Exhaust temperature calculation method and device, engine and vehicle

Abstract

The invention discloses an exhaust temperature calculation method and device, an engine and a vehicle. An exhaust temperature calculation method is suitable for an engine comprising a turbocharger and a temperature sensor, the temperature sensor is arranged on the downstream of the turbocharger, and the exhaust temperature calculation method comprises the steps that operation parameters of the engine and measurement data of the temperature sensor are obtained; determining an exhaust temperature estimation value according to the operation parameters; a heat transfer equation is established according to energy conservation, iteration is conducted in the heat transfer equation according to the exhaust temperature estimated value, and an exhaust temperature model value is determined; and determining an exhaust temperature calculation value according to the measured data and the exhaust temperature model value. The technology does not need to depend on the high accuracy of a model, when the system is in a non-standard operation state or system parameters change, good calculation accuracy can still be kept, the original exhaust temperature of the diesel engine can be accurately and rapidly calculated, meanwhile, a sensor arrangement scheme is optimized, the hardware cost is effectively saved, and the fault occurrence probability is reduced.

Description

Technical Field

[0001] The present invention relates to the field of engine control technology, and in particular to an exhaust temperature calculation method, device, engine and vehicle. Background Art

[0002] In an internal combustion engine power system, according to the second law of thermodynamics, the chemical energy released by fuel combustion cannot be fully converted into mechanical energy. The remainder is dissipated as heat, part of which can be recovered through a turbine device or waste heat recovery system. During engine operation, the exhaust temperature parameter plays an important role: when the after-treatment system needs to be heated, the temperature must be increased when the exhaust temperature is insufficient; and when the exhaust temperature is too high, cooling measures must be taken to protect the turbocharger and after-treatment device. The effectiveness of the above operating condition control depends on the accurate measurement of the exhaust temperature.

[0003] For diesel engines, exhaust temperature sensors are usually not installed directly at the exhaust outlet of the engine cylinder. The reasons are: on the one hand, the temperature in this area is extremely high, which can easily damage the sensor function and significantly increase the cost of the sensor; on the other hand, due to spatial layout limitations, the sensor installation is difficult. At present, the commonly used exhaust temperature calculation methods in the industry include calibration based on operating points and superimposing various correction parameters, or fitting calculations through parameters such as injection timing, rail pressure, and air flow. However, these methods generally have complex and time-consuming calibration processes, insufficient calculation accuracy, and are difficult to adapt to the application requirements of vehicle dispersion and harsh operating conditions such as high temperature, high cold, and plateaus. Summary of the Invention

[0004] Embodiments of the present invention provide an exhaust temperature calculation method, device, engine, and vehicle. This technology does not rely on the high accuracy of the model. Even in non-standard operating states or when system parameters change, it can still maintain good calculation accuracy and accurately and quickly calculate the diesel engine's raw exhaust temperature. At the same time, it optimizes the sensor layout scheme, effectively saves hardware costs, and reduces the probability of failure.

[0005] In a first aspect, an embodiment of the present invention provides an exhaust temperature calculation method applicable to an engine including a turbocharger and a temperature sensor, wherein the temperature sensor is disposed downstream of the turbocharger. The exhaust temperature calculation method includes:

[0006] Acquiring operating parameters of the engine and measurement data of the temperature sensor;

[0007] determining an exhaust gas temperature estimate based on the operating parameters;

[0008] Establishing a heat transfer equation based on energy conservation, iterating the heat transfer equation based on the exhaust temperature estimate to determine an exhaust temperature model value;

[0009] An exhaust temperature calculation value is determined based on the measurement data and the exhaust temperature model value.

[0010] Optionally, obtain engine operating parameters, including:

[0011] Get the engine speed and single-cylinder fuel injection amount.

[0012] Optionally, determining an estimated exhaust temperature value according to the operating parameters includes:

[0013] According to the speed and the fuel injection amount, searching the engine MAP to obtain the exhaust temperature estimation value;

[0014] The engine MAP is pre-calibrated.

[0015] Optionally, the exhaust temperature estimate is calculated according to the following formula:

[0016]

[0017] and are the exhaust temperatures in heating mode and normal mode respectively, Ne is the speed, Fset is the single-cylinder fuel injection amount, and f1 and f2 are determined according to the engine MAP.

[0018] Optionally, the heat transfer equations can be formulated based on the law of energy conservation, including:

[0019] According to the law of conservation of energy, the heat transferred from the exhaust gas to the turbine and exhaust pipe system is equal to the increase in the system heat, so:

[0020]

[0021] Among them, Q is the heat transferred from exhaust gas to turbine and exhaust pipe, is the exhaust temperature model value, T sys is the exhaust pipe system temperature, V exh is the exhaust volume flow rate, c v is the specific heat capacity of the exhaust system, M sys The quality of the exhaust pipe system.

[0022] Optionally, the exhaust temperature model value is iteratively determined according to the following formula:

[0023] x1(k+1)=x1(k)+T s x2(k)

[0024]

[0025] is the estimated temperature of the original row, T and Ts are the time step and filtering time respectively, and x1 and x2 are intermediate variables used to assist in calculating the model temperature.

[0026] Optionally, the exhaust temperature calculation value is determined according to the following formula:

[0027]

[0028] Among them, p in and p out are respectively the turbine inlet and turbine outlet pressures of the turbocharger, wg is the opening of the wastegate valve, is the turbine upstream temperature estimated by the sensor, The temperature downstream of the turbine is collected by the sensor.

[0029] In a second aspect, an embodiment of the present invention provides an exhaust temperature calculation device applicable to an engine including a turbocharger and a temperature sensor, wherein the temperature sensor is disposed downstream of the turbocharger, the exhaust temperature calculation device comprising:

[0030] An acquisition module, configured to acquire operating parameters of the engine and measurement data of the temperature sensor;

[0031] an exhaust temperature estimation module, configured to determine an exhaust temperature estimation value based on the operating parameters;

[0032] A model determination module is configured to establish a heat transfer equation according to energy conservation, iterate the heat transfer equation according to the exhaust temperature estimate, and determine an exhaust temperature model value;

[0033] The exhaust temperature calculation module is used to determine the exhaust temperature calculation value based on the measurement data and the exhaust temperature model value.

[0034] In a third aspect, an embodiment of the present invention provides an engine, comprising the above-mentioned exhaust temperature calculation device, wherein the exhaust temperature calculation device is used to execute any of the above-mentioned exhaust temperature calculation methods.

[0035] In a fourth aspect, an embodiment of the present invention provides a vehicle comprising the above-mentioned engine.

[0036] The exhaust temperature calculation method proposed in an embodiment of the present invention obtains engine operating parameters and temperature sensor measurement data. Based on the operating parameters, it determines an exhaust temperature estimate, iterates the exhaust temperature model value through an established heat transfer equation, and finally integrates the temperature sensor measurement data with the exhaust temperature model value to determine the final calculated exhaust temperature value, thereby achieving a precise estimation of the engine's exhaust temperature. This technology does not rely on the high accuracy of the model and can maintain good calculation accuracy even in non-standard operating states or when system parameters change. It can accurately and quickly calculate the diesel engine's exhaust temperature. It also optimizes the sensor layout, effectively saving hardware costs and reducing the probability of failure.

[0037] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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 ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 This is a thermal principle diagram of a turbocharged engine provided by an embodiment of the present invention;

[0040] Figure 2 This is a flow chart of an exhaust temperature calculation method provided by an embodiment of the present invention;

[0041] Figure 3 This is a logical structure diagram of an exhaust temperature calculation method provided by an embodiment of the present invention;

[0042] Figure 4 A schematic structural diagram of an exhaust temperature calculation device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] Figure 1 This is a thermal principle diagram of a turbocharged engine provided by an embodiment of the present invention. Figure 2 This is a flow chart of an exhaust temperature calculation method provided by an embodiment of the present invention, refer to Figure 1 and Figure 2 An embodiment of the present invention provides an exhaust temperature calculation method applicable to an engine including a turbocharger and a temperature sensor, wherein the temperature sensor is arranged downstream of the turbocharger.

[0046] refer to Figure 1 The turbocharger consists of a turbine and a compressor. In a turbocharged engine, the cylinder burns to generate exhaust gas, which drives the turbine to do work. In this process, the original exhaust temperature before the turbine is T ex Reflects the heat release intensity of fuel combustion, exhaust mass flow rate M ex Indicates the total mass of exhaust gas discharged per unit time. The total mass of exhaust gas flowing through the exhaust pipe per unit time. The turbine drives the compressor coaxially, using the ambient temperature T a Indicates the temperature of the air before it enters the compressor, using the intake mass flow rate M air It indicates the air mass entering the compressor per unit time. The pressure ratio before and after the compressor represents the boost intensity. The generated high-pressure air is injected back into the cylinder to assist combustion. The exhaust gas enters the post-processing purification after passing through the turbine. In this process, the original exhaust temperature after the turbine indicates the exhaust gas temperature at the turbine outlet. This energy cycle allows the engine to significantly increase power without increasing displacement.

[0047] refer to Figure 2 , the exhaust temperature calculation methods include:

[0048] S110: Acquire engine operating parameters and temperature sensor measurement data.

[0049] The exhaust temperature calculation method proposed in this embodiment of the present invention requires first obtaining the engine's operating parameters and temperature sensor measurement data, which serve as the basis for subsequent calculations. The engine's operating parameters refer to various data indicators that reflect the engine's operating state, performance, and operating conditions. These data can be directly read in real time from the engine's electronic control unit for subsequent model estimation. Because the temperature at the engine cylinder exhaust outlet is relatively high, while the exhaust temperature downstream of the turbocharger is relatively low, and there is more space in the downstream piping, the temperature sensor is placed downstream of the turbocharger to facilitate the acquisition of stable temperature measurement data for subsequent correction of the model results.

[0050] S120: Determine an estimated exhaust temperature value according to operating parameters.

[0051] The exhaust temperature estimate can be determined based on the engine's operating parameters. When the engine's operating parameters change, the corresponding exhaust temperature estimate is immediately matched. This avoids the computational delays associated with traditional methods and provides a starting point for subsequent iterations of the heat transfer equation, enabling accurate simulation of dynamic processes.

[0052] S130 , establishing a heat transfer equation based on energy conservation, iterating the heat transfer equation based on the exhaust temperature estimate, and determining an exhaust temperature model value.

[0053] Based on the principle of energy conservation, a heat transfer equation is established to describe the relationship between exhaust heat transfer and system temperature changes. Through iterative calculations, the exhaust temperature estimate is initially substituted into the heat transfer equation, gradually updating the exhaust piping system temperature. Ultimately, a model exhaust temperature value is obtained that accounts for the dynamic heat transfer process. This step simulates the inertial delay in exhaust temperature transfer, making the exhaust temperature model value more accurate than the actual physical process.

[0054] S140 : Determine a calculated exhaust temperature value based on the measurement data and the exhaust temperature model value.

[0055] Based on the downstream temperature data measured by the temperature sensor and the exhaust temperature model value, through the auxiliary correction of some operating parameters, the new original exhaust temperature estimate can be determined by reverse deduction, and the iterative update can be completed to obtain the final exhaust temperature calculation value.

[0056] The exhaust temperature calculation method proposed in an embodiment of the present invention obtains engine operating parameters and temperature sensor measurement data. Based on the operating parameters, it determines an exhaust temperature estimate, iterates the exhaust temperature model value through an established heat transfer equation, and finally integrates the temperature sensor measurement data with the exhaust temperature model value to determine the final calculated exhaust temperature value, thereby achieving a precise estimation of the engine's exhaust temperature. This method does not rely on the high accuracy of the model and can maintain good calculation accuracy even in non-standard operating states or when system parameters change. It can accurately and quickly calculate the diesel engine's exhaust temperature. It also optimizes the sensor layout, effectively saving hardware costs and reducing the probability of failure.

[0057] Optionally, obtaining the operating parameters of the engine includes: obtaining the engine speed and the single-cylinder fuel injection amount.

[0058] Engine speed refers to the real-time rotational speed of the engine crankshaft. Higher engine speeds increase the number of cylinder combustion cycles per unit time, leading to greater exhaust flow and a stronger cumulative effect on exhaust temperature and energy. Single-cylinder fuel injection volume refers to the amount of fuel injected into each cylinder during a single engine cycle. Increasing single-cylinder fuel injection volume increases the heat content of the exhaust gas after combustion, leading to higher exhaust temperatures. The close correlation between engine speed and single-cylinder fuel injection volume and exhaust temperature makes this method suitable for rapid estimation of exhaust temperature under various operating conditions.

[0059] Optional, Figure 3 This is a logical structure diagram of an exhaust temperature calculation method provided by an embodiment of the present invention, refer to Figure 3 , determining an exhaust temperature estimate value according to the operating parameters, including: finding an engine MAP according to the speed and the fuel injection amount to obtain an exhaust temperature estimate value; wherein the engine MAP is pre-calibrated.

[0060] The engine MAP is a calibrated data table that stores target parameter values ​​for different operating conditions. By inputting engine speed and per-cylinder fuel injection quantity, it outputs exhaust temperature estimates for the corresponding operating conditions. Direct table lookup significantly improves algorithm efficiency and engineering practicality. Even when engine speed and per-cylinder fuel injection quantity change, the pre-calibrated MAP table can still quickly provide reasonable estimates. Subsequent error correction through sensor fusion improves system robustness.

[0061] Optionally, an exhaust gas temperature estimate is calculated according to the following formula:

[0062]

[0063] and are the exhaust temperatures in heating mode and normal mode respectively, Ne is the speed, Fset is the single-cylinder fuel injection amount, and f1 and f2 are determined according to the engine MAP.

[0064] The engine has different requirements for exhaust temperature control under different working conditions: the heating mode is suitable for cold start conditions, when the exhaust temperature needs to be actively increased; the normal mode is suitable for stable engine operation, when the exhaust temperature needs to be balanced to ensure power while avoiding excessive exhaust temperature. Based on the speed and single-cylinder fuel injection amount, the original exhaust temperature estimate is determined according to the engine MAP in different working modes.

[0065] For example, the current engine speed Ne = 1200 rpm, the current single-cylinder fuel injection amount Fset = 60 mg / st, and the exhaust temperature in the heating mode is obtained by looking up the table Exhaust temperature in normal mode

[0066]

[0067] Optionally, a heat transfer equation can be established based on the law of conservation of energy, including: According to the law of conservation of energy, the heat transferred from the exhaust gas to the turbine and exhaust pipe system is equal to the increase in the heat of the system, which can be obtained:

[0068]

[0069] Among them, Q is the heat transferred from exhaust gas to turbine and exhaust pipe, is the exhaust temperature model value, T sys is the exhaust pipe system temperature, V exh is the exhaust volume flow rate, c v is the specific heat capacity of the exhaust system, M sys The quality of the exhaust pipe system.

[0070] The exhaust temperature estimate obtained from the engine MAP lookup table is an empirical mapping under normal operating conditions, reflecting an estimate of the expected exhaust temperature under certain operating conditions. However, the actual exhaust temperature changes dynamically. The heat transfer equation calculates the heat transferred from the exhaust gas to the turbine and exhaust pipe using the exhaust temperature model value, the pipe system temperature, and the exhaust volume flow rate. The heat transfer equation relates the heat carried by the exhaust gas to the heat added by the pipe system: when the engine accelerates, the exhaust temperature rises, and the exhaust pipe system temperature also increases accordingly. When the engine decelerates, the heat stored in the exhaust pipe system is slowly released, and the exhaust temperature also decreases.

[0071] When the initial system temperature is given T can be calculated over time sys For example, when the exhaust pipe system temperature T sys =200℃, the current exhaust temperature model value By iteratively solving the equation, we can find that the system temperature at the current moment is 300℃.

[0072] Optionally, the exhaust temperature model value is iteratively determined according to the following formula:

[0073] x1(k+1)=x1(k)+T s x2(k)

[0074]

[0075]

[0076] is the estimated temperature of the original row, T and Ts are the time step and filtering time respectively, and x1 and x2 are intermediate variables used to assist in calculating the model temperature.

[0077] The exhaust temperature x1(k+1) at the next moment is the current temperature x1(k) plus the filtering time T s Multiply by the temperature change rate x2(k); the change rate x2(k+1) at the next moment is obtained by subtracting the two correction terms from the current change rate x2(k); the exhaust temperature in heating mode It is based on the exhaust temperature value at the previous moment, plus the filtering time T s Multiply by the temperature change rate x2(k) to get; finally use the ratio of the current and previous exhaust temperatures Correct the original estimated temperature value at the previous moment Get the current model temperature value

[0078] It should be noted that when calculating the proportion of the original exhaust model temperature change due to changes in operating conditions, in order to eliminate the error introduced by noise, a second-order linear differentiator is used to obtain a more stable proportion, thereby reducing the calculation error.

[0079] The heat transfer equation calculates the inertial delay of exhaust temperature in transient processes in detail, ensuring that model values ​​are synchronized with sensor values ​​on the time axis. This compensates for the lag in the MAP lookup table and makes the exhaust temperature estimation more consistent with the actual dynamic process. Compared with simple filtering methods, the model-based heat transfer equation is easier to calibrate and has greater adaptability.

[0080] For example, by iterative calculation,

[0081] Optionally, the calculated exhaust temperature value is determined according to the following formula:

[0082]

[0083] Among them, p in and pout are respectively the turbine inlet and turbine outlet pressures of the turbocharger, wg is the opening of the wastegate valve, is the turbine upstream temperature estimated by the sensor, The temperature downstream of the turbine is collected by the sensor.

[0084] It is understandable that This involves subtracting the temperature deviation caused by exhaust heat from the current model temperature value. This, combined with the introduction of a function related to the turbocharger's turbine inlet-to-turbine outlet pressure ratio and the wastegate valve opening, allows for more realistic calculations of the turbine upstream temperature. This allows for the reverse calculation of the turbine upstream temperature using the turbine downstream temperature, which ultimately results in the calculated exhaust temperature. Throughout this process, the exhaust temperature estimate changes continuously, without sudden changes. Sensor fusion and physical corrections are used to produce an accurate and reliable calculated exhaust temperature value.

[0085] For example, when f3(3,60)=0.7, the turbine downstream temperature collected by the sensor is Turbine upstream temperature estimated by sensor Final estimated original row temperature

[0086] Figure 4 This is a schematic diagram of the structure of an exhaust temperature calculation device provided in an embodiment of the present invention, which is applicable to an engine including a turbocharger and a temperature sensor. The temperature sensor is arranged downstream of the turbocharger. The exhaust temperature calculation device includes:

[0087] An acquisition module 10 is used to acquire the operating parameters of the engine and the measurement data of the temperature sensor; an exhaust temperature estimation module 20 is used to determine the exhaust temperature estimate value based on the operating parameters; a model determination module 30 is used to establish a heat transfer equation based on the energy conservation principle, and iterate the heat transfer equation based on the exhaust temperature estimate value to determine the exhaust temperature model value; an exhaust temperature calculation module 40 is used to determine the exhaust temperature calculation value based on the measurement data and the exhaust temperature model value.

[0088] Because the exhaust temperature calculation device in the embodiment of the present invention is used to execute the above-mentioned exhaust temperature calculation method, it obtains engine operating parameters and temperature sensor measurement data, and determines an exhaust temperature estimate based on the operating parameters. This is then iterated within the established heat transfer equation to determine the exhaust temperature model value. Finally, the temperature sensor measurement data and the exhaust temperature model value are integrated to determine the final calculated exhaust temperature value, thereby achieving a precise estimation of the engine's raw exhaust temperature. This technology does not rely on the high accuracy of the model and can maintain good calculation accuracy even in non-standard operating states or when system parameters change. It can accurately and quickly calculate the diesel engine's raw exhaust temperature, while also optimizing the sensor layout scheme, effectively saving hardware costs and reducing the probability of failure.

[0089] Based on the same inventive concept, an embodiment of the present invention provides an engine including the aforementioned exhaust temperature calculation device, which is configured to execute any of the aforementioned exhaust temperature calculation methods. Since the engine in this embodiment of the present invention includes both the aforementioned exhaust temperature calculation device and any of the aforementioned exhaust temperature calculation methods, it possesses the beneficial effects of the corresponding exhaust temperature calculation device and method, and further description thereof will not be given here.

[0090] Based on the same inventive concept, an embodiment of the present invention provides a vehicle including the above-mentioned engine. Since the vehicle in the embodiment of the present invention includes the above-mentioned engine, it has the beneficial effects of the corresponding engine, which will not be repeated here.

[0091] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for calculating exhaust temperature, characterized in that: Applicable to an engine including a turbocharger and a temperature sensor, wherein the temperature sensor is arranged downstream of the turbocharger, the exhaust temperature calculation method includes: Acquiring operating parameters of the engine and measurement data of the temperature sensor; determining an exhaust gas temperature estimate based on the operating parameters; Establishing a heat transfer equation based on energy conservation, iterating the heat transfer equation based on the exhaust temperature estimate to determine an exhaust temperature model value; An exhaust temperature calculation value is determined based on the measurement data and the exhaust temperature model value.

2. The exhaust temperature calculation method according to claim 1, characterized in that: Get the engine's operating parameters, including: Get the engine speed and single-cylinder fuel injection amount.

3. The exhaust temperature calculation method according to claim 2, characterized in that: Determining an exhaust gas temperature estimate based on the operating parameters includes: According to the speed and the fuel injection amount, searching the engine MAP to obtain the exhaust temperature estimation value; The engine MAP is pre-calibrated.

4. The exhaust temperature calculation method according to claim 3, characterized in that: The exhaust gas temperature estimate is calculated according to the following formula: and are the exhaust temperatures in heating mode and normal mode respectively, Ne is the speed, Fset is the single-cylinder fuel injection amount, and f1 and f2 are determined according to the engine MAP.

5. The exhaust temperature calculation method according to claim 4, characterized in that: The heat transfer equation is established based on the conservation of energy, including: According to the law of conservation of energy, the heat transferred from the exhaust gas to the turbine and exhaust pipe system is equal to the increase in the system heat, so: Among them, Q is the heat transferred from exhaust gas to turbine and exhaust pipe, is the exhaust temperature model value, T sys is the exhaust pipe system temperature, V exh is the exhaust volume flow rate, c v is the specific heat capacity of the exhaust system, M sys The quality of the exhaust pipe system.

6. The exhaust gas temperature calculation method according to claim 5, characterized in that: The exhaust temperature model value is iteratively determined according to the following formula: x1(k+1)=x1(k)+T s x2(k) is the estimated temperature of the original row, T and Ts are the time step and filtering time respectively, and x1 and x2 are intermediate variables used to assist in calculating the model temperature.

7. The exhaust gas temperature calculation method according to claim 6, characterized in that: The calculated exhaust temperature value is determined according to the following formula: Among them, p in and p out are respectively the turbine inlet and turbine outlet pressures of the turbocharger, wg is the opening of the wastegate valve, is the turbine upstream temperature estimated by the sensor, The temperature downstream of the turbine is collected by the sensor.

8. An exhaust gas temperature calculation device, characterized in that: Applicable to an engine including a turbocharger and a temperature sensor, wherein the temperature sensor is arranged downstream of the turbocharger, the exhaust temperature calculation device comprises: An acquisition module, configured to acquire operating parameters of the engine and measurement data of the temperature sensor; an exhaust temperature estimation module, configured to determine an exhaust temperature estimation value based on the operating parameters; A model determination module is configured to establish a heat transfer equation according to energy conservation, iterate the heat transfer equation according to the exhaust temperature estimate, and determine an exhaust temperature model value; The exhaust temperature calculation module is used to determine the exhaust temperature calculation value based on the measurement data and the exhaust temperature model value.

9. An engine, characterized in that: It comprises the exhaust temperature calculation device according to claim 8, and the exhaust temperature calculation device is used to execute the exhaust temperature calculation method according to any one of claims 1 to 7.

10. A vehicle, characterized in that: Including the engine described in claim 9.

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