Control method and device of vehicle, vehicle and storage medium

Abstract

The application discloses a control method and device of a vehicle, the vehicle and a storage medium. The method comprises the following steps: obtaining engine torques of an engine in a vehicle at multiple stable vehicle speeds, and obtaining multiple engine torques; determining a target demand torque of a clutch in the vehicle based on the multiple engine torques; determining a target pressure corresponding to the clutch under the target demand torque; and controlling rotation of an electronic oil pump in the vehicle based on the target pressure. The application solves the technical problem that the control demand of dynamic pressure cannot be met.

Description

Technical Field

[0001] The present invention relates to the field of vehicles, and in particular to a vehicle control method, a vehicle control device, a vehicle, and a storage medium. Background Art

[0002] Currently, clutches are used in a variety of automotive transmission applications, with hydraulically controlled clutches being the most widely used. These clutches use an oil pump or solenoid valve to adjust the pressure between the clutch friction plates, ensuring torque transmission.

[0003] The hydraulically controlled clutch has poorer accuracy and response performance in controlling the pressure through the oil pump than in controlling the pressure through the solenoid valve, resulting in poor tracking of the pressure and input torque. Therefore, the above problem has a technical problem of being unable to meet the control requirements of dynamic pressure.

[0004] With regard to the problem that the above-mentioned existing technologies cannot meet the control requirements of dynamic pressure, no effective solution has been proposed so far. Summary of the Invention

[0005] Embodiments of the present invention provide a vehicle control method, device, vehicle, and storage medium to at least solve the technical problem of being unable to meet the control requirements of dynamic pressure.

[0006] According to one aspect of an embodiment of the present invention, a vehicle control method is provided, which may include: obtaining the engine torque of the engine in the vehicle at multiple stable vehicle speeds to obtain multiple engine torques; determining the target required torque of the clutch in the vehicle based on the multiple engine torques; determining the target pressure corresponding to the clutch at the target required torque; and controlling the rotation of the electronic oil pump in the vehicle based on the target pressure.

[0007] Optionally, based on multiple engine torques, the target required torque of the clutch in the vehicle is determined, including: determining the maximum engine torque among the multiple engine torques as the first target required torque of the clutch; and determining the sum of the first target required torque and a predetermined offset as the second target required torque of the clutch.

[0008] Optionally, the method further includes determining a first pressure of the clutch based on the first target required torque, and determining a second pressure of the clutch based on the second target required torque.

[0009] Optionally, based on the first target required torque, the first pressure of the clutch is determined, and based on the second target required torque, the second pressure of the clutch is determined, including: determining the quotient of the first target required torque and the friction coefficient of the clutch and the sum of the two at the half-engagement point of the clutch as the first pressure, and determining the quotient of the second target required torque and the friction coefficient and the sum of the two at the half-engagement point as the second pressure.

[0010] Optionally, determining the target pressure of the clutch corresponding to the target required torque includes: determining the required torque of the clutch during operation; and determining the target pressure based on the required torque and the target required torque.

[0011] Optionally, the target pressure is determined based on the demand torque and the target demand torque, including: determining the target pressure to be a first pressure in response to the demand torque being less than a first target demand torque; or determining the target pressure to be a second pressure in response to the demand torque being greater than a second target demand torque.

[0012] Optionally, based on the target pressure, the rotation of the electronic oil pump in the vehicle is controlled, including: determining the pressure of the clutch during operation; in response to the target pressure being greater than the pressure during operation, controlling the electronic oil pump to accelerate rotation; or in response to the target pressure being not greater than the pressure during operation, controlling the electronic oil pump to decelerate rotation.

[0013] According to another aspect of an embodiment of the present invention, a vehicle control device is also provided, which may include: an acquisition unit, used to acquire the engine torque of the engine in the vehicle at multiple stable vehicle speeds, and obtain multiple engine torques; a first determination unit, used to determine the target required torque of the clutch in the vehicle based on the multiple engine torques; a second determination unit, used to determine the target pressure corresponding to the clutch under the target required torque; and a control unit, used to control the rotation of the electronic oil pump in the vehicle based on the target pressure.

[0014] According to another aspect of an embodiment of the present invention, a vehicle is provided, which is used to execute the vehicle control method according to an embodiment of the present invention.

[0015] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device containing the computer-readable storage medium is controlled to execute the vehicle control method according to an embodiment of the present invention.

[0016] In an embodiment of the present invention, the engine torque of the engine in the vehicle at multiple stable vehicle speeds is obtained to obtain multiple engine torques; based on the multiple engine torques, the target required torque of the clutch in the vehicle is determined; the target pressure corresponding to the clutch under the target required torque is determined; and based on the target pressure, the rotation of the electronic oil pump in the vehicle is controlled. In other words, the present invention determines the target required torque of the clutch in the vehicle from the multiple engine torques, and based on the determined target required torque of the clutch, the target pressure corresponding to the target required torque of the clutch can be determined, and further based on the determined target pressure, the rotation of the electronic oil pump in the vehicle is controlled, thereby achieving the technical effect of meeting the control requirements of dynamic pressure and solving the technical problem of being unable to meet the control requirements of dynamic pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 is a flow chart of a vehicle control method according to an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of a novel hydraulically controlled clutch structure according to an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the operation of a clutch target pressure calculation method according to an embodiment of the present invention;

[0021] Figure 4 is a flowchart of a clutch target pressure calculation method software according to an embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of a vehicle control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0025] Example 1

[0026] According to an embodiment of the present invention, an embodiment of a vehicle control method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0027] Figure 1 is a flow chart of a vehicle control method according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0028] Step S102 , obtaining the engine torque of the engine in the vehicle at multiple stable vehicle speeds to obtain multiple engine torques.

[0029] In the technical solution provided in step S102 of the present invention, the engine torque of the vehicle's engine at multiple stable speeds can be obtained, resulting in multiple engine torques. The engine torque can be a specific indicator of the engine's acceleration capability, representing the work done by the reciprocating motion of the piston in the cylinder. The unit of engine torque is Newton-meter (N·M). The stable speed can be a stable speed point, which can be used to represent the speed of the vehicle at a certain point during stable driving.

[0030] Alternatively, the engine torque of the vehicle's engine under direct-drive conditions at multiple stable vehicle speeds can be obtained, resulting in multiple engine torques. The direct-drive condition can be defined as a condition where the engine directly drives the vehicle through the transmission when the vehicle speed is within the engine's high-efficiency range. It should be noted that this is merely an example and does not limit the specific vehicle operating conditions.

[0031] For example, the engine torque at each stable speed point in the vehicle speed range of 0 to 140 kilometers per hour (kph) under direct drive conditions can be collected, and multiple engine torques at multiple stable speeds can be obtained.

[0032] Step S104 : determining a target required torque of a clutch in the vehicle based on the plurality of engine torques.

[0033] In the technical solution provided in step S104 of the present invention, a target torque requirement of the vehicle clutch can be determined based on the obtained multiple engine torques. The target torque requirement can be a target torque value required by the engine clutch end, which can be represented by T1 or T2 and is expressed in N·M.

[0034] Alternatively, based on the obtained multiple engine torques, the target demand torque of the clutch may be determined from the obtained multiple engine torques.

[0035] For example, the engine torques at stable vehicle speeds of 100 kph, 120 kph, and 140 kph can be collected. Based on the three obtained engine torques, the maximum engine torque can be determined as the target required torque of the clutch. It should be noted that the determination of the target required torque here is merely an example and does not impose any specific limitation on the method for determining the target required torque.

[0036] Step S106 , determining the target pressure of the clutch corresponding to the target required torque.

[0037] In the technical solution of step S106 of the present invention, a target pressure corresponding to the clutch under the target required torque can be determined. The target pressure can be the pressure between the clutch friction plates, which can be represented by P1 or P2 and the unit is bar (abbreviated as bar).

[0038] Optionally, based on the determined target required torque of the clutch, a target pressure of the clutch corresponding to the target required torque may be calculated.

[0039] For example, the pressure corresponding to the target required torque can be preset as the target pressure. The target required torque of the clutch can be obtained, and based on the obtained target required torque, the target pressure corresponding to the clutch can be calculated using the target required torque and other parameters.

[0040] Step S108: Controlling the rotation of the electronic oil pump in the vehicle based on the target pressure.

[0041] In the technical solution of step S108 of the present invention, the rotation of the electronic oil pump in the vehicle can be controlled based on the determined target pressure. The electronic oil pump can be an electrically driven oil pump that can be used to compress or transport liquid to other locations. Controlling the rotation of the electronic oil pump in the vehicle can include increasing or decreasing the rotation speed of the electronic oil pump.

[0042] Optionally, based on the determined target pressure, the rotation speed of the electronic oil pump in the vehicle may be controlled to achieve the purpose of controlling the rotation of the electronic oil pump.

[0043] In the above steps S102 to S108 of the present invention, the engine torque of the engine in the vehicle at multiple stable vehicle speeds is obtained to obtain multiple engine torques; based on the multiple engine torques, the target required torque of the clutch in the vehicle is determined; the target pressure corresponding to the clutch under the target required torque is determined; and based on the target pressure, the rotation of the electronic oil pump in the vehicle is controlled. In other words, the present invention determines the target required torque of the clutch in the vehicle from the multiple engine torques, and based on the determined target required torque of the clutch, the target pressure corresponding to the target required torque of the clutch can be determined, and further based on the determined target pressure, the rotation of the electronic oil pump in the vehicle is controlled, thereby achieving the technical effect of meeting the control requirements of dynamic pressure and solving the technical problem of being unable to meet the control requirements of dynamic pressure.

[0044] The above method of this embodiment is further introduced below.

[0045] As an optional embodiment, step S104 determines the target required torque of the clutch in the vehicle based on multiple engine torques, including: determining the maximum engine torque among the multiple engine torques as the first target required torque of the clutch; and determining the sum of the first target required torque and a predetermined offset as the second target required torque of the clutch.

[0046] In this embodiment, multiple engine torques are obtained at multiple stable vehicle speeds. The maximum engine torque among the obtained multiple engine torques is then determined as the first target torque demanded by the clutch. The sum of the first target torque demanded and a preset offset is then determined, and the sum of the first target torque demanded and the preset offset is then determined as the second target torque demanded by the clutch. The first target torque demanded can be the maximum engine torque, represented by T1 in N·M. The second target torque demanded can be the maximum engine torque plus a preset offset, represented by T2 in N·M. The offset can be a preset value, such as 1 or 2. This is for illustrative purposes only and does not impose any specific limitation on the offset value.

[0047] Optionally, based on the multiple engine torques obtained, the maximum engine torque obtained is determined as a first target required torque of the clutch. The first target required torque can cover the power transmission of the engine under normal operating conditions. Based on the determined first target required torque, a predetermined offset is added to the first target required torque to determine a second target required torque of the clutch, thereby ensuring that the required torque does not frequently fluctuate between the determined first and second target required torques.

[0048] For example, the engine torques at stable vehicle speed points of 100 kph, 120 kph, and 140 kph are obtained, respectively. The maximum engine torque can be determined as the first target required torque T1 of the clutch from the three obtained engine torques. The predetermined offset value 2 is added to the determined first target required torque to obtain the second target required torque T2 of the clutch.

[0049] As an optional embodiment, the method further includes: determining a first pressure of the clutch based on the first target required torque, and determining a second pressure of the clutch based on the second target required torque.

[0050] In this embodiment, a first clutch pressure can be determined based on the determined first target required torque, and a second clutch pressure can be determined based on the determined second target required torque. The first pressure can be the pressure corresponding to the first target required torque, denoted by P1 in bar. The second pressure can be the pressure corresponding to the second target required torque, denoted by P2 in bar.

[0051] For example, the maximum engine torque at stable vehicle speeds of 100 kph, 120 kph, and 140 kph is obtained as the first target clutch torque T1. The corresponding first pressure P1 is calculated using parameters such as the first target torque T1 and the friction coefficient. A pre-set offset value of 2 is added to the first target torque T1 to determine the second target clutch torque T2. The corresponding second pressure P2 is calculated using parameters such as the second target torque T2 and the friction coefficient.

[0052] As an optional embodiment, the first pressure of the clutch is determined based on the first target required torque, and the second pressure of the clutch is determined based on the second target required torque, including: determining the quotient of the first target required torque and the friction coefficient of the clutch and the sum of the half-engagement point of the clutch as the first pressure, and determining the quotient of the second target required torque and the friction coefficient and the sum of the half-engagement point as the second pressure.

[0053] In this embodiment, based on the determined first target demand torque, the first pressure can be determined by summing the quotient of the first target demand torque and the clutch friction coefficient, and the clutch half-engagement point. Based on the determined second target demand torque, the second pressure can be determined by summing the quotient of the second target demand torque and the clutch friction coefficient, and the clutch half-engagement point. The clutch friction coefficient can be the ratio of the friction force between the clutch friction plates to the normal force acting on the friction plates, and can be represented by Gain. The clutch half-engagement point can be the critical pressure point at which the clutch can just transmit torque, and can be represented by Pk.

[0054] Optionally, based on the determined first target required torque, the sum of the quotient of the determined first target required torque and the friction coefficient of the clutch and the half-engagement point of the clutch can be determined as the first pressure. The first pressure corresponding to the first target required torque can be calculated using the following formula:

[0055] P1=T1 / Gain+Pk

[0056] Wherein, T1 is the determined first target required torque, Gain is the friction coefficient of the clutch, Pk is the half-engagement point of the clutch, and P1 is the calculated first pressure corresponding to the first target required torque.

[0057] Optionally, based on the determined second target required torque, the sum of the quotient of the determined second target required torque and the friction coefficient of the clutch and the half-engagement point of the clutch can be determined as the second pressure. The second pressure corresponding to the second target required torque can be calculated using the following formula:

[0058] P2=T2 / Gain+Pk

[0059] Wherein, T2 is the determined second target required torque, and P2 is the calculated second pressure corresponding to the second target required torque.

[0060] As an optional embodiment, step S106, determining the target pressure of the clutch corresponding to the target required torque, includes: determining the required torque of the clutch during operation; and determining the target pressure based on the required torque and the target required torque.

[0061] In this embodiment, the clutch torque required during operation can be determined, and the target pressure can be determined based on the determined required torque and the determined first target required torque and second target required torque. The required torque can be a required torque value at the engine clutch end.

[0062] In this embodiment, by determining the required torque and the target required torque, the target pressure is further determined, so as to achieve the purpose of stable target pressure control. For different required torque intervals, a fixed target pressure is executed, thereby reducing the number of times the target pressure changes and improving the stability of the target pressure, thereby achieving the technical effect of meeting the control requirements of dynamic pressure and solving the technical problem of not being able to meet the control requirements of dynamic pressure.

[0063] As an optional embodiment, step S106 determines the target pressure based on the demand torque and the target demand torque, including: in response to the demand torque being less than the first target demand torque, determining the target pressure to be the first pressure; or in response to the demand torque being greater than the second target demand torque, determining the target pressure to be the second pressure.

[0064] In this embodiment, based on the determined required torque and the determined first target required torque and second target required torque, in response to the required torque being less than the first target required torque, the target pressure can be determined to be the first pressure; in response to the required torque being greater than the second target required torque, the target pressure can be determined to be the second pressure.

[0065] Optionally, when the required torque gradually increases over a period of time and is less than the first target required torque, the target pressure can be determined as the first pressure; when the required torque gradually increases to be greater than the second target required torque, the target pressure can be determined as the second pressure; when the required torque gradually decreases over a period of time and is greater than the second target required torque, the target pressure can be determined as the second pressure; when the required torque gradually decreases to be less than the first target required torque, the target pressure can be determined as the first pressure.

[0066] For example, when the required torque gradually increases during the period 0 to t1 and is less than the first target required torque T1, the target pressure can be determined to be the first pressure P1; as the required torque gradually increases during the period t1 to t2, when the required torque is greater than the first target required torque T1 and less than the second target required torque T2, the target pressure can be determined to maintain the target pressure during the previous period 0 to t1, which is still the first pressure P1; as the required torque gradually increases during the period t2 to t3, when the required torque is greater than the second target required torque T2, the target pressure can be determined to be the first pressure P1. The target pressure is the second pressure P2; when the required torque gradually decreases during the period t3 to t4 and is greater than the second target required torque T2, the target pressure can be determined to be the second pressure P2; as the required torque gradually decreases during the period t4 to t5 and is less than the second target required torque T2, the target pressure can be determined to maintain the target pressure during the previous period t3 to t4, which is still the second pressure P2; as the required torque gradually decreases during the period t5 to t6 and is less than the first target required torque P1, the target pressure can be determined to be the first pressure P1.

[0067] For example, when the demand torque gradually increases in the period 0-t1 and is greater than the second target demand torque T2, the target pressure can be determined as the second pressure P2; when the demand torque gradually decreases in the period t1-t2 and is less than the second target demand torque T2, the target pressure can be determined as the target pressure in the previous period 0-t1, which is still the second pressure P2; when the demand torque gradually decreases in the period t2-t3 and is less than the first target demand torque P1, the target pressure can be determined as the first pressure P1.

[0068] As an optional embodiment, based on the target pressure, the electronic oil pump in the vehicle is controlled to rotate, including: determining the pressure of the clutch during operation; in response to the target pressure being greater than the pressure during operation, controlling the electronic oil pump to accelerate rotation; or in response to the target pressure not being greater than the pressure during operation, controlling the electronic oil pump to decelerate rotation.

[0069] In this embodiment, based on the determined target pressure and the determined pressure of the clutch during operation, in response to the determined target pressure being greater than the determined pressure of the clutch during operation, the electronic oil pump is controlled to accelerate rotation; in response to the determined target pressure not being greater than the determined pressure of the clutch during operation, the electronic oil pump is controlled to decelerate rotation.

[0070] In this embodiment, the engine torque of the engine in the vehicle at a plurality of stable vehicle speeds is obtained to obtain a plurality of engine torques; based on the plurality of engine torques, the target demand torque of the clutch in the vehicle is determined; the target pressure corresponding to the target demand torque of the clutch is determined; and based on the target pressure, the electronic oil pump in the vehicle is controlled to rotate. That is, from the plurality of engine torques, the target demand torque of the clutch in the vehicle is determined, based on the determined target demand torque of the clutch, the target pressure corresponding to the target demand torque of the clutch can be determined, and further based on the determined target pressure, the rotation of the electronic oil pump in the vehicle is controlled, thereby achieving the technical effect of meeting the control demand of dynamic pressure and solving the technical problem of being unable to meet the control demand of dynamic pressure.

[0071] Embodiment 2

[0072] The technical solutions of the embodiments of the present application will be illustrated below in conjunction with preferred embodiments.

[0073] With the rapid development of the automobile industry, clutches are applied in various ways in automobile transmissions, among which, hydraulic control clutches have been widely applied. The hydraulic control clutch can adjust the pressure between the clutch friction plates through an oil pump or an electromagnetic valve, thereby ensuring the torque transmission of the clutch. However, the hydraulic control clutch has relatively poor precision and response performance in controlling pressure through an oil pump compared with an electromagnetic valve, thereby leading to poor followability of pressure to input torque.

[0074] To solve the above problems, a hybrid transmission clutch pressure control method is proposed. This method directly controls the clutch pressure through an oil pump, achieving the purpose of controlling the target pressure and the actual pressure. However, this method mainly realizes the control between the target pressure and the actual pressure, and therefore there is a problem that the control between the torque and the target pressure cannot be achieved.

[0075] Related technologies also propose a DCT main oil pressure system based on dual electronic oil pumps. This method uses the oil pumps to control the main oil pressure of the entire DCT system. However, this method does not directly control the clutch pressure through the oil pumps, and the research does not focus on the control method between target pressure and actual pressure, or between torque and target pressure. A method and device for controlling clutch pressure based on electric pump speed has also been proposed. This method directly controls the clutch pressure through the oil pump, achieving the purpose of controlling the target pressure and actual pressure. However, this method primarily controls the target pressure and actual pressure, and therefore suffers from the problem of not being able to control the torque and target pressure.

[0076] To address the aforementioned technical issues, embodiments of the present invention provide a vehicle control method that can simultaneously meet clutch torque requirements and stably achieve target pressure control. During actual vehicle use, this method implements breakpoint control of clutch pressure, maintaining a fixed pressure for different torque requirements. This reduces pressure fluctuations and improves pressure stability, ultimately achieving improved clutch torque transmission performance through pressure stability.

[0077] Figure 2 Schematic diagram of a novel hydraulically controlled clutch structure according to an embodiment of the present invention. Figure 2 As shown, the structure of this novel hydraulically controlled clutch includes: a pressure relief valve 201, a clutch oil circuit 202, an electronic oil pump 203, an oil reservoir 204, an oil filter 205, and a pressure sensor 206. When the clutch requires pressure, the electronic oil pump 203 rotates forward, drawing hydraulic oil from the oil reservoir 204. The oil then passes through the oil filter 205 and the electronic oil pump 203 and reaches the clutch oil circuit 202. When the pressure sensor 206 indicates that the target pressure is greater than the clutch pressure during operation, the electronic oil pump 203 is controlled to accelerate. When the pressure sensor 206 indicates that the target pressure is less than the clutch pressure during operation, the electronic oil pump 203 is controlled to decelerate.

[0078] Figure 3 FIG. 1 is a schematic diagram of a clutch target pressure calculation method according to an embodiment of the present invention. Figure 3As shown, the engine torque at each stable vehicle speed in the range of 0 to 140 kph in the direct drive mode can be collected, and a plurality of engine torques at a plurality of stable vehicle speeds can be obtained. Based on the obtained plurality of engine torques, the maximum engine torque can be determined as the first target demand torque T1 of the clutch from the obtained plurality of engine torques. The first target demand torque T1 can be the highest value of the engine transmission torque of the engine in the normal mode, which can cover the power transmission of the engine in the normal mode. Further, the sum of the determined first target demand torque T1 and the pre-set offset is determined as the second target demand torque T2 of the clutch.

[0079] Alternatively, based on the determined first target demand torque T1 and the second target demand torque T2, the first pressure P1 corresponding to the first target demand torque T1 and the second pressure P2 corresponding to the second target demand torque T2 can be calculated by the following formula:

[0080] P1 = T1 / Gain + Pk

[0081] P2 = T2 / Gain + Pk

[0082] wherein T1 and T2 are the determined first target demand torque and the second target demand torque, respectively, Gain is the friction coefficient of the clutch, Pk is the half- engagement point of the clutch, and P1 and P2 are the calculated first pressure corresponding to the first target demand torque T1 and the second pressure corresponding to the second target demand torque T2, respectively.

[0083] In this embodiment, the system initial torque can be set to 0. When the demand torque gradually increases in a period of time and is less than the first target demand torque T1, the target pressure can be determined as the first pressure P1. As the demand torque gradually increases, when the demand torque is greater than the first target demand torque T1 and less than the second target demand torque T2, the target pressure can still be determined as the first pressure P1. As the demand torque gradually increases, when the demand torque is greater than the second target demand torque T2, the target pressure can be determined as the second pressure P2. When the demand torque gradually decreases in a period of time and is greater than the second target demand torque T2, the target pressure can still be determined as the second pressure P2. As the demand torque gradually decreases, when the demand torque is less than the second target demand torque T2, the target pressure can still be determined as the second pressure P2. As the demand torque gradually decreases, when the demand torque is less than the first target demand torque T1, the target pressure can be determined as the first pressure P1.

[0084] Figure 4 is a flow chart of a clutch target pressure calculation method according to an embodiment of the present application, as shown in Figure 4 the clutch target pressure calculation method can comprise the following steps:

[0085] Step S401: Determine whether the target pressure is equal to the first pressure.

[0086] In the above step S401 , the target pressure is initially set to be equal to the first pressure P1 .

[0087] Step S402 : The required torque is greater than the second target required torque T2 .

[0088] In the above step S402 , when the required torque is greater than the second target required torque T2 , the process proceeds to step S404 ; when the required torque is not greater than the second target required torque T2 , the process proceeds to step S403 .

[0089] Step S403 : The required torque is less than the first target required torque T1 .

[0090] In the above step S403 , when the required torque is less than the second target required torque T1 , the process proceeds to step S405 ; when the required torque is not less than the first target required torque T1 , the process proceeds to step S406 .

[0091] Step S404: Determine whether the target pressure is equal to the second pressure P2.

[0092] In the above step S404 , when the required torque is greater than the second target required torque T2 , the target pressure is determined to be equal to the second pressure P2 .

[0093] Step S405 , determining whether the target pressure is equal to the first pressure P1 .

[0094] In the above step S405 , when the required torque is less than the first target required torque T1 , the target pressure is determined to be equal to the first pressure P1 .

[0095] Step S406: determining the target pressure to maintain the target pressure of the previous cycle.

[0096] In the above step S406 , when the required torque is not greater than the second target required torque T2 and the required torque is not less than the first target required torque T1 , the target pressure is determined to maintain the target pressure of the previous cycle.

[0097] For example, when the required torque gradually increases over a period of time and is less than the first target required torque T1, the target pressure can be determined to be the first pressure P1; as the required torque gradually increases, when the required torque is greater than the first target required torque T1 and less than the second target required torque T2, the target pressure can be determined to maintain the target pressure of the previous cycle, which is still the first pressure P1; as the required torque gradually increases, when the required torque is greater than the second target required torque T2, the target pressure can be determined to be the second pressure P2; when the required torque gradually decreases over a period of time and is greater than the second target required torque T2, the target pressure can be determined to be the second pressure P2; as the required torque gradually decreases, when the required torque is less than the second target required torque T2, the target pressure can be determined to maintain the target pressure of the previous cycle, which is still the second pressure P2.

[0098] Step S407: output the target pressure.

[0099] In the above step S407 , the determined target pressure is output.

[0100] In this embodiment, when the clutch operates at a lower required torque, the oil pump motor can operate at a lower power, resulting in lower system losses, thereby improving system efficiency and extending driving range. When the clutch operates at a higher required torque, the oil pump motor can operate at a higher power, resulting in a higher system operating pressure, thereby ensuring vehicle power performance. Therefore, this embodiment allows the clutch to transmit torque across the entire torque range while avoiding frequent switching of the clutch operating pressure, thereby achieving stable pressure control.

[0101] In an embodiment of the present invention, multiple engine torques are obtained by acquiring the engine torques of the engine in the vehicle at multiple stable vehicle speeds; based on the multiple engine torques, the target required torque of the clutch in the vehicle is determined; the target pressure corresponding to the clutch under the target required torque is determined; and based on the target pressure, the rotation of the electronic oil pump in the vehicle is controlled. In other words, the present invention determines the target required torque of the clutch in the vehicle from the multiple engine torques, and based on the determined target required torque of the clutch, the target pressure corresponding to the target required torque of the clutch can be determined, and further based on the determined target pressure, the rotation of the electronic oil pump in the vehicle is controlled, thereby achieving the technical effect of meeting the control requirements of dynamic pressure and solving the technical problem of being unable to meet the control requirements of dynamic pressure.

[0102] Example 3

[0103] According to an embodiment of the present invention, a vehicle control device is further provided. It should be noted that the vehicle control device can be used to execute the vehicle control method in Example 1.

[0104] Figure 5 FIG. 1 is a schematic diagram of a vehicle control device according to an embodiment of the present invention. Figure 5 As shown, the vehicle control device 500 may include: an acquisition unit 502 , a first determination unit 504 , a second determination unit 506 and a control unit 508 .

[0105] The acquisition unit 502 is configured to acquire the engine torque of the engine in the vehicle at a plurality of stable vehicle speeds, thereby obtaining a plurality of engine torques.

[0106] The first determining unit 504 is configured to determine a target required torque of a clutch in the vehicle based on a plurality of engine torques.

[0107] The second determining unit 506 is configured to determine a target pressure of the clutch corresponding to the target required torque.

[0108] The control unit 508 is configured to control the rotation of the electronic oil pump in the vehicle based on the target pressure.

[0109] Optionally, the first determination unit 504 includes: a first determination module, used to determine the maximum engine torque among multiple engine torques as the first target required torque of the clutch; a first determination module, used to determine the sum of the first target required torque and a preset offset as the second target required torque of the clutch.

[0110] Optionally, the device further includes: a third determining unit, configured to determine a first pressure of the clutch based on the first target required torque, and to determine a second pressure of the clutch based on the second target required torque.

[0111] Optionally, the third determination unit includes: a determination module for determining the quotient of the first target required torque and the friction coefficient of the clutch, and the sum between the two and the half-engagement point of the clutch as the first pressure, and determining the quotient of the second target required torque and the friction coefficient, and the sum between the two and the half-engagement point as the second pressure.

[0112] Optionally, the second determining unit 506 includes: a first determining module for determining a required torque of the clutch during operation; and a second determining module for determining a target pressure based on the required torque and the target required torque.

[0113] Optionally, the second determination module includes: a first determination submodule, used to determine the target pressure as the first pressure in response to the required torque being not less than the first target required torque and less than the second target required torque; and a second determination submodule, used to determine the target pressure as the second pressure in response to the required torque being not less than the second target required torque.

[0114] Optionally, the control unit 508 includes: a determination module for determining the pressure of the clutch during operation; a first control module for controlling the electronic oil pump to accelerate in response to the target pressure being greater than the pressure during operation; and a second control module for controlling the electronic oil pump to decelerate in response to the target pressure being not greater than the pressure during operation.

[0115] In an embodiment of the present invention, the engine torque of the engine in the vehicle at multiple stable vehicle speeds can be obtained through an acquisition unit to obtain multiple engine torques; the target required torque of the clutch in the vehicle can be determined based on the multiple engine torques through a first determination unit; the target pressure corresponding to the clutch under the target required torque can be determined through a second determination unit; and the rotation of the electronic oil pump in the vehicle can be controlled based on the target pressure through a control unit. In other words, the present invention determines the target required torque of the clutch in the vehicle from multiple engine torques, and based on the determined target required torque of the clutch, the target pressure corresponding to the target required torque of the clutch can be determined, and further based on the determined target pressure, the rotation of the electronic oil pump in the vehicle is controlled, thereby achieving the technical effect of meeting the control requirements of dynamic pressure and solving the technical problem of being unable to meet the control requirements of dynamic pressure.

[0116] Example 4

[0117] According to an embodiment of the present invention, a vehicle is further provided, which is used to execute any one of the vehicle control methods in embodiment 1.

[0118] Example 5

[0119] According to an embodiment of the present invention, a computer-readable storage medium is further provided. The storage medium includes a stored program, wherein the program executes any one of the vehicle control methods in Example 1.

[0120] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0121] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0122] In the several embodiments provided by the present invention, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are merely illustrative. For example, the division of units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, and can be electrical or other forms.

[0123] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected to achieve the purpose of the present embodiment according to actual needs.

[0124] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0125] If the integrated unit is implemented in the form of 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, 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. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store program codes.

[0126] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A vehicle control method, characterized in that: include: Obtaining engine torques of an engine in a vehicle at a plurality of stable vehicle speeds, respectively, to obtain a plurality of engine torques; determining a target required torque of a clutch in the vehicle based on a plurality of the engine torques; determining a target pressure of the clutch corresponding to the target required torque; Based on the target pressure, controlling the rotation of an electronic oil pump in the vehicle; Wherein, determining the target required torque of the clutch in the vehicle based on the multiple engine torques includes: determining the maximum engine torque among the multiple engine torques as the first target required torque of the clutch; determining the sum of the first target required torque and a preset offset as the second target required torque of the clutch; The method also includes: determining the quotient of the first target required torque and the friction coefficient of the clutch and the sum of the two between the half-engagement point of the clutch as the first pressure of the clutch, and determining the quotient of the second target required torque and the friction coefficient and the sum of the two between the half-engagement point as the second pressure of the clutch.

2. The method according to claim 1, characterized in that Determining the target pressure of the clutch corresponding to the target required torque includes: determining a required torque of the clutch during operation; The target pressure is determined based on the demand torque and the target demand torque.

3. The method according to claim 2, characterized in that Determining the target pressure based on the required torque and the target required torque includes: In response to the required torque being less than a first target required torque, determining the target pressure to be the first pressure; or In response to the demand torque being greater than a second target demand torque, the target pressure is determined to be the second pressure.

4. The method according to claim 1, wherein Controlling the rotation of the electronic oil pump in the vehicle based on the target pressure includes: determining a pressure of the clutch during operation; In response to the target pressure being greater than the pressure during operation, controlling the electronic oil pump to rotate faster; or In response to the target pressure being no greater than the pressure during operation, the electronic oil pump is controlled to rotate at a reduced speed.

5. A vehicle control device, characterized in that: include: an acquiring unit, configured to acquire engine torques of an engine in a vehicle at a plurality of stable vehicle speeds, and obtain a plurality of engine torques; a first determining unit, configured to determine a target required torque of a clutch in the vehicle based on a plurality of the engine torques; a second determining unit, configured to determine a target pressure of the clutch corresponding to the target required torque; a control unit, configured to control the rotation of an electronic oil pump in the vehicle based on the target pressure; The first determining unit is configured to determine a target required torque of a clutch in the vehicle based on the plurality of engine torques by: determining a maximum engine torque among the plurality of engine torques as a first target required torque of the clutch; and determining a sum of the first target required torque and a preset offset as a second target required torque of the clutch; The device is also used to: determine the first pressure of the clutch by the quotient of the first target required torque and the friction coefficient of the clutch, and the sum of the two between the half-engagement point of the clutch, and determine the second pressure of the clutch by the quotient of the second target required torque and the friction coefficient, and the sum between the two between the half-engagement point.

6. A vehicle, characterized in that: Used to perform the method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 4.

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