A method, device, storage medium, and electronic device for determining engine characteristics

Abstract

Embodiments of the present disclosure disclose a method, device, storage medium, and electronic device for determining engine characteristics. Among them, the determination method includes: determining the indicated torque of the engine based on the gear position and the engine speed; determining the engine loss torque based on the engine speed; and determining the engine characteristics of the engine based on the indicated torque and the engine loss torque, where the engine characteristics at least include the external characteristic torque of the engine and / or the transmission efficiency of the transmission system. Embodiments of the present disclosure, based on the state of the whole vehicle, obtain the external characteristic parameters of the engine through devices such as cylinder pressure sensors and combustion analyzers, and in combination with chassis dynamometer tests; obtain the transmission efficiency of the transmission system based on the engine output power and the chassis dynamometer wheel side test power, overcome the influence of environmental parameters on the results, and the obtained results are more accurate, providing an effective reference boundary for the power matching of the engine.

Description

Technical Field

[0001] The present disclosure relates to the technical field of automotive engine power development. Specifically, it relates to a method, device, storage medium, and electronic device for determining engine characteristics. Background Art

[0002] The measurement of the engine's external characteristics and transmission efficiency is an important task during the engine research and development and verification processes. Currently, the method of using a bench dynamometer for external characteristic testing by engine research and development units has been mature. The external characteristic test data has been widely used by the vehicle CAE department for vehicle performance calculation and matching. However, due to the different environments in which the engine is located under vehicle driving conditions, such as the distribution of the front cabin temperature field, the influence of the air intake port on the engine intake and exhaust temperatures, and the influence of the air intake port position on the engine intake air volume, the performance of the engine under vehicle operating conditions cannot be consistent with the performance parameters obtained through bench tests. At the same time, due to the limitations of the product benchmarking work in terms of development cycle, cost, and technical feasibility, we cannot obtain the external characteristic data of the benchmark model engine and the transmission efficiency data of the transmission system through bench tests.

[0003] The existing patent document 1 (CN201510834836.6) discloses a method for testing the external characteristics of an engine based on the vehicle environment, and specifically discloses: initializing the vehicle to meet the test requirements; calculating the theoretical vehicle speed V corresponding to different engine speeds; preheating the roller, setting the environmental temperature, fixing the vehicle, and warming up the vehicle; inputting the theoretical vehicle speed V on the roller control interface, and obtaining the actual vehicle speed V' by monitoring the engine speed and continuously adjusting the input vehicle speed; collecting the wheel-side power P0 when the vehicle is in gear and the wheel-side power P1 when the vehicle is in neutral at each actual speed V'; calculating the engine power P and the engine torque Tq to obtain the engine external characteristic curve. In the above document, the wheel-side power measured on the roller test in the in-gear state and the neutral state is used as the actual output power of the engine, which will result in a smaller obtained engine power. During the neutral coasting and in-gear positive torque transmission processes, due to the large difference in the transmitted torque, there are differences in the power losses of the transmission system, and the power losses will increase with the increase in the transmitted torque. This further leads to a large difference between the obtained engine power and the actual power, and accurate engine external characteristic data cannot be obtained. Summary of the Invention

[0004] Embodiments of the present disclosure provide a method, device, storage medium, and electronic device for determining engine characteristics, so as to at least solve the technical problem that the data obtained by the existing engine characteristic testing method has a large difference from the actual situation and the engine characteristics cannot be accurately obtained.

[0005] According to one aspect of the embodiments of the present disclosure, a method for determining engine characteristics is provided, including: determining the indicated torque of the engine based on the gear position and the engine speed; determining the engine loss torque based on the engine speed; and determining the engine characteristics of the engine based on the indicated torque and the engine loss torque, where the engine characteristics at least include the external characteristic torque of the engine and / or the transmission efficiency of the transmission system.

[0006] In an exemplary embodiment, the determining the indicated torque of the engine based on the gear position and the engine speed includes: determining the indicated torque of the engine and the full-throttle indicated torque at different gear positions and different engine speeds.

[0007] In an exemplary embodiment, the determining the indicated torque of the engine at different gear positions and different engine speeds includes determining a first indicated torque at a fixed gear position and a fixed engine speed; and / or determining a second indicated torque at a fixed gear position and different engine speeds; and / or determining a third indicated torque at different gear positions and different engine speeds.

[0008] In an exemplary embodiment, the determining the engine loss torque based on the engine speed includes: determining a first drag torque at different engine speeds based on a neutral coast-down test; determining a second drag torque at different engine speeds based on a in-gear test; and determining the engine loss torque at different engine speeds based on the first drag torque, the second drag torque, and the transmission ratio of the transmission system.

[0009] In an exemplary embodiment, the determining a first drag torque at different engine speeds based on a neutral coast-down test includes: obtaining the neutral coast-down force during the vehicle coasting in neutral; and determining the first drag torque based on the neutral coast-down force and the tire rolling radius of the vehicle.

[0010] In an exemplary embodiment, the determining a second drag torque at different engine speeds based on a in-gear test includes: obtaining the in-gear coast-down force during the vehicle coasting in gear; and determining the second drag torque based on the in-gear coast-down force and the tire rolling radius of the vehicle.

[0011] In an exemplary embodiment, the determining the engine loss torque at different engine speeds based on the first drag torque, the second drag torque, and the transmission ratio of the transmission system includes: determining the wheel-end loss torque based on the first drag torque and the second drag torque; and determining the engine loss torque based on the wheel-end loss torque and the transmission ratio.

[0012] In an exemplary embodiment, determining the external characteristic torque of the engine based on the indicated torque and the loss torque includes: determining the external characteristic torque of the engine at different rotational speeds based on the full-throttle indicated torque and the engine loss torque.

[0013] In an exemplary embodiment, determining the transmission efficiency of the transmission system based on the indicated torque and the loss torque includes: determining the output net torque based on the gear position and the engine speed based on the indicated torque and the loss torque; determining the wheel-end power of the vehicle based on a hub test; and determining the transmission efficiency based on the output net torque, the engine speed, and the wheel-end power.

[0014] In a second aspect, an embodiment of the present disclosure further provides a device for determining engine characteristics, including:

[0015] An indicated torque determination module, configured to determine the indicated torque of the engine based on the gear position and the engine speed; a torque loss determination module, configured to determine the engine loss torque based on the engine speed; and an engine characteristic determination module, configured to determine the engine characteristics of the engine based on the indicated torque and the engine loss torque, where the engine characteristics at least include the external characteristic torque of the engine and / or the transmission efficiency of the transmission system.

[0016] In a third aspect, an embodiment of the present disclosure further provides a computer-readable storage medium, where the storage medium stores a computer program, and the computer program is used to execute the method for determining engine characteristics described in any of the above technical solutions.

[0017] In a fourth aspect, an embodiment of the present disclosure further provides an electronic device, where the electronic device includes: a processor; a memory for storing executable instructions of the processor; and the processor is configured to execute the method for determining engine characteristics described in any of the above technical solutions.

[0018] As can be seen from the above, in the embodiments of the present disclosure, based on the state of the entire vehicle, external characteristic parameters of the engine are obtained through devices such as a cylinder pressure sensor and a combustion analyzer, and in combination with a chassis dynamometer test; the transmission efficiency of the transmission system is obtained based on the engine output power and the chassis dynamometer wheel-end test power, overcoming the influence of environmental parameters on the results, and the obtained results are more accurate, providing an effective reference boundary for the power matching of the engine.

[0019] To make the above objects, features, and advantages of the present disclosure more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes a detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 is a schematic diagram of the steps of the method for determining the engine characteristics provided by the present disclosure;

[0022] Figure 2 is a schematic diagram of the installation and connection of the engine test sensors provided by the present disclosure;

[0023] Figure 3 is a schematic diagram of the steps for determining the indicated torque of the engine provided by the present disclosure;

[0024] Figure 4 is a schematic diagram of the steps for determining the lost torque of the engine provided by the present disclosure;

[0025] Figure 5 is a schematic diagram of the steps for determining the transmission efficiency provided by the present disclosure;

[0026] Figure 6 is a structural block diagram of the device for determining the engine characteristics provided by the present disclosure;

[0027] Figure 7 is a structural block diagram of the electronic device provided by the present disclosure. Detailed Embodiments

[0028] Next, specific embodiments of the present disclosure will be described in detail with reference to the drawings, but this is not a limitation of the present disclosure.

[0029] It should be understood that various modifications can be made to the embodiments disclosed herein. Therefore, the above description should not be regarded as a limitation, but only as an example of the embodiments. Those skilled in the art will think of other modifications within the scope and spirit of the present disclosure.

[0030] The drawings included in the specification and constituting a part of the specification illustrate the embodiments of the present disclosure, and together with the general description of the present disclosure given above and the detailed description of the embodiments given below, are used to explain the principles of the present disclosure.

[0031] These and other features of the present disclosure will become apparent from the following description of the preferred forms of the embodiments given by way of non-limiting examples with reference to the drawings.

[0032] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present disclosure, which have the features as described in the claims and thus are all within the protection scope defined thereby.

[0033] When combined with the accompanying drawings, the above and other aspects, features and advantages of the present disclosure will become more apparent in view of the following detailed description.

[0034] Specific embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the disclosed embodiments are merely examples of the present disclosure, which can be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details disclosed herein are not intended to be limiting, but merely as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in substantially any suitable detailed structure in a variety of ways.

[0035] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", which may each refer to one or more of the same or different embodiments according to the present disclosure.

[0036] The present disclosure will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] Embodiment 1

[0038] The first embodiment of the present disclosure is used in the field of engine performance testing, and specifically relates to a method for determining engine characteristics based on the vehicle environment. Here, the engine characteristics are a comprehensive reflection of engine performance, and at least include the external characteristic torque of the engine and / or the transmission efficiency of the transmission system.

[0039] The embodiment of the present disclosure can utilize devices such as cylinder pressure sensors and combustion analyzers, and combine the engine output power and the dynamometer test and the power test at the wheel side of the dynamometer to obtain the external characteristic parameters of the engine and the transmission efficiency of the transmission system. As Figure 1 shown, the determination method includes the following steps:

[0040] S101, determining the indicated torque of the engine based on the gear position and the engine speed.

[0041] In this step, the indicated torque of the engine is determined based on the gear position and the engine speed. Among them, the indicated torque of the engine refers to the work done in one reciprocation during the reciprocating motion of the piston in the cylinder, and its unit is Newton-meter. In the present disclosure, the torque of the engine is obtained based on the indicated mean effective pressure of the engine.

[0042] Specifically, the mean indicated pressure imep of the vehicle engine is obtained by introducing the cylinder pressure sensor signal and the crankshaft position sensor signal into the combustion analyzer, and the indicated torque of the engine is obtained according to the following formula (1). Wherein, the connection relationships of the test devices such as the cylinder pressure sensor and the crankshaft position sensor are as Figure 2 shown. The cylinder pressure sensor is connected to the compression pipe with an adapter joint, and the compression pipe is screwed into the spark plug hole to seal the combustion chamber of the engine, so as to obtain the pressure signal in the engine cylinder. The crankshaft position sensor is installed on the crankshaft of the target vehicle to obtain the crankshaft angle signal of the engine.

[0043]

[0044] Wherein, V dis is the engine displacement, imep is the indicated mean pressure; T is the indicated torque.

[0045] Specifically, the indicated mean pressure is a parameter for evaluating the utilization rate of the working volume of the engine cylinder from the perspective of the actual cycle, and the actual cycle of the engine necessarily needs to consider the gear position of the vehicle and the torque of the engine. Therefore, determining the indicated torque of the engine based on the gear position and the engine speed further includes: determining the indicated torque and the wide-open throttle indicated torque of the engine at different gear positions and different engine speeds, where when the throttle opening is 100%, the indicated torque is also called the wide-open throttle indicated torque. As Figure 3 shown, determining the indicated torque of the engine includes the following steps:

[0046] S201, determine the first indicated torque at a fixed gear position and a fixed engine speed.

[0047] In this step, the first indicated torque at a fixed gear position and engine speed is tested based on the hub test. During the test, push the transmission shift lever of the vehicle into the manual mode position, fix the vehicle gear position, and set the roller to the constant speed mode; by adjusting the roller, the vehicle is made to reach a pre-set vehicle speed, so as to obtain a fixed engine speed; wherein, the engine speed is output by the combustion analyzer. At this time, the vehicle is in the working condition of a fixed gear position and vehicle speed. By gradually increasing the throttle pedal opening, the indicated torque of the engine corresponding to different throttle openings at the same speed can be obtained, and at the same time, the wheel-end power data of the vehicle wheel-end is recorded in real time by the roller.

[0048] Furthermore, for a vehicle transmission with a torque converter, select a gear with a locking function, usually a gear of 3rd gear or above; for a vehicle with a manual transmission, any gear of the vehicle can be selected; for a vehicle with a dual-clutch automatic transmission (DCT), any gear of the vehicle can be selected after the rotational speeds are synchronized. At the same time, for a transmission with a torque converter, the engine speed generally takes a value above 1300 rpm.

[0049] S202. Determine the second indicated torque at a fixed gear and different engine speeds;

[0050] In this step, determine the second indicated torque at a fixed gear and different engine speeds. During the above first indicated torque test, in the hub constant speed mode, by changing the vehicle speed, different engine speeds are obtained, so as to measure the data of the indicated torque varying with the accelerator pedal at different engine speeds, and then the second indicated torque is obtained; at the same time, the total transmission ratio of the corresponding gear is calculated according to the vehicle speed and the engine speed.

[0051] S203. Determine the third indicated torque at different gears and different engine speeds.

[0052] In this step, determine the third indicated torque at different gears and different engine speeds. In the hub constant speed mode, first select different gears, and repeat the above steps S201 and S202 at different gears, so as to obtain the data of the indicated torque varying with the accelerator pedal at different gears and different engine speeds; at the same time, the total transmission ratio of different gears is calculated according to the vehicle speed and the engine speed.

[0053] Finally, obtain a summary table of the indicated torque results as follows:

[0054] Gear position Engine speed Indicated torque Full throttle indicated torque Overall gear ratio 3 <![CDATA[N1]]> <![CDATA[T 31 > <![CDATA[T max3 > <![CDATA[i1]]> 3 <![CDATA[N2]]> <![CDATA[T 32 > <![CDATA[T max3 > <![CDATA[i1]]> 3 <![CDATA[N3]]> <![CDATA[T 33 > <![CDATA[T max3 > <![CDATA[i1]]> … … … … 4 <![CDATA[N1]]> <![CDATA[T 41 > <![CDATA[T max4 > <![CDATA[i1]]> … … … … …

[0055] S102. Determine the engine loss torque based on the engine speed.

[0056] After determining the indicated torque of the engine through the above step S101, in this step, determine the engine loss torque based on the engine speed. The torque loss here refers to the inevitable torque loss during the operation of the engine, such as the frictional loss between the piston and the piston ring, the frictional loss between the bearing and the valve mechanism, the fluid frictional loss, etc.

[0057] Specifically, as Figure 4 shown, determining the loss torque of the engine includes the following steps:

[0058] S301. Determine the first drag torque at different engine speeds based on the neutral coasting test.

[0059] In this step, based on the neutral drag force and the tire rolling radius, the first drag torque of the vehicle at different engine speeds is determined.

[0060] First, obtain the neutral drag force during the neutral coasting of the vehicle. Specifically, place the vehicle engine in the idle state, set the gear to neutral, and use the roller to drag the vehicle in reverse to 130 km / h, then switch to the road load mode. The vehicle automatically decelerates and finally coasts to a lower speed, usually 20 km / h, and apply the brake until the vehicle stops; during the coasting process, the roller records the wheel-end reverse drag power and the neutral drag force of the vehicle in real time.

[0061] Second, determine the first drag torque based on the neutral drag force and the tire rolling radius of the vehicle. After obtaining the neutral drag force, the first drag torque of the vehicle at different engine speeds can be calculated, where,

[0062] The first drag torque = neutral drag force * tire rolling radius.

[0063] Furthermore, the tire rolling radius can be obtained based on the tire parameters through national standards such as GB / T - 2978 - 2014.

[0064] S302. Determine the second drag torque at different engine speeds based on the in-gear test.

[0065] After determining the first drag torque at different engine speeds through the above step S301, set the roller to the road load mode, fix the gear of the vehicle, and step on the accelerator to accelerate to near the maximum speed of the engine; then release the accelerator, and the vehicle coasts to a lower speed, usually 20 km / h, and apply the brake until the vehicle stops. During the coasting process, the roller records the in-gear wheel-end reverse drag power and the in-gear drag force of the vehicle in real time.

[0066] Then, determine the second drag torque based on the in-gear drag force and the tire rolling radius of the vehicle. After obtaining the in-gear drag force, the second drag torque of the vehicle at different engine speeds can be calculated, where,

[0067] The second drag torque = in-gear drag force * tire rolling radius.

[0068] Furthermore, the tire rolling radius can be obtained based on the tire parameters through national standards such as GB / T - 2978 - 2014.

[0069] S303. Determine the engine loss torque at different engine speeds based on the first drag torque, the second drag torque, and the transmission ratio of the transmission system.

[0070] After completing the above step S302, in this step, determine the loss torque of the engine based on the first drag torque, the second drag torque, and the transmission ratio of the transmission system. The specific steps are as follows:

[0071] First, based on the first drag torque and the second drag torque, determine the wheel-end loss torque. The wheel-end loss torque is calculated by the following formula:

[0072] Wheel-end loss torque = Second drag torque - First drag torque;

[0073] Thus, obtain the engine wheel-end loss torque of the engine at different speeds.

[0074] Second, based on the wheel-end loss torque and the transmission ratio, determine the engine loss torque. The engine loss torque is obtained by the following formula:

[0075] Engine loss torque = Wheel-end loss torque × Total transmission ratio I;

[0076] Thus, obtain the engine loss torque of the engine at different speeds.

[0077] S103. Based on the indicated torque and the engine loss torque, determine the engine characteristics of the engine. The engine characteristics at least include the engine's external characteristic torque and / or the transmission efficiency of the transmission system.

[0078] After obtaining the loss torque of the engine in the above step S102, in this step, determine the engine characteristics of the engine. Among them, the engine characteristics are a comprehensive reflection of the engine performance. The engine characteristics described in this disclosure at least include the engine's external characteristic torque and / or the transmission efficiency of the transmission system.

[0079] Among them, the engine external characteristic refers to the law of the power or torque measured at full load of the engine changing with the speed. Specifically, the engine's external characteristic torque refers to the external characteristic torque when the vehicle's throttle is fully open, and can be calculated by the following formula:

[0080] Engine external characteristic torque = Full-throttle indicated torque - Engine loss torque.

[0081] Among them, the transmission efficiency of the engine transmission system is obtained based on the indicated torque and loss torque of the engine. Specifically, as Figure 5As shown, determining the engine characteristics includes the following steps:

[0082] S401, determine the output net torque based on the gear position and the engine speed based on the indicated torque and the loss torque.

[0083] In this step, determine the output net torque of the engine based on the indicated torque and the loss torque, where

[0084] Output net torque of the engine = engine indicated torque - engine loss torque,

[0085] Thus, obtain the output net torque of the vehicle at different gear positions and engine speeds based on the indicated torque and the loss torque of the engine at different speeds in each gear of the vehicle.

[0086] S402, determine the wheel-end power of the vehicle based on the wheel hub test.

[0087] After obtaining the output net torque of the engine through the above step S401, determine the wheel-end power of the vehicle based on the wheel hub test, and the wheel-end power can also be obtained in the above step S101.

[0088] S403, determine the transmission efficiency based on the output net torque, the engine speed, and the wheel-end power.

[0089] After determining the wheel-end power of the vehicle through the above step S402, determine the transmission efficiency, where:

[0090]

[0091] Thus, obtain the transmission efficiency of each gear of the vehicle at different speeds and torques.

[0092] Based on the state of the whole vehicle, the embodiments of the present disclosure obtain the engine external characteristic parameters through devices such as cylinder pressure sensors and combustion analyzers, and combine with the chassis dynamometer test; obtain the transmission efficiency of the transmission system based on the engine output power and the chassis dynamometer wheel-end test power, overcome the influence of environmental parameters on the results, and the obtained results are more accurate, providing an effective reference boundary for the power matching of the engine.

[0093] Embodiment 2

[0094] To better implement the above method, the second aspect of the embodiments of the present disclosure further provides a control device for low-temperature start of a fuel cell system, and the control device can be integrated on an electronic device.

[0095] For example, as Figure 6As shown, the device for determining engine characteristics may include: an indicated torque determination module 210, a torque loss determination module 220, and an engine characteristic determination module 230, specifically as follows:

[0096] (1) The indicated torque determination module 210 is configured to determine the indicated torque of the engine based on the gear position and the engine speed.

[0097] Wherein, the indicated torque refers to the work done in one reciprocation of the piston during the reciprocating motion in the cylinder; specifically, the indicated torque determination module 210 includes:

[0098] A first indicated torque determination unit, configured to determine a first indicated torque at a fixed gear position and a fixed engine speed;

[0099] A second indicated torque determination unit, configured to determine a second indicated torque at a fixed gear position and different engine speeds;

[0100] A third indicated torque determination unit, configured to determine a third indicated torque at different gear positions and different engine speeds.

[0101] (2) The torque loss determination module 220 is configured to determine the engine loss torque based on the engine speed.

[0102] Wherein, the loss torque refers to the inevitable torque loss that occurs during the operation of the engine; specifically, the torque loss determination module 220 includes:

[0103] A first drag torque determination unit, configured to determine a first drag torque at different engine speeds based on a neutral coast-down test;

[0104] A second drag torque determination unit, configured to determine a second drag torque at different engine speeds based on a in-gear test;

[0105] An engine loss torque determination unit, configured to determine the engine loss torque at different engine speeds based on the first drag torque, the second drag torque, and the transmission ratio of the transmission system.

[0106] (3) The engine characteristic determination module 230 is configured to determine the engine characteristics of the engine based on the indicated torque and the engine loss torque; wherein, the engine characteristics at least include the external characteristic torque of the engine and / or the transmission efficiency of the transmission system. Specifically, the engine characteristic determination module includes:

[0107] An output net torque determination unit, configured to determine the output net torque based on the gear position and the engine speed based on the indicated torque and the loss torque;

[0108] A wheel-end power determination unit for determining the wheel-end power of a vehicle based on a wheel hub test;

[0109] A transmission efficiency determination unit for determining the transmission efficiency based on the output net torque, the engine speed, and the wheel-end power.

[0110] The engine characteristic determination device according to an embodiment of the present disclosure, based on the state of the whole vehicle, obtains engine external characteristic parameters through devices such as a cylinder pressure sensor and a combustion analyzer, and combines a chassis dynamometer test; obtains the transmission efficiency of the transmission system based on the engine output power and the chassis dynamometer wheel-end test power, overcomes the influence of environmental parameters on the results, and the obtained results are more accurate, providing an effective reference boundary for the power matching of the engine.

[0111] Embodiment 3

[0112] Those of ordinary skill in the art can understand that all or part of the steps in the above various methods of the embodiments can be completed by instructions, or by controlling relevant hardware through instructions. The instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0113] For this reason, a third aspect of the embodiments of the present disclosure provides a storage medium, which is a computer-readable medium and stores a computer program. When the computer program is executed by a processor, it implements the method provided by the embodiments of the present disclosure, including the following steps S11 to S13:

[0114] S11, determining the indicated torque of the engine based on the gear position and the engine speed;

[0115] S12, determining the engine loss torque based on the engine speed;

[0116] S13, determining the engine characteristics of the engine based on the indicated torque and the engine loss torque, where the engine characteristics at least include the external characteristic torque of the engine and / or the transmission efficiency of the transmission system.

[0117] Further, when the computer program is executed by a processor, it implements other methods provided by any one of the above embodiments of the present disclosure.

[0118] The engine characteristic determination method according to an embodiment of the present disclosure, based on the state of the whole vehicle, obtains engine external characteristic parameters through devices such as a cylinder pressure sensor and a combustion analyzer, and combines a chassis dynamometer test; obtains the transmission efficiency of the transmission system based on the engine output power and the chassis dynamometer wheel-end test power, overcomes the influence of environmental parameters on the results, and the obtained results are more accurate, providing an effective reference boundary for the power matching of the engine.

[0119] Embodiment 4

[0120] The fourth aspect of the embodiments of the present disclosure provides an electronic device, such as Figure 7 shown, the electronic device at least includes a processor 401 and a memory 402. A computer program is stored on the memory 402. When the processor 401 executes the computer program on the memory 402, the method provided by any embodiment of the present disclosure is implemented. Exemplarily, the method executed by the computer program of the electronic device is as follows:

[0121] S21, determining an indicated torque of the engine based on a gear position and an engine speed;

[0122] S22, determining an engine loss torque based on the engine speed;

[0123] S23, determining an engine characteristic of the engine based on the indicated torque and the engine loss torque, where the engine characteristic at least includes an external characteristic torque of the engine and / or a transmission efficiency of a transmission system.

[0124] Specifically, when implemented, the above-mentioned indicated torque determination module 210, torque loss determination module 220, engine characteristic determination module 230, etc. are all stored in the memory 402 as program units, and the processor 401 executes the above-mentioned program units stored in the memory 402 to implement corresponding functions.

[0125] According to the method for determining an engine characteristic of the embodiments of the present disclosure, based on the state of the whole vehicle, through devices such as a cylinder pressure sensor and a combustion analyzer, and in combination with a chassis dynamometer test, engine external characteristic parameters are obtained; based on the engine output power and the chassis dynamometer wheel side test power, the transmission efficiency of the transmission system is obtained, overcoming the influence of environmental parameters on the results, and the obtained results are more accurate, providing an effective reference boundary for the power matching of the engine.

[0126] The above storage medium may be included in the above electronic device; or it may exist alone without being assembled into the electronic device.

[0127] The above storage medium carries one or more programs. When the above one or more programs are executed by the electronic device, the electronic device is enabled to: obtain at least two Internet protocol addresses; send a node evaluation request including at least two Internet protocol addresses to a node evaluation device, where the node evaluation device selects an Internet protocol address from the at least two Internet protocol addresses and returns it; receive the Internet protocol address returned by the node evaluation device; where the obtained Internet protocol address indicates an edge node in a content delivery network.

[0128] Alternatively, the above storage medium carries one or more programs which, when executed by the electronic device, cause the electronic device to: receive a node evaluation request including at least two Internet Protocol addresses; select an Internet Protocol address from the at least two Internet Protocol addresses; return the selected Internet Protocol address; wherein the received Internet Protocol address indicates an edge node in a content delivery network.

[0129] Computer program code for carrying out operations of the present disclosure may be written in one or more programming languages or combinations thereof, including but not limited to object-oriented programming languages such as Java, Smalltalk, C++, and also including conventional procedural programming languages such as the "C" language or similar programming languages. The program code may execute entirely on the passenger computer, partly on the passenger computer, as a stand-alone software package, partly on the passenger computer and partly on a remote computer, or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the passenger computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., through the Internet using an Internet service provider).

[0130] It should be noted that the above-mentioned storage medium in the present disclosure can be a computer-readable signal medium, a computer-readable storage medium, or any combination of the two. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples of the computer-readable storage medium can include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium can be any tangible medium that contains or stores a program, and this program can be used by or in conjunction with an instruction execution system, apparatus, or device. In the present disclosure, a computer-readable signal medium can include a data signal propagated in a baseband or as part of a carrier wave, in which computer-readable program code is carried. Such a propagated data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A computer-readable signal medium can also be any storage medium other than a computer-readable storage medium, and this computer-readable signal medium can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the storage medium can be transmitted by any appropriate medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0131] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than marked in the accompanying drawings. For example, two consecutive blocks shown may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or operations, or can be implemented by a combination of dedicated hardware and computer instructions.

[0132] The units involved in the embodiments of the present disclosure can be implemented in software or in hardware. In some cases, the name of a unit does not constitute a limitation on the unit itself.

[0133] The functions described above herein can be performed, at least in part, by one or more hardware logic components. By way of example, and without limitation, the types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system on a chip (SOCs), complex programmable logic devices (CPLDs), and the like.

[0134] In the context of the present disclosure, a machine-readable medium may be a tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0135] The above description is only of the preferred embodiments of the present disclosure and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the disclosure involved in the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosure concept. For example, a technical solution formed by mutually replacing the above features with technical features having similar functions (but not limited to) disclosed in the present disclosure.

[0136] In addition, although the operations are depicted in a particular order, this should not be construed as requiring that the operations be performed in the particular order shown or in sequential order. In certain environments, multitasking and parallel processing may be advantageous. Likewise, although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present disclosure. Certain features described in the context of separate embodiments may also be implemented combinatorially in a single embodiment. Conversely, the various features described in the context of a single embodiment may also be implemented separately or in any suitable sub-combination in multiple embodiments.

[0137] Although the subject matter has been described in language specific to structural features and / or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. On the contrary, the specific features and acts described above are merely example forms for implementing the claims.

[0138] The above has described in detail multiple embodiments of the present disclosure, but the present disclosure is not limited to these specific embodiments. Based on the concept of the present disclosure, those skilled in the art can make various variations and modifications to the embodiments, and these variations and modifications should all fall within the scope protected by the present disclosure.

Claims

1. A method for determining engine characteristics, characterized in that, including: determining an indicated torque of the engine based on a gear position and an engine speed; determining an engine loss torque based on the engine speed; determining an engine characteristic of the engine based on the indicated torque and the engine loss torque, the engine characteristic at least including an external characteristic torque of the engine and / or a transmission efficiency of a transmission system; wherein, the determining an engine loss torque based on the engine speed includes: determining a first drag torque at different engine speeds based on a neutral coast-down test; determining a second drag torque at different engine speeds based on a in-gear test; determining the engine loss torque at different engine speeds based on the first drag torque, the second drag torque, and a transmission ratio of the transmission system; wherein, the determining the engine loss torque at different engine speeds based on the first drag torque, the second drag torque, and the transmission ratio of the transmission system includes: determining a wheel-end loss torque based on the first drag torque and the second drag torque; determining the engine loss torque based on the wheel-end loss torque and the transmission ratio.

2. The determination method according to claim 1, characterized in that The determining an indicated torque of the engine based on a gear position and an engine speed includes: determining an indicated torque of the engine and a wide-open throttle indicated torque at different gear positions and different engine speeds.

3. The determination method according to claim 2, characterized in that, The determining an indicated torque of the engine at different gear positions and different engine speeds includes determining a first indicated torque at a fixed gear position and a fixed engine speed; and / or determining a second indicated torque at a fixed gear position and different engine speeds; and / or determining a third indicated torque at different gear positions and different engine speeds.

4. The determination method according to claim 1, wherein The determining a first drag torque at different engine speeds based on a neutral coast-down test includes: acquiring a neutral coast-down force during a vehicle neutral coasting; determining the first drag torque based on the neutral coast-down force and a tire rolling radius of the vehicle.

5. The determination method according to claim 1, characterized in that The determining a second drag torque at different engine speeds based on a in-gear test includes: acquiring an in-gear coast-down force during a vehicle in-gear coasting; determining the second drag torque based on the in-gear coast-down force and the tire rolling radius of the vehicle.

6. The determination method according to claim 2, wherein Determining an external characteristic torque of the engine based on the indicated torque and the loss torque includes: determining an external characteristic torque of the engine at different speeds based on the wide-open throttle indicated torque and the engine loss torque.

7. The determination method according to claim 1, wherein Determining a transmission efficiency of a transmission system based on the indicated torque and the loss torque includes: determining an output net torque based on the indicated torque and the loss torque, based on a gear position and an engine speed; determining a wheel-end power of a vehicle based on a wheel hub test; determining the transmission efficiency based on the output net torque, the engine speed, and the wheel-end power.

8. An apparatus for determining engine characteristics, characterized in that, including: an indicated torque determining module configured to determine an indicated torque of the engine based on a gear position and an engine speed; a torque loss determining module configured to determine an engine loss torque based on the engine speed; An engine characteristic determination module, configured to determine the engine characteristics of the engine based on the indicated torque and the engine loss torque, where the engine characteristics at least include the external characteristic torque of the engine and / or the transmission efficiency of the transmission system; The torque loss determination module includes: A first drag torque determination unit, configured to determine the first drag torque at different engine speeds based on a neutral coast-down test; A second drag torque determination unit, configured to determine the second drag torque at different engine speeds based on a in-gear test; An engine loss torque determination unit, configured to determine the engine loss torque at different engine speeds based on the first drag torque, the second drag torque, and the transmission ratio of the transmission system; The determining the engine loss torque at different engine speeds based on the first drag torque, the second drag torque, and the transmission ratio of the transmission system includes: Determining a wheel-end loss torque based on the first drag torque and the second drag torque; Determining the engine loss torque based on the wheel-end loss torque and the transmission ratio.

9. A computer-readable storage medium storing a computer program for executing the method for determining the engine characteristics according to any one of claims 1-7 above.

10. An electronic device, the electronic device comprising: A processor; A memory for storing instructions executable by the processor; The processor is configured to execute the method for determining the engine characteristics according to any one of claims 1-7 above.

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