air supplied from intake passage E1 flows through turbocharger TC to intake manifold IM and is supplied to engine E. In addition, the air supplied via intake manifold IM includes blow-by air supplied from blow-by exhaust passage E3.

[0043] Exhaust gas from engine system 1 exits through exhaust passage E2. More specifically, exhaust gas from engine E exits through turbocharger TC or bypass passage BP and exits through exhaust manifold EM.

[0044] The blow-by valve (PCV) is a valve that prevents air flowing in the intake manifold IM from flowing into the blow-by exhaust path E3. In other words, the PCV is an air valve that restricts the direction of gas flow by allowing gas to flow from the blow-by exhaust path E3 side towards the intake manifold IM side.

[0045] The throttle body (TH) is a valve that regulates the amount of air supplied to the engine (E). More specifically, the amount of air supplied to the engine (E) is regulated by controlling the opening of the throttle body (TH). The opening of the throttle body (TH) is controlled in such a way that the greater the torque required by the engine, the more air is supplied to the engine (E).

[0046] The turbocharger TC compresses the air supplied from the intake passage E1 and supplies it to the engine E. The turbocharger TC also discharges the exhaust gas from the engine E into the exhaust manifold EM. The turbocharger TC includes a turbine T, a compressor C, and a shaft SH.

[0047] Exhaust gas from engine E is supplied to turbine T via exhaust passage E2. Turbine T rotates due to the supplied exhaust gas. Turbine T is connected to compressor C via shaft SH. Therefore, the rotation of turbine T drives compressor C to rotate. Exhaust gas after turbine T is discharged into exhaust manifold EM.

[0048] The compressor C, driven by the turbine T, compresses the air supplied from the intake passage E1. Then, the compressor C supplies the compressed air to the engine E via the intake manifold IM.

[0049] If compressed air is supplied to engine E in this manner, the torque that engine E can output will increase.

[0050] The bypass passage BP bypasses the exhaust passage E2 and the exhaust manifold EM. In other words, the bypass passage BP is a passage used to allow exhaust gas from engine E to flow to the exhaust manifold EM without passing through the turbine T. The amount of exhaust gas flowing into the bypass passage BP is regulated by the exhaust bypass valve WGV.

[0051] The waste gas bypass valve WGV regulates the amount of exhaust gas flowing into the bypass passage BP.

[0052] With the wastegate valve WGV closed, exhaust gas does not flow into the bypass passage BP. In this situation, exhaust gas exiting from exhaust passage E2 is discharged via turbine T. Consequently, turbine T and compressor C rotate, resulting in the supply of compressed air to engine E.

[0053] On the other hand, with the wastegate valve WGV open, exhaust gas flows into the bypass passage BP. In this situation, the exhaust gas exiting from exhaust passage E2 hardly flows towards the turbine T. Consequently, the turbine T and compressor C do not rotate, resulting in uncompressed air being supplied to engine E.

[0054] In other words, the turbocharger TC operates when the exhaust gas bypass valve (WGV) is closed. Conversely, the turbocharger TC does not operate when the exhaust gas bypass valve (WGV) is open.

[0055] <Engine oil deterioration>

[0056] The following considers the case where the exhaust bypass valve WGV is closed, i.e., the turbocharger TC is running.

[0057] With the turbocharger TC running, exhaust gas is discharged through the turbine T, so the pressure of the gas flowing into the exhaust passage E2 increases. Because the exhaust pressure is higher, the amount of work done by the engine E on the gas increases accordingly, so the torque that the engine E can output per unit volume of air decreases.

[0058] Therefore, when the torque required by engine E is the same, more air needs to be supplied to engine E when turbocharger TC is running, compared to when turbocharger TC is not running.

[0059] When more air is supplied to engine E, the amount of air flowing in intake manifold IM increases. If the amount of air flowing in intake manifold IM increases, the air pressure within intake manifold IM becomes higher.

[0060] If the air pressure in the intake manifold IM increases, the amount of blow-by air discharged decreases. In other words, if the air pressure in the intake manifold IM increases, the air exchange rate of blow-by air in the engine E decreases.

[0061] Therefore, with the turbocharger TC operating, the exchange rate of blow-by gas in engine E decreases. As a result, the concentration of blow-by gas in engine E increases.

[0062] Blow-by gases contain substances that contribute to engine oil deterioration, such as nitrogen oxides. Therefore, if the concentration of blow-by gases in engine E increases, engine oil deterioration will be accelerated.

[0063] In other words, the deterioration of engine oil is exacerbated when the exhaust gas bypass valve (WGV) is closed.

[0064] <Summary of Implementation Methods>

[0065] Therefore, in the engine control system disclosed herein, in order to suppress the deterioration of engine oil, the exhaust gas bypass valve is opened when the temperature of the engine oil is below a predetermined threshold.

[0066] (First Embodiment)

[0067] <Composition of Engine Control System>

[0068] Hereinafter, the first embodiment involved in this disclosure will be described in detail with reference to the accompanying drawings.

[0069] First, the configuration of the engine control system involved in this embodiment will be described in detail. Figure 2 This is a block diagram illustrating the configuration of the engine control system according to the first embodiment. Furthermore, in the following description, appropriate reference will be made to... Figure 1 .

[0070] The engine control system 2 involved in this embodiment Figure 1 The engine system 1 shown is controlled. The engine control system 2 obtains the temperature of the engine oil in the engine E. Then, based on the obtained engine oil temperature, it controls the opening and closing of the exhaust gas bypass valve WGV.

[0071] The engine control system 2 according to this embodiment includes an oil temperature sensor 21 and an exhaust bypass valve control unit 22.

[0072] Oil temperature sensor 21 is a temperature sensor installed in engine E to detect the temperature of the engine oil inside engine E. Oil temperature sensor 21 outputs the obtained temperature to exhaust gas bypass valve control unit 22.

[0073] The exhaust gas bypass valve control unit 22 obtains the temperature of the engine oil in the engine E from the oil temperature sensor 21. Then, based on the engine oil temperature detected by the oil temperature sensor 21, it controls the opening and closing of the exhaust gas bypass valve WGV.

[0074] More specifically, the exhaust gas bypass valve control unit 22 controls the opening of the exhaust gas bypass valve WGV when the engine oil temperature detected by the oil temperature sensor 21 is below a predetermined threshold.

[0075] Furthermore, if the engine oil temperature detected by the oil temperature sensor 21 is not below a predetermined threshold, the exhaust gas bypass valve control unit 22 can control the exhaust gas bypass valve WGV to open or to close.

[0076] If the engine oil temperature detected by the oil temperature sensor 21 is not below a predetermined threshold, the exhaust gas bypass valve control unit 22 may, for example, control the opening and closing of the exhaust gas bypass valve WGV based on the required torque of the engine E and the opening degree of the throttle valve TH.

[0077] <Engine Control System Operation>

[0078] Next, the operation of the engine control system, namely the engine control method involved in the first embodiment, will be described in detail. Figure 3 This is a flowchart illustrating the operation of the engine control system according to the first embodiment. Furthermore, in the following description, appropriate references will be made to... Figure 1 and Figure 2 .

[0079] First, the oil temperature sensor 21 detects the oil temperature (step ST101). The detected oil temperature is then output to the exhaust bypass valve control unit 22.

[0080] Next, the exhaust bypass valve control unit 22 determines whether the oil temperature is below a predetermined threshold (step ST102).

[0081] When the oil temperature is below a predetermined threshold (step ST102: Yes), the exhaust bypass valve control unit 22 opens the exhaust bypass valve WGV (step ST103), and the engine control system 2 ends a series of actions.

[0082] If the oil temperature is not below the predetermined threshold (step ST102: No), the exhaust gas bypass valve control unit 22 opens and closes the exhaust gas bypass valve WGV based on the required torque of the engine and the throttle opening (step ST104), and the engine control system 2 ends a series of actions.

[0083] The engine control system 2 involved in this embodiment can also be executed repeatedly. Figure 3 The flowchart illustrates a series of actions. Additionally, the engine control system 2 can repeatedly execute a series of actions, ending the repetition at the point in time when step ST104 was executed.

[0084] As explained above, the engine control system 2 of this embodiment detects the temperature of the engine oil. Then, the engine control system 2 controls the opening and closing of the exhaust gas bypass valve WGV based on the detected temperature.

[0085] With this configuration, the turbocharger can be prevented from operating even when the engine oil is at a low temperature, i.e., when the engine oil is prone to deterioration. As a result, the engine control system 2 can suppress engine oil deterioration.

[0086] Furthermore, when the engine oil temperature is low, the engine oil may not be fully distributed throughout the engine. Therefore, if the turbocharger is not operated when the engine oil temperature is low, the engine control system 2 can also suppress engine deterioration.

[0087] (Second Implementation)

[0088] <Composition of Engine Control System>

[0089] Hereinafter, the second embodiment involved in this disclosure will be described in detail with reference to the accompanying drawings.

[0090] First, the configuration of the engine control system involved in this embodiment will be described in detail. Figure 4 This is a block diagram illustrating the configuration of the engine control system according to the second embodiment. Furthermore, in the following description, appropriate reference will be made to... Figure 1 .

[0091] The engine control system 2 described in this embodiment is an application example of the engine control system 2 described in the first embodiment. The engine control system 2 described in this embodiment differs from the engine control system 2 described in the first embodiment in that it has a torque calculation unit 23 and a throttle control unit 24.

[0092] Furthermore, the preferred embodiment of the oil temperature sensor 21 is the same as that in the first embodiment.

[0093] Furthermore, in the engine control system 2 according to this embodiment, the exhaust gas bypass valve control unit 22, the required torque calculation unit 23, and the throttle control unit 24 are implemented as functional blocks of the engine control unit ECU.

[0094] The engine control unit (ECU) includes, for example, an arithmetic unit such as a CPU (Central Processing Unit) (not shown), and a storage unit such as RAM (Random Access Memory) and ROM (Read Only Memory) that stores programs and data used to control the engine system 1. In other words, the engine control unit (ECU) functions as a computer, controlling the engine system 1 based on the aforementioned programs.

[0095] Therefore, constitute Figure 4 The functional blocks of the engine control unit (ECU) shown can be constructed in hardware by the aforementioned CPU, storage unit, and other circuits, and in software by the program stored in the storage unit for controlling the engine system 1. That is, the engine system 1 can be implemented in various forms through hardware, software, or a combination of both.

[0096] Furthermore, the program includes a group of commands (or software code) used, when read into a computer, to cause the computer to perform one or more functions described in the embodiments. The program may also be stored on a non-transitory computer-readable medium or a physical storage medium. By way of example, and not limitation, a computer-readable medium or a physical storage medium includes random access memory (RAM), read-only memory (ROM), flash memory, solid-state drives (SSDs) or other memory technologies, CD-ROM, digital versatile optical disc (DVD), Blu-ray disc (registered trademark) or other optical disc storage devices, magnetic tape, magnetic tape, disk storage devices, or other magnetic storage devices. The program may be transmitted on a transient computer-readable medium or a communication medium. By way of example, and not limitation, a transient computer-readable medium or communication medium includes electrical, optical, acoustic, or other forms of propagation signals.

[0097] The torque calculation unit 23 obtains the amount of time the accelerator pedal AC is depressed. Then, based on the obtained amount of time the accelerator pedal AC is depressed, the required torque for the engine E is calculated. The required torque calculation unit 23 outputs the calculated required torque to the exhaust gas bypass valve control unit 22 and the throttle control unit 24.

[0098] Throttle control unit 24 controls the opening of throttle TH, that is, the amount of air supplied to engine E. More specifically, throttle control unit 24 controls the amount of air supplied to engine E based on the required torque obtained from required torque calculation unit 23.

[0099] The throttle control unit 24 controls the opening of the throttle valve TH in such a way that the greater the required torque obtained from the required torque calculation unit 23, the greater the amount of air supplied to the engine E.

[0100] Furthermore, the larger the throttle opening, the more air the throttle valve TH supplies to the engine E.

[0101] The throttle control unit 24 outputs a control signal to the throttle TH indicating the opening degree of the throttle TH. In addition, the throttle control unit 24 also outputs a control signal to the waste gas bypass valve control unit 22 indicating the opening degree of the throttle TH.

[0102] First, the exhaust bypass valve control unit 22 of this embodiment determines whether the required torque for engine E obtained from the required torque calculation unit 23 is above a predetermined threshold.

[0103] Furthermore, when the required torque for engine E is above a predetermined threshold, the exhaust gas bypass valve control unit 22 controls the exhaust gas bypass valve WGV to close, regardless of the engine oil temperature.

[0104] With this configuration, the required torque can be delivered even when the driver demands a level of torque that would be impossible to output without the turbocharger. As a result, engine responsiveness is improved, and vehicle handling is enhanced.

[0105] When the required torque for engine E is above a predetermined threshold, the exhaust gas bypass valve control unit 22 obtains the engine oil temperature and throttle opening. Then, based on the obtained oil temperature and throttle opening, it controls the opening and closing of the exhaust gas bypass valve WGV.

[0106] More specifically, similar to the case in the first embodiment, when the engine oil temperature is below a predetermined threshold, the exhaust gas bypass valve control unit 22 controls the exhaust gas bypass valve WGV to open.

[0107] If the engine oil temperature is not below a predetermined threshold, the exhaust gas bypass valve control unit 22 determines whether the throttle opening is above a predetermined threshold.

[0108] Furthermore, when the throttle opening is above a predetermined threshold, the exhaust bypass valve control unit 22 controls the exhaust bypass valve WGV to close.

[0109] In addition, if the throttle opening is not above a predetermined threshold, the waste gas bypass valve control unit 22 controls the waste gas bypass valve WGV to open.

[0110] With this configuration, the compression of air supplied to the engine E can begin before the torque that would not be output if the turbocharger were not running, thus improving the engine's responsiveness.

[0111] <Engine Control System Operation>

[0112] Next, the operation of the engine control system, namely the engine control method involved in the second embodiment, will be described in detail. Figure 5 This is a flowchart illustrating the operation of the engine control system according to the second embodiment. Furthermore, in the following description, appropriate references will be made to... Figure 1 and Figure 4 .

[0113] First, the torque calculation unit obtains the accelerator pedal pressure (step ST201) and calculates the required torque (step ST202). The calculated required torque is then output to the exhaust bypass valve control unit 22.

[0114] Next, the exhaust bypass valve control unit 22 determines whether the required torque is above a predetermined threshold (step ST203).

[0115] When the required torque is above a predetermined threshold (step ST203: Yes), the exhaust bypass valve control unit 22 closes the exhaust bypass valve (step ST209), and the engine control system 2 ends a series of actions.

[0116] If the required torque is not above a predetermined threshold (step ST203: No), the waste gas bypass valve control unit 22 obtains the throttle opening from the throttle control unit 24 (step ST204). Furthermore, the oil temperature is obtained from the oil temperature sensor 21 (step ST205).

[0117] However, the execution order of steps ST204 and ST205 can also be reversed. Additionally, steps ST204 and ST205 can be executed in parallel.

[0118] Next, the exhaust bypass valve control unit 22 determines whether the oil temperature is below a predetermined threshold (step ST206).

[0119] When the oil temperature is below a predetermined threshold (step ST206: Yes), the exhaust bypass valve control unit 22 opens the exhaust bypass valve (step ST207), and the engine control system 2 ends a series of actions.

[0120] If the oil temperature is not below the predetermined threshold (step ST206: No), the waste gas bypass valve control unit 22 determines whether the throttle opening is above the predetermined threshold (step ST208).

[0121] When the throttle opening is above a predetermined threshold (step ST208: Yes), the exhaust bypass valve control unit 22 closes the exhaust bypass valve (step ST209), and the engine control system 2 ends a series of actions.

[0122] If the throttle opening is not above the predetermined threshold (step ST208: No), the exhaust bypass valve control unit 22 opens the exhaust bypass valve (step ST207), and the engine control system 2 ends a series of actions.

[0123] The engine control system 2 involved in this embodiment can be executed repeatedly. Figure 5 The flowchart illustrates a series of actions.

[0124] As explained above, when the engine oil temperature is below a predetermined threshold, the engine control system 2 according to this embodiment opens the exhaust bypass valve, preventing the turbocharger from operating. As a result, the engine control system 2 is able to suppress engine oil deterioration.

[0125] Furthermore, even when the engine oil temperature is below a predetermined threshold, the engine control system 2 according to this embodiment will operate the turbocharger when the driver requests a torque that requires the turbocharger to operate.

[0126] Based on this configuration, the engine control system 2 can improve engine responsiveness while suppressing engine oil deterioration.

[0127] (Other implementation methods)

[0128] The engine control system disclosed herein may also include a water temperature sensor for detecting the temperature of the engine's coolant.

[0129] Furthermore, the exhaust bypass valve control unit can open the exhaust bypass valve when the temperature of the cooling water detected by the water temperature sensor is below a predetermined threshold.

[0130] The temperature of the engine coolant is related to the temperature of the engine oil. Therefore, the aforementioned configuration can better inhibit engine oil deterioration.

[0131] Based on the present disclosure described above, it will be apparent that embodiments of the present disclosure can be varied in many ways. These variations should not be considered as departing from the spirit and scope of the present disclosure, and all such modifications, which will be apparent to those skilled in the art, are intended to be covered within the scope of the appended claims.

Claims

1. An engine control system, The engine control system includes an oil temperature sensor, a required torque calculation unit, and an exhaust gas bypass valve control unit. The oil temperature sensor detects the temperature of the engine oil. The required torque calculation unit calculates the required torque for the engine based on the amount of accelerator pedal input. The exhaust gas bypass valve control unit controls the opening and closing of the exhaust gas bypass valve based on the engine oil temperature detected by the oil temperature sensor, the required torque calculated by the required torque calculation unit, and the throttle opening. The exhaust gas bypass valve control unit is configured as follows: When the required torque is above a predetermined torque threshold, the exhaust bypass valve is closed regardless of the engine oil temperature. If the required torque is lower than the torque threshold, determine whether the temperature of the engine oil is below a predetermined temperature threshold. When the temperature of the engine oil is below the stated temperature threshold, the exhaust gas bypass valve is opened. If the engine oil temperature exceeds the temperature threshold, determine whether the throttle opening is above a predetermined opening threshold. When the throttle opening is above the threshold value, the exhaust bypass valve is closed. When the throttle opening is lower than the opening threshold, the exhaust bypass valve is opened.

2. An engine control method, comprising: Check the engine oil temperature; The required torque for the engine is calculated based on the amount of accelerator pedal input. as well as The opening and closing of the wastegate valve is controlled based on the detected engine oil temperature, the required torque, and the throttle opening. In the engine control method described above, When the required torque is above a predetermined torque threshold, the exhaust bypass valve is closed regardless of the engine oil temperature. If the required torque is lower than the torque threshold, determine whether the temperature of the engine oil is below a predetermined temperature threshold. When the temperature of the engine oil is below the stated temperature threshold, the exhaust gas bypass valve is opened. If the engine oil temperature exceeds the temperature threshold, determine whether the throttle opening is above a predetermined opening threshold. When the throttle opening is above the threshold value, the exhaust bypass valve is closed. When the throttle opening is lower than the opening threshold, the exhaust bypass valve is opened.

3. A computer-readable storage medium storing an engine control program, The engine control program causes the computer to perform the following actions: Check the engine oil temperature; Calculate the required engine torque based on the accelerator pedal input; and The opening and closing of the wastegate valve is controlled based on the detected engine oil temperature, the required torque, and the throttle opening. In the action, When the required torque is above a predetermined torque threshold, the exhaust bypass valve is closed regardless of the engine oil temperature. If the required torque is lower than the torque threshold, determine whether the temperature of the engine oil is below a predetermined temperature threshold. When the temperature of the engine oil is below the stated temperature threshold, the exhaust gas bypass valve is opened. If the engine oil temperature exceeds the temperature threshold, determine whether the throttle opening is above a predetermined opening threshold. When the throttle opening is above the threshold value, the exhaust bypass valve is closed. When the throttle opening is lower than the opening threshold, the exhaust bypass valve is opened.

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