Engine system post-operation control method, device and equipment

Abstract

This invention discloses a method, apparatus, and device for controlling the subsequent operation of an engine system. The engine system includes an engine and a turbocharger. The method includes: monitoring the engine coolant temperature and engine exhaust temperature during engine operation of a target vehicle; in response to receiving a shutdown command, determining a first preceding time period sequence of engine coolant temperature and engine exhaust temperature based on the engine coolant temperature and engine exhaust temperature, wherein the first preceding time period is the period before the engine receives the shutdown command; determining a first subsequent operation parameter of the engine system based on the engine coolant temperature sequence and engine exhaust temperature sequence; and controlling the subsequent operation of the engine system based on the first subsequent operation parameter to ensure that the coolant temperature of the turbocharger is lower than a preset temperature threshold. This invention solves the technical problem of easy melting of the engine system's water tank.

Description

Technical Field

[0001] This invention belongs to the field of engine control technology, and particularly relates to a method, device and equipment for controlling the operation of an engine system. Background Technology

[0002] Hybrid vehicles may encounter some problems during actual use. When the engine system has been running under high load for a period of time, the vehicle may suddenly lose power or the engine may stop directly. At this time, the turbocharger has accumulated too much heat after experiencing a period of high temperature conditions. After the engine system stops, the local heat cannot be dissipated (taking the engine system matched with a mechanical water pump as an example). After the engine stops, the coolant in the turbocharger water jacket will boil and vaporize due to the heat recovery after the engine stops. The high temperature gas will often directly enter the water tank, causing the water tank to melt in some areas.

[0003] Existing strategies for turbocharger shutdown reheating generally control the engine system's subsequent operation based on the engine coolant temperature at the time of shutdown. For example, if the engine coolant temperature exceeds a certain threshold (e.g., 118°C) at the time of shutdown, the engine system will restart. However, in actual use, when the engine system operates under high load for extended periods, its coolant temperature may not reach a high level. For instance, in off-road vehicles equipped with high-power fans, after 30 minutes of high-power engine operation (load > 90kW), the engine coolant temperature balances at 103°C, far below the threshold for triggering subsequent operation. In this case, the engine system will not restart, and the engine coolant tank is prone to melting. Summary of the Invention

[0004] This invention provides a method, apparatus, and equipment for controlling the operation of an engine system, which solves the technical problem that the water tank of an engine system is prone to melting.

[0005] In a first aspect, embodiments of the present invention provide a method for controlling the subsequent operation of an engine system, the engine system including an engine and a turbocharger; the method includes: monitoring engine coolant temperature and engine exhaust temperature during engine operation of a target vehicle; in response to the engine receiving a shutdown command, determining an engine coolant temperature sequence and an engine exhaust temperature sequence for a first preceding time period based on the engine coolant temperature and the engine exhaust temperature, the first preceding time period being the period before the engine receives the shutdown command; determining a first subsequent operation parameter of the engine system based on the engine coolant temperature sequence and the engine exhaust temperature sequence; and controlling the subsequent operation of the engine system based on the first subsequent operation parameter to ensure that the coolant temperature of the turbocharger is less than a preset temperature threshold.

[0006] In conjunction with the first aspect of the present invention, in some embodiments, the method further includes: acquiring the ambient temperature of the environment in which the engine system is located before the engine receives the shutdown command; determining the first post-operational parameters of the engine system based on the engine coolant temperature sequence and the engine exhaust temperature sequence includes: determining the first post-operational parameters of the engine system based on the ambient temperature, the engine coolant temperature sequence and the engine exhaust temperature sequence.

[0007] In conjunction with the first aspect of the present invention, in some embodiments, determining the first subsequent operating parameters of the engine system based on the ambient temperature, the engine coolant temperature sequence, and the engine exhaust temperature sequence includes: determining the average coolant temperature of the engine in the first preceding period based on the engine coolant temperature sequence; determining the average exhaust temperature of the engine in the first preceding period based on the engine exhaust temperature sequence; and determining the first subsequent operating parameters of the engine system based on the ambient temperature, the average coolant temperature, and the average exhaust temperature.

[0008] In conjunction with the first aspect of the present invention, in some embodiments, the engine system further includes an electric water pump and an air-cooling device; determining the first post-operation parameters of the engine system based on the ambient temperature, the average water temperature, and the average exhaust temperature includes: determining the first post-operation duration and water pump speed of the electric water pump, and the second post-operation duration of the air-cooling device, based on the ambient temperature, the average water temperature, the average exhaust temperature, and a preset first correspondence; the first correspondence is the relationship between the test ambient temperature, the engine water temperature and exhaust temperature, the post-operation duration and speed of the electric water pump, and the post-operation duration of the air-cooling device obtained through pre-testing; the first post-operation parameters are determined based on the first post-operation duration, the water pump speed, and the second post-operation duration.

[0009] In conjunction with the first aspect of the present invention, in some embodiments, the engine system further includes a mechanical water pump and an air-cooling device; determining the first post-operation parameters of the engine system based on the ambient temperature, the average water temperature, and the average exhaust temperature includes: determining the first post-operation duration, the first engine speed, and the engine torque, and the second post-operation duration of the air-cooling device based on the ambient temperature, the average water temperature, the average exhaust temperature, and a preset first correspondence; the first correspondence is the relationship between the test ambient temperature, the engine water temperature, the exhaust temperature, the post-operation duration, the speed and torque of the engine, and the post-operation duration of the air-cooling device obtained through pre-testing; and determining the first post-operation parameters based on the first post-operation duration, the first engine speed, the engine torque, and the second post-operation duration.

[0010] In conjunction with the first aspect of the present invention, in some embodiments, determining the first post-running parameter based on the first post-running duration, the first engine speed, the engine torque, and the second post-running duration includes: acquiring the vehicle speed of the target vehicle; correcting the first engine speed and the first post-running duration based on the vehicle speed to obtain the first post-running parameter; the first post-running parameter includes the engine torque and the second post-running duration.

[0011] In conjunction with the first aspect of the present invention, in some embodiments, the step of correcting the first engine speed and the first post-running duration based on the vehicle speed to obtain the first post-running parameter includes: correcting the first engine speed based on the vehicle speed to obtain a second engine speed; correcting the first post-running duration based on the difference between the first engine speed and the second engine speed to obtain a third post-running duration; and using the third post-running duration, the second engine speed, the engine torque, and the second post-running duration as the first post-running parameter.

[0012] In conjunction with the first aspect of the present invention, in some embodiments, the step of correcting the first engine speed based on the vehicle speed to obtain a second engine speed includes: determining an upper limit threshold for engine speed based on the vehicle speed; if the first engine speed is greater than the upper limit threshold for engine speed, using the upper limit threshold for engine speed as the second engine speed; if the first engine speed is less than the upper limit threshold for engine speed, using a speed value between the first engine speed and the upper limit threshold for engine speed as the second engine speed.

[0013] In conjunction with the first aspect of the present invention, in some embodiments, the first correspondence is obtained in advance through the following experimental steps: under the test ambient temperature, the test vehicle is controlled to enter a test state, wherein the test state is that the engine coolant temperature of the test vehicle reaches a preset test coolant temperature and the engine exhaust temperature of the test vehicle reaches a preset test exhaust temperature; while the test vehicle is in the test state, the air-cooling device of the test vehicle is controlled to run for a preset test duration, and the electric water pump of the test vehicle is controlled to run at a preset test speed, and the running time of the electric water pump of the test vehicle is recorded when the coolant temperature of the turbocharger in the test vehicle drops to the preset temperature threshold; based on the test ambient temperature, the preset test coolant temperature, the preset test exhaust temperature, the preset test speed, the preset test duration, and the running time of the electric water pump of the test vehicle, the first correspondence is obtained.

[0014] In conjunction with the first aspect of the present invention, in some embodiments, the first correspondence is obtained in advance through the following experimental steps: under the test ambient temperature, the test vehicle is controlled to enter a test state, wherein the test state is that the engine coolant temperature of the test vehicle reaches a preset test coolant temperature and the engine exhaust temperature of the test vehicle reaches a preset test exhaust temperature; while the test vehicle is in the test state, the air-cooling device of the test vehicle is controlled to run for a preset test duration, and the engine of the test vehicle is controlled to run at a preset test speed and a preset test torque, and the engine's subsequent running time is recorded when the coolant temperature of the turbocharger in the test vehicle drops to the preset temperature threshold; based on the test ambient temperature, the preset test coolant temperature, the preset test exhaust temperature, the preset test speed, the preset test torque, the preset test duration, and the engine's subsequent running time, the first correspondence is obtained.

[0015] Secondly, embodiments of the present invention provide an engine system post-operation control device, the engine system including an engine and a turbocharger; the device includes: a monitoring unit for monitoring engine coolant temperature and engine exhaust temperature during engine operation of a target vehicle; a response unit for determining an engine coolant temperature sequence and an engine exhaust temperature sequence for a first preceding time period based on the engine coolant temperature and the engine exhaust temperature in response to the engine receiving a stop command, the first preceding time period being the time period before the engine receives the stop command; a parameter determination unit for determining a first post-operation parameter of the engine system based on the engine coolant temperature sequence and the engine exhaust temperature sequence; and a post-operation control unit for controlling the post-operation of the engine system based on the first post-operation parameter to ensure that the coolant temperature of the turbocharger is less than a preset temperature threshold.

[0016] Thirdly, embodiments of the present invention provide an electronic device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in any of the first aspects.

[0017] The one or more technical solutions provided in the embodiments of the present invention achieve at least the following technical effects or advantages: This invention, in response to an engine shutdown command, determines a first pre-operational time period's engine coolant temperature sequence and engine exhaust temperature sequence based on the engine coolant temperature and exhaust temperature. Based on these sequences, it determines first post-operational parameters for the engine system to control its subsequent operation, ensuring the turbocharger's coolant temperature remains below a preset temperature threshold. The turbocharger's coolant originates from the engine's main water channel; higher engine coolant temperatures result in hotter coolant entering the turbocharger, thus exhibiting a strong correlation between turbocharger coolant temperature and engine coolant temperature. Simultaneously, higher exhaust temperatures lead to higher turbine housing temperatures, directly heating the turbocharger's bearing housing and water jacket. Therefore, most of the turbocharger's coolant heat originates from engine exhaust, again demonstrating a strong correlation between turbocharger coolant temperature and engine exhaust temperature. Thus, this invention, by combining engine exhaust and coolant temperatures, more accurately reflects the turbocharger's coolant temperature, thereby precisely determining the post-operational strategy and reducing the likelihood of the engine system's radiator melting.

[0018] In addition, the embodiments of the present invention reflect the coolant temperature of the turbocharger by using the engine water temperature sequence and the engine exhaust temperature sequence of the first preceding period, avoiding the need to reflect the coolant temperature of the turbocharger by using only the engine water temperature or engine exhaust temperature at a single moment. This allows for a more accurate reflection of the coolant temperature of the turbocharger, thus enabling accurate control of subsequent operation to meet cooling requirements and reducing the possibility of the engine system's water tank melting. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a flowchart of the engine system post-operation control method in an embodiment of the present invention; Figure 2 This is a functional block diagram of the engine system rear operation control device in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of an electronic device in an embodiment of the present invention. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] In this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this invention.

[0023] This invention provides a method for controlling the operation of an engine system after it has been tested. The engine system includes an engine and a turbocharger. This method can be executed by a target controller on a target vehicle, which can be a vehicle controller or the engine system controller. (See reference) Figure 1 As shown, the method includes the following steps S101 to S104: S101: Monitor engine coolant temperature and engine exhaust temperature during engine operation of the target vehicle.

[0024] It should be noted that the engine system is located on the target vehicle, engine coolant temperature refers to the engine's coolant temperature, and engine exhaust temperature refers to the engine's exhaust temperature. Engine coolant temperature and engine exhaust temperature are sampled according to a preset sampling frequency.

[0025] S102: In response to the engine receiving a shutdown command, determine the engine coolant temperature sequence and engine exhaust temperature sequence for the first preceding period based on the engine coolant temperature and engine exhaust temperature. The first preceding period is the period before the engine receives the shutdown command.

[0026] It should be noted that the target vehicle can be a hybrid vehicle, and the scenario in which the shutdown command is issued can be a vehicle parking scenario or a scenario in which fuel power is switched to electric power.

[0027] It should be noted that the end time of the first pre-sequence period can be the moment the engine receives the shutdown command. The engine coolant temperature sequence includes the coolant temperature of the engine at each sampling moment within the first pre-sequence period, and the engine exhaust temperature sequence includes the exhaust temperature of the engine at each sampling moment within the first pre-sequence period. The duration of the first pre-sequence period can be from 0.1 min to 10 min.

[0028] S103: Determine the first post-operational parameters of the engine system based on the engine coolant temperature sequence and the engine exhaust temperature sequence.

[0029] In some embodiments, the engine system post-operation control method further includes: acquiring the ambient temperature of the environment where the engine system is located before the engine receives a shutdown command; and determining the first post-operation parameters of the engine system based on the engine coolant temperature sequence and the engine exhaust temperature sequence, including: determining the first post-operation parameters of the engine system based on the ambient temperature, the engine coolant temperature sequence, and the engine exhaust temperature sequence.

[0030] It should be noted that ambient temperature can refer to the temperature at a single moment or the average temperature over a period of time, where the period can be the first preceding time period. Furthermore, increased ambient temperature leads to poorer radiator cooling, which in turn causes the engine coolant temperature to rise. This increased engine coolant temperature indirectly affects the turbocharger water jacket temperature, and consequently, the turbocharger's coolant temperature. Therefore, combining ambient temperature, engine coolant temperature series, and engine exhaust temperature series allows for a more accurate reflection of the turbocharger's coolant temperature, thereby improving the accuracy of subsequent operating time control.

[0031] In some implementations, determining the first post-operational parameters of the engine system based on ambient temperature, engine coolant temperature sequence, and engine exhaust temperature sequence may include the following steps S1031 to S1033: S1031: Determine the average coolant temperature of the engine in the first preceding period based on the engine coolant temperature sequence.

[0032] Specifically, based on the engine coolant temperature sequence, the average coolant temperature of the engine in the first preceding period can be determined by referring to the following formula (1):

[0033] in, The average coolant temperature of the engine during the first pre-launch phase, t 总 The total duration of the first preceding period. This is the engine coolant temperature sequence.

[0034] S1032: Determine the average exhaust temperature of the engine in the first preceding period based on the engine exhaust temperature sequence.

[0035] Specifically, based on the engine exhaust temperature sequence, the average exhaust temperature of the engine in the first preceding period can be determined by referring to the following formula (2):

[0036] in, The average exhaust temperature of the engine during the first pre-phase period, t 总 The total duration of the first preceding period. This is the engine exhaust temperature sequence.

[0037] It should be noted that the embodiments of the present invention reflect the coolant temperature of the turbocharger through the engine water temperature sequence and engine exhaust temperature sequence of the first preceding period, avoiding the need to reflect the coolant temperature of the turbocharger solely through the engine water temperature or engine exhaust temperature at a single moment. This allows for a more accurate reflection of the coolant temperature of the turbocharger, thus enabling precise control of subsequent operation to meet cooling requirements and reducing the possibility of the engine system's water tank melting.

[0038] S1033: Determine the first post-operational parameters of the engine system based on ambient temperature, average water temperature, and average exhaust temperature.

[0039] It should be noted that in order to lower the coolant temperature of the turbocharger, the water pump and air-cooling system need to be operated. The water pump may be an electric water pump or a mechanical water pump. When the mechanical water pump is running, the engine needs to run synchronously. When the electric water pump is running, the engine does not need to run synchronously. Therefore, step S1033 will be explained in detail below depending on the situation: The first scenario is that the engine system also includes an electric water pump and an air-cooling unit: In some implementations, the first post-operation parameters of the engine system are determined based on ambient temperature, average coolant temperature, and average exhaust temperature. This includes: determining the first post-operation duration and pump speed of the electric water pump, and the second post-operation duration of the air-cooling device, based on the ambient temperature, average coolant temperature, average exhaust temperature, and a preset first correspondence; the first correspondence is the relationship between the test ambient temperature, engine coolant temperature, exhaust temperature, post-operation duration and speed of the electric water pump, and post-operation duration of the air-cooling device, obtained through prior testing; and determining the first post-operation parameters based on the first post-operation duration, pump speed, and second post-operation duration.

[0040] In some implementations, the first correspondence is pre-tested through the following experimental steps: Under the test ambient temperature, the test vehicle is controlled to enter the test state, where the engine coolant temperature of the test vehicle reaches a preset test coolant temperature, and the engine exhaust temperature of the test vehicle reaches a preset test exhaust temperature; while the test vehicle is in the test state, the air-cooling device of the test vehicle is controlled to run for a preset test duration, and the electric water pump of the test vehicle is controlled to run at a preset test speed, and the running time of the electric water pump of the test vehicle is recorded when the coolant temperature of the turbocharger in the test vehicle drops to a preset temperature threshold; based on the test ambient temperature, preset test coolant temperature, preset test exhaust temperature, preset test speed, preset test duration, and the running time of the electric water pump of the test vehicle, the first correspondence is obtained.

[0041] It should be noted that the air-cooling device can be a fan, which can be installed at the radiator (water tank) to force air cooling of the radiator and reduce the coolant temperature. The start time for the end-run duration of the electric water pump on the test vehicle is the moment when the test vehicle is in the test state and the electric water pump is running at the preset test speed. The coolant temperature of the turbocharger can refer to the coolant temperature at the turbocharger outlet. The preset temperature threshold can be 135℃.

[0042] The first correspondence can include multiple sub-relationships, as shown in the following examples: First sub-relationship: Ambient temperature is 25℃, average water temperature is 90℃, average discharge temperature is 700℃, the first run duration of the electric water pump is 0s, the pump speed is 3000r / min, and the second run duration of the air-cooled device is 60s; Second sub-relationship: Ambient temperature is 25℃, average water temperature is 90℃, average discharge temperature is 750℃, the first run duration of the electric water pump is 2s, the pump speed is 3000r / min, and the second run duration of the air-cooled device is 60s; Third sub-relationship: Ambient temperature is 25℃, average water temperature is 90℃, average discharge temperature is 800℃, the first run duration of the electric water pump is 4s, the pump speed is 3000r / min, and the second run duration of the air-cooled device is 60s.

[0043] In some implementations, the first post-running parameter is determined based on the first post-running duration, the pump speed, and the second post-running duration. This can be achieved by using the first post-running duration, the pump speed, and the second post-running duration as the first post-running parameter.

[0044] In the first case, the engine system's water pump is an electric water pump. The primary correspondence is essentially determined by looking up a table to determine the operating parameters. Alternatively, the operating parameters can also be determined through mathematical formulas, as explained below: In other embodiments, the first post-operation parameters of the engine system are determined based on ambient temperature, average water temperature, and average exhaust temperature, including: inputting the ambient temperature, average water temperature, and average exhaust temperature into a preset first mathematical formula to obtain the first post-operation duration and water pump speed of the electric water pump, and the second post-operation duration of the air-cooling device; the first mathematical formula is a mathematical relationship between the test ambient temperature, engine water temperature and exhaust temperature, the post-operation duration and speed of the electric water pump, and the post-operation duration of the air-cooling device; the first post-operation parameters are determined based on the first post-operation duration, water pump speed, and second post-operation duration.

[0045] The second scenario is that the engine system also includes a mechanical water pump and an air-cooling device: In some implementations, the first post-operation parameters of the engine system are determined based on ambient temperature, average coolant temperature, and average exhaust temperature, including: determining the first post-operation duration of the engine, the first engine speed and engine torque, and the second post-operation duration of the air-cooling device based on the ambient temperature, average coolant temperature, average exhaust temperature, and a preset first correspondence; the first correspondence is the relationship between the test ambient temperature, engine coolant temperature and exhaust temperature, engine post-operation duration, speed and torque, and air-cooling device post-operation duration obtained through pre-testing; and the first post-operation parameters are determined based on the first post-operation duration, the first engine speed, the engine torque, and the second post-operation duration.

[0046] In some embodiments, the first correspondence is obtained in advance through the following experimental steps: Under the test ambient temperature, the test vehicle is controlled to enter the test state, where the engine coolant temperature of the test vehicle reaches the preset test coolant temperature and the engine exhaust temperature of the test vehicle reaches the preset test exhaust temperature; while the test vehicle is in the test state, the air-cooling device of the test vehicle is controlled to run for a preset test duration, and the engine of the test vehicle is controlled to run at a preset test speed and a preset test torque, and the engine's subsequent running time is recorded when the coolant temperature of the turbocharger in the test vehicle drops to a preset temperature threshold; based on the test ambient temperature, preset test coolant temperature, preset test exhaust temperature, preset test speed, preset test torque, preset test duration, and the engine's subsequent running time, the first correspondence is obtained.

[0047] It should be noted that the timing of the engine's subsequent operation duration for the test vehicle begins when the test vehicle is in the test state and the engine is running at the preset test speed and preset test torque.

[0048] It should be noted that during the test, the ambient temperature in the standard vehicle environment chamber can be 25℃ or 45℃. The test can be conducted by driving at a fixed speed until the vehicle reaches thermal equilibrium, causing the engine coolant temperature to reach a preset test temperature, which can be 90℃ or 110℃. Alternatively, the engine exhaust temperature can be controlled by adjusting the engine speed and load to reach a preset test exhaust temperature, which can be 700℃, 750℃, 800℃, 850℃, 900℃, or 950℃. Throughout this process, the coolant temperature at the turbocharger outlet is continuously monitored. Once the engine exhaust temperature and engine coolant temperature stabilize (approximately 1 minute), the engine can be forced to run at a fixed speed and torque for t seconds (e.g., 3000 r / min, 10 Nm) and then stopped. Simultaneously, the cooling fan is forcibly activated for 60 seconds. The maximum value of the turbocharger outlet coolant temperature reached under different subsequent running times is recorded, and the running time corresponding to a turbocharger outlet coolant temperature of 135℃ is taken as the maximum value.

[0049] The first correspondence can include multiple sub-relationships, as shown in the following examples: First sub-relationship: Ambient temperature is 25℃, average water temperature is 90℃, average exhaust temperature is 700℃, first engine run duration is 0s, first engine speed is 3000r / min, engine torque is 10Nm, second run duration of the air-cooled device is 60s; Second sub-relationship: Ambient temperature is 25℃, average water temperature is 90℃, average exhaust temperature is 750℃, first engine run duration is 2s, first engine speed is 3000r / min, engine torque is 10Nm, second run duration of the air-cooled device is 60s; Third sub-relationship: Ambient temperature is 25℃, average water temperature is 90℃, average exhaust temperature is 800℃, first engine run duration is 4s, first engine speed is 3000r / min, engine torque is 10Nm, second run duration of the air-cooled device is 60s.

[0050] In the second case, the engine system's water pump is a mechanical water pump. The first correspondence is essentially determined by looking up a table to determine the operating parameters. Alternatively, the operating parameters can also be determined by mathematical formulas, as explained below: In other embodiments, the first post-operation parameters of the engine system are determined based on ambient temperature, average coolant temperature, and average exhaust temperature, including: inputting the ambient temperature, average coolant temperature, and average exhaust temperature into a preset first mathematical formula to obtain the first post-operation duration of the engine, the first engine speed and engine torque, and the second post-operation duration of the air-cooling device; the first mathematical formula is a mathematical relationship between the test ambient temperature, the engine coolant temperature and exhaust temperature, the post-operation duration of the engine, the speed and torque, and the post-operation duration of the air-cooling device; and the first post-operation parameters are determined based on the first post-operation duration, the first engine speed, the engine torque, and the second post-operation duration.

[0051] In some implementations, the first post-running parameter is determined based on the first post-running duration, the first engine speed, the engine torque, and the second post-running duration. This can be achieved by using the first post-running duration, the first engine speed, the engine torque, and the second post-running duration as the first post-running parameter.

[0052] It should be noted that directly using the first post-run duration, the first engine speed, the engine torque, and the second post-run duration as the first post-run parameters avoids more complex processing and reduces the complexity of post-run control.

[0053] In other embodiments, determining the first post-running parameters based on the first post-running duration, the first engine speed, the engine torque, and the second post-running duration includes: acquiring the vehicle speed of the target vehicle; correcting the first engine speed and the first post-running duration based on the vehicle speed to obtain the first post-running parameters; the first post-running parameters include the engine torque and the second post-running duration.

[0054] In some implementations, the first engine speed and the first post-run duration are corrected based on the vehicle speed to obtain the first post-run parameters, including: correcting the first engine speed based on the vehicle speed to obtain the second engine speed; correcting the first post-run duration based on the difference between the first engine speed and the second engine speed to obtain the third post-run duration; and using the third post-run duration, the second engine speed, the engine torque, and the second post-run duration as the first post-run parameters.

[0055] It should be noted that if the speed of the first engine is less than that of the second engine, the third engine running time needs to be obtained by reducing the first running time; if the speed of the first engine is greater than that of the second engine, the third engine running time needs to be obtained by increasing the first running time.

[0056] In some implementations, the first engine speed is corrected based on the vehicle speed to obtain the second engine speed, including: determining an upper limit threshold for the engine speed based on the vehicle speed; if the first engine speed is greater than the upper limit threshold, using the upper limit threshold as the second engine speed; if the first engine speed is less than the upper limit threshold, using a speed value between the first engine speed and the upper limit threshold as the second engine speed.

[0057] In some implementations, the upper limit threshold for engine speed is determined based on vehicle speed. For example, if the vehicle speed is 0 km / h to 20 km / h, the upper limit threshold for engine speed can be 3000 r / min; if the vehicle speed is 20 km / h to 60 km / h, the upper limit threshold for engine speed can be 3500 r / min; if the vehicle speed is 60 km / h to 90 km / h, the upper limit threshold for engine speed can be 4000 r / min; and if the vehicle speed is greater than 90 km / h, the upper limit threshold for engine speed can be 5000 r / min.

[0058] In some implementations, a speed value between the first engine speed and the upper limit threshold speed is used as the second engine speed. This can be achieved by using the upper limit threshold speed as the second engine speed.

[0059] It's important to note that when the engine system includes a mechanical water pump, as engine speed increases, its NVH (Noise, Vibration, and Harshness) performance deteriorates, resulting in a poorer user experience. However, during high-speed driving, the increased background noise (such as tire noise and wind noise) reduces the impact of high-speed engine noise. In short, the higher the vehicle speed, the higher the acceptable engine speed for the customer. For example, in a parked scenario, an engine speed exceeding 3000 rpm will result in noticeably loud engine compartment noise. However, at 120 km / h, even with an engine speed reaching 5000 rpm, the user will not perceive significant noise (because tire and wind noise are significantly stronger than engine noise at this speed). Therefore, determining an upper limit threshold for engine speed based on vehicle speed can prevent the vehicle from generating noise that severely impacts user comfort, thereby improving vehicle comfort. Furthermore, the upper limit threshold also ensures a reasonable engine speed, allowing for faster reduction of the turbocharger's coolant temperature, thus achieving a balance between improving vehicle comfort and reducing the possibility of the engine system's radiator melting.

[0060] S104: Based on the first post-operation parameters, control the post-operation of the engine system to ensure that the coolant temperature of the turbocharger is lower than a preset temperature threshold.

[0061] It should be noted that "post-operation" refers to the engine system continuing to run after the engine receives a shutdown command. The "post-operation duration" parameter refers to the duration for which the corresponding component continues to operate after the engine receives a shutdown command; this component could be the engine, electric water pump, or fan. The "speed" parameter refers to the speed at which the corresponding component continues to operate after the engine receives a shutdown command; this component could be the engine or electric water pump. The "torque" parameter refers to the torque at which the engine continues to operate after receiving a shutdown command.

[0062] It's worth noting that in hybrid SUVs, the hybrid engine often enhances turbocharger performance to achieve maximum power. Exhaust temperature is a crucial limit to turbocharger performance; current exhaust temperatures are typically capped at 950°C, while newer hybrid engines often reach 1050°C. The turbocharger is usually cooled via a cooling branch on top of the engine. The turbocharger's water jacket capacity is generally around 30ml. In actual operation, the coolant temperature flowing through the turbocharger is generally below 118°C, and the boiling point of the coolant (at a system pressure of 1.4 Bar) generally does not exceed 135°C.

[0063] This invention, in response to an engine shutdown command, determines a first pre-operational time period's engine coolant temperature sequence and engine exhaust temperature sequence based on the engine coolant temperature and exhaust temperature. Based on these sequences, it determines first post-operational parameters for the engine system to control its subsequent operation, ensuring the turbocharger's coolant temperature remains below a preset temperature threshold. The turbocharger's coolant originates from the engine's main water channel; higher engine coolant temperatures result in hotter coolant entering the turbocharger, thus exhibiting a strong correlation between turbocharger coolant temperature and engine coolant temperature. Simultaneously, higher exhaust temperatures lead to higher turbine housing temperatures, directly heating the turbocharger's bearing housing and water jacket. Therefore, most of the turbocharger's coolant heat originates from engine exhaust, again demonstrating a strong correlation between turbocharger coolant temperature and engine exhaust temperature. Thus, this invention, by combining engine exhaust and coolant temperatures, more accurately reflects the turbocharger's coolant temperature, thereby precisely determining the post-operational strategy and reducing the likelihood of the engine system's radiator melting. In addition, the embodiments of the present invention reflect the coolant temperature of the turbocharger by using the engine water temperature sequence and the engine exhaust temperature sequence of the first preceding period, avoiding the need to reflect the coolant temperature of the turbocharger by using only the engine water temperature or engine exhaust temperature at a single moment. This allows for a more accurate reflection of the coolant temperature of the turbocharger, thus enabling accurate control of subsequent operation to meet cooling requirements and reducing the possibility of the engine system's water tank melting.

[0064] Based on the same inventive concept, and referring to Figure 2As shown, this embodiment of the invention provides an engine system post-operation control device 10. The engine system includes an engine and a turbocharger. The engine system post-operation control device 10 includes: a monitoring unit 110, used to monitor the engine coolant temperature and engine exhaust temperature during engine operation of a target vehicle; a response unit 120, used to determine the engine coolant temperature sequence and engine exhaust temperature sequence for a first preceding time period based on the engine coolant temperature and engine exhaust temperature in response to the engine receiving a stop command, the first preceding time period being the period before the engine receives the stop command; a parameter determination unit 130, used to determine the first post-operation parameters of the engine system based on the engine coolant temperature sequence and engine exhaust temperature sequence; and a post-operation control unit 140, used to control the post-operation of the engine system based on the first post-operation parameters to ensure that the coolant temperature of the turbocharger is lower than a preset temperature threshold.

[0065] It is understood that the engine system post-operation control device 10 also includes: a temperature acquisition unit, used to acquire the ambient temperature of the environment where the engine system is located before the engine receives a shutdown command; and a parameter determination unit 130, specifically used to: determine the first post-operation parameters of the engine system based on the ambient temperature, the engine coolant temperature sequence, and the engine exhaust temperature sequence.

[0066] Specifically, the parameter determination unit 130 includes: a water temperature determination subunit, used to determine the average water temperature of the engine in the first preceding period based on the engine water temperature sequence; an exhaust temperature determination subunit, used to determine the average exhaust temperature of the engine in the first preceding period based on the engine exhaust temperature sequence; and a subsequent operation subunit, used to determine the first subsequent operation parameters of the engine system based on the ambient temperature, average water temperature, and average exhaust temperature.

[0067] In some embodiments, the engine system further includes an electric water pump and an air-cooling device; the post-operation subunit is specifically used to: determine the first post-operation duration and water pump speed of the electric water pump, and the second post-operation duration of the air-cooling device, based on the ambient temperature, average water temperature, average exhaust temperature, and a preset first correspondence; the first correspondence is the relationship between the test ambient temperature, engine water temperature and exhaust temperature, the post-operation duration and speed of the electric water pump, and the post-operation duration of the air-cooling device, obtained through pre-testing; and determine the first post-operation parameters based on the first post-operation duration, water pump speed, and second post-operation duration.

[0068] In other embodiments, the engine system further includes a mechanical water pump and an air-cooling device; the post-operation subunit is specifically used for: determining a first post-operation duration, a first engine speed and engine torque, and a second post-operation duration of the air-cooling device based on ambient temperature, average coolant temperature, average exhaust temperature, and a preset first correspondence; the first correspondence is the relationship between the test ambient temperature, engine coolant temperature and exhaust temperature, engine post-operation duration, speed and torque, and air-cooling device post-operation duration obtained through pre-testing; and determining first post-operation parameters based on the first post-operation duration, the first engine speed, the engine torque, and the second post-operation duration. Specifically, determining the first post-operation parameters based on the first post-operation duration, the first engine speed, the engine torque, and the second post-operation duration includes: acquiring the target vehicle speed; correcting the first engine speed and the first post-operation duration based on the vehicle speed to obtain the first post-operation parameters; the first post-operation parameters include engine torque and the second post-operation duration. The process involves correcting the first engine speed and the first post-run duration based on vehicle speed to obtain first post-run parameters. This includes: correcting the first engine speed based on vehicle speed to obtain a second engine speed; correcting the first post-run duration based on the difference between the first and second engine speeds to obtain a third post-run duration; and using the third post-run duration, the second engine speed, the engine torque, and the second post-run duration as the first post-run parameters. Specifically, correcting the first engine speed based on vehicle speed to obtain the second engine speed includes: determining an upper speed limit threshold based on vehicle speed; if the first engine speed is greater than the upper speed limit threshold, using the upper speed limit threshold as the second engine speed; if the first engine speed is less than the upper speed limit threshold, using a speed value between the first engine speed and the upper speed limit threshold as the second engine speed.

[0069] In some embodiments, the engine system post-operation control device 10 further includes: a first establishment unit, used to pre-test and obtain a first correspondence through the following test steps, including: controlling the test vehicle to enter a test state under test ambient temperature, wherein the test state is that the engine coolant temperature of the test vehicle reaches a preset test coolant temperature and the engine exhaust temperature of the test vehicle reaches a preset test exhaust temperature; while the test vehicle is in the test state, controlling the air-cooling device of the test vehicle to run for a preset test duration and controlling the electric water pump of the test vehicle to run at a preset test speed, and recording the post-operation duration of the electric water pump of the test vehicle when the coolant temperature of the turbocharger in the test vehicle drops to a preset temperature threshold; and obtaining the first correspondence based on the test ambient temperature, preset test coolant temperature, preset test exhaust temperature, preset test speed, preset test duration, and post-operation duration of the electric water pump of the test vehicle.

[0070] In some embodiments, the engine system post-run control device 10 further includes: a first establishment unit, used to pre-test and obtain a first correspondence through the following test steps, including: controlling the test vehicle to enter a test state under test ambient temperature, wherein the test state is that the engine coolant temperature of the test vehicle reaches a preset test coolant temperature and the engine exhaust temperature of the test vehicle reaches a preset test exhaust temperature; while the test vehicle is in the test state, controlling the air-cooling device of the test vehicle to run for a preset test duration, and controlling the engine of the test vehicle to run at a preset test speed and a preset test torque, and recording the post-run duration of the engine of the test vehicle when the coolant temperature of the turbocharger in the test vehicle drops to a preset temperature threshold; obtaining the first correspondence based on the test ambient temperature, preset test coolant temperature, preset test exhaust temperature, preset test speed, preset test torque, preset test duration, and post-run duration of the engine of the test vehicle.

[0071] It should be understood that further implementation details of the engine system post-operation control device 10 in the embodiments of the present invention are described in the foregoing engine system post-operation control method, and will not be repeated here for the sake of brevity.

[0072] Based on the same inventive concept, embodiments of the present invention also provide an electronic device, such as... Figure 3 As shown, it includes a memory 304, a processor 302, and a computer program stored in the memory 304 and executable on the processor 302. The processor 302 executes the program to implement the steps described in any embodiment of the engine system rear operation control method.

[0073] Among them, Figure 3 In this document, a bus architecture (represented by bus 300) is used. Bus 300 may include any number of interconnected buses and bridges, linking various circuits including one or more processors represented by processor 302 and memory represented by memory 304. Bus 300 may also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. Bus interface 305 provides an interface between bus 300 and receiver 301 and transmitter 303. Receiver 301 and transmitter 303 may be the same element, i.e., a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 302 is responsible for managing bus 300 and general processing, while memory 304 can be used to store data used by processor 302 during operation.

[0074] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions can be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and embodiments are within the scope and spirit of this invention and the appended claims. For example, due to the nature of software, the functions described above can be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Furthermore, the functional units can be integrated into a single processing unit, or each unit can exist physically separately, or two or more units can be integrated into a single unit.

[0075] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0076] The units described as separate components may or may not be physically separate. Similarly, the components of the control device may or may not be physical units; they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0077] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0078] The above description is merely an embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A method for controlling the operation of an engine system after it has been put into operation, characterized in that, The engine system includes an engine and a turbocharger; the method includes: During the engine operation of the target vehicle, monitor the engine coolant temperature and engine exhaust temperature; In response to the engine receiving a shutdown command, the engine coolant temperature sequence and the engine exhaust temperature sequence for a first preceding period are determined based on the engine coolant temperature and the engine exhaust temperature. The first preceding period is the period before the engine receives the shutdown command. Based on the engine coolant temperature sequence and the engine exhaust temperature sequence, the first subsequent operating parameters of the engine system are determined; Based on the first post-operation parameters, the post-operation of the engine system is controlled so that the coolant temperature of the turbocharger is lower than a preset temperature threshold.

2. The engine system post-operation control method according to claim 1, characterized in that, Also includes: Before the engine receives the shutdown command, the ambient temperature of the environment where the engine system is located is obtained; The determination of the first post-operational parameters of the engine system based on the engine coolant temperature sequence and the engine exhaust temperature sequence includes: Based on the ambient temperature, the engine coolant temperature sequence, and the engine exhaust temperature sequence, the first post-operation parameters of the engine system are determined.

3. The engine system post-operation control method according to claim 2, characterized in that, The determination of the first post-operational parameters of the engine system based on the ambient temperature, the engine coolant temperature sequence, and the engine exhaust temperature sequence includes: Based on the engine coolant temperature sequence, the average coolant temperature of the engine during the first preceding time period is determined; Based on the engine exhaust temperature sequence, the average exhaust temperature of the engine during the first preceding period is determined; Based on the ambient temperature, the average water temperature, and the average exhaust temperature, the first post-operational parameters of the engine system are determined.

4. The engine system post-operation control method according to claim 3, characterized in that, The engine system also includes an electric water pump and an air-cooling device; The determination of the first post-operational parameters of the engine system based on the ambient temperature, the average water temperature, and the average exhaust temperature includes: Based on the ambient temperature, the average water temperature, the average exhaust temperature, and a preset first correspondence, the first post-run duration and pump speed of the electric water pump, and the second post-run duration of the air-cooling device are determined; the first correspondence is the relationship between the test ambient temperature, engine water temperature and exhaust temperature, the post-run duration and speed of the electric water pump, and the post-run duration of the air-cooling device, obtained through pre-testing. The first post-running parameters are determined based on the first post-running duration, the water pump speed, and the second post-running duration.

5. The engine system post-operation control method according to claim 3, characterized in that, The engine system also includes a mechanical water pump and an air-cooling device; The determination of the first post-operational parameters of the engine system based on the ambient temperature, the average water temperature, and the average exhaust temperature includes: Based on the ambient temperature, the average water temperature, the average exhaust temperature, and a preset first correspondence, the first post-run duration of the engine, the first engine speed and engine torque, and the second post-run duration of the air-cooling device are determined; the first correspondence is the relationship between the test ambient temperature, engine water temperature and exhaust temperature, engine post-run duration, speed and torque, and air-cooling device post-run duration obtained through pre-testing. The first post-running parameters are determined based on the first post-running duration, the first engine speed, the engine torque, and the second post-running duration.

6. The engine system post-operation control method according to claim 5, characterized in that, The determination of the first post-running parameters based on the first post-running duration, the first engine speed, the engine torque, and the second post-running duration includes: Obtain the speed of the target vehicle; The first engine speed and the first post-run duration are corrected based on the vehicle speed to obtain the first post-run parameters; the first post-run parameters include the engine torque and the second post-run duration.

7. The engine system post-operation control method according to claim 6, characterized in that, The step of correcting the first engine speed and the first post-run duration based on the vehicle speed to obtain the first post-run parameters includes: The first engine speed is corrected based on the vehicle speed to obtain the second engine speed; Based on the difference between the first engine speed and the second engine speed, the first post-run duration is corrected to obtain the third post-run duration of the engine. The third post-run duration, the second engine speed, the engine torque, and the second post-run duration are used as the first post-run parameters.

8. The engine system post-operation control method according to claim 7, characterized in that, The step of correcting the first engine speed based on the vehicle speed to obtain the second engine speed includes: Based on the vehicle speed, determine the upper limit threshold of the rotational speed; If the speed of the first engine is greater than the upper limit threshold, the upper limit threshold is used as the speed of the second engine; If the speed of the first engine is less than the upper limit threshold, the speed value between the speed of the first engine and the upper limit threshold is taken as the speed of the second engine.

9. The engine system post-operation control method according to claim 4, characterized in that, The first correspondence was obtained in advance through the following experimental steps: Under the test ambient temperature, the test vehicle is controlled to enter the test state, which is when the engine coolant temperature of the test vehicle reaches the preset test coolant temperature and the engine exhaust temperature of the test vehicle reaches the preset test exhaust temperature. While the test vehicle is in the test state, the air-cooling device of the test vehicle is controlled to run for a preset test duration, and the electric water pump of the test vehicle is controlled to run at a preset test speed. The running time of the electric water pump of the test vehicle is recorded when the coolant temperature of the turbocharger in the test vehicle drops to the preset temperature threshold. The first correspondence is obtained based on the test environment temperature, the preset test water temperature, the preset test exhaust temperature, the preset test speed, the preset test duration, and the subsequent running time of the electric water pump of the test vehicle.

10. The engine system post-operation control method according to any one of claims 5-8, characterized in that, The first correspondence was obtained in advance through the following experimental steps: Under the test ambient temperature, the test vehicle is controlled to enter the test state, which is when the engine coolant temperature of the test vehicle reaches the preset test coolant temperature and the engine exhaust temperature of the test vehicle reaches the preset test exhaust temperature. While the test vehicle is in the test state, the air-cooling device of the test vehicle is controlled to run for a preset test duration, and the engine of the test vehicle is controlled to run at a preset test speed and a preset test torque. The engine running time of the test vehicle is recorded when the coolant temperature of the turbocharger in the test vehicle drops to the preset temperature threshold. The first correspondence is obtained based on the test environment temperature, the preset test water temperature, the preset test exhaust temperature, the preset test speed, the preset test torque, the preset test duration, and the engine's subsequent running time of the test vehicle.

11. A post-operation control device for an engine system, characterized in that, The engine system includes an engine and a turbocharger; the device includes: The monitoring unit is used to monitor the engine coolant temperature and engine exhaust temperature during the operation of the engine of the target vehicle. A response unit is configured to, in response to the engine receiving a stop command, determine an engine coolant temperature sequence and an engine exhaust temperature sequence for a first preceding period based on the engine coolant temperature and the engine exhaust temperature, wherein the first preceding period is the period before the engine receives the stop command; The parameter determination unit is used to determine the first post-operation parameters of the engine system based on the engine coolant temperature sequence and the engine exhaust temperature sequence. The post-operation control unit is used to control the post-operation of the engine system based on the first post-operation parameters, so that the coolant temperature of the turbocharger is lower than a preset temperature threshold.

12. An electronic device, characterized in that, include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method of any one of claims 1-10.

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