Automatic control method and device for starting idling rotating speed of vehicle

Abstract

The invention discloses a vehicle starting idle speed automatic control method and device.The method comprises the steps that the corresponding first idle speed at the normal working water temperature of a vehicle is obtained, and the first idle speed is set to be an idle speed threshold value; after the vehicle is started, an engine rotating speed signal is obtained, and a second idle rotating speed is obtained according to the engine rotating speed signal; the second idling speed is compared with an idling threshold value, and when the second idling speed is higher than the idling threshold value, it is determined that the engine of the vehicle is in a cold start state; a vehicle starting signal is obtained, and the second idle speed is controlled to be reduced to the idle speed threshold value according to the vehicle starting signal; according to the method, the vehicle is judged to be started in a cold machine mode, a driver directly starts in an idle speed mode after starting, the control instruction is sent out through the engine control unit (ECU) before starting, the idle speed of the engine is reduced, and the output torque of the engine is controlled, so that stable idle speed starting of the vehicle is achieved, and the driving experience and the user satisfaction degree are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle control, and in particular to a method and a device for automatically controlling the idle speed of a vehicle when it starts. Background Art

[0002] After the vehicle is started from a cold engine, in order to quickly reach the optimal operating temperature of the engine, the engine control unit (ECU) will increase the engine idle speed to achieve the purpose of quickly heating up the engine water temperature. Generally, the lower the ambient temperature, the higher the idle speed will be during the warm-up phase. As the engine water temperature slowly increases, the engine idle speed will gradually decrease until it returns to the idle speed under normal working water temperature. Usually, the warm-up phase takes a long time. For automatic transmission models (for manual transmission models, the driver can control the vehicle to start smoothly by controlling the clutch engagement speed), if the driver starts the vehicle directly after the cold engine is started, at this time, because the engine is in the warm-up phase, the idle speed is high and the output torque is large, the vehicle will have a significant forward rush when the brake is released, which significantly reduces the driver's sense of security and comfort. Especially in northern my country, the ambient temperature is low in the cold winter, resulting in a high idle speed when the cold engine is started. If the driver directly operates the vehicle to start at idle after the engine is started, the forward rush of the vehicle will be more prominent, there will be safety risks, leading to user complaints. To address the pain points of using the vehicle under this working condition, if the gear change can be identified during the warm-up phase, the engine idle speed will be automatically reduced before switching to D or R gear to start, thereby avoiding excessive forward rush when the vehicle starts and ensuring a linear and smooth start. This method can greatly enhance the user experience and friendliness. Summary of the invention

[0003] The purpose of the present invention is to provide a method and device for automatically controlling the idle speed of a vehicle when it starts, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a method for automatically controlling the idle speed of a vehicle at start-up, comprising:

[0005] Acquire a first idle speed corresponding to a normal working water temperature of the vehicle, and set the first idle speed as an idle threshold value;

[0006] After the vehicle is started, an engine speed signal is obtained, and a second idle speed is obtained according to the engine speed signal;

[0007] Comparing the second idle speed with the idle threshold value, and determining that the engine of the vehicle is in a cold engine start state when the second idle speed is higher than the idle threshold value;

[0008] A vehicle starting signal is obtained, and the second idle speed is controlled to drop to an idle threshold value according to the vehicle starting signal.

[0009] Furthermore, obtaining the vehicle starting signal also includes:

[0010] Acquire a first pedal signal of a vehicle brake pedal not being pressed and a second pedal signal of a vehicle brake pedal being pressed;

[0011] Acquire a first gear position signal of a parking state and a second gear position signal of a driving state of the vehicle, wherein the first gear position signal includes a P gear signal and an N gear signal, and the second gear position signal includes a D gear signal and an R gear signal;

[0012] generating a vehicle starting signal according to a second pedal signal and a second gear position signal;

[0013] According to the vehicle starting signal and the cold engine starting state, the engine is controlled to reduce the second idle speed to the idle threshold value.

[0014] Further, when the first gear position signal is the P gear and the second pedal signal is obtained, it is determined that the engine is in a cold start state, and the engine speed is controlled to be the second idle speed.

[0015] Further, when the first gear signal is N gear and the second pedal signal is obtained, it is determined that the engine is in a cold start state, and the engine speed is controlled to be a second idle speed.

[0016] Further, when the collected gear signal is the second gear signal, the collected pedal signal is the second pedal signal, and the engine is in a cold start state, the engine speed is controlled to be an idle threshold value.

[0017] Further, when the second pedal signal is not collected and / or it is determined that the engine is not in a cold start state, the engine speed maintains the original operating state.

[0018] On the other hand, a vehicle starting idle speed automatic control device is provided, comprising:

[0019] A setting module, used for obtaining a first idle speed corresponding to a normal working water temperature of the vehicle, and setting the first idle speed as an idle threshold value;

[0020] A first acquisition module is used to acquire an engine speed signal after the vehicle is started, and acquire a second idle speed according to the engine speed signal;

[0021] A comparison module, used for comparing the second idle speed with the idle threshold value, and determining that the engine of the vehicle is in a cold start state when the second idle speed is higher than the idle threshold value;

[0022] The processing module obtains a vehicle starting signal and controls the second idle speed to drop to an idle threshold value according to the vehicle starting signal.

[0023] Furthermore, it also includes:

[0024] A second acquisition module, used for acquiring a first pedal signal when the vehicle brake pedal is not pressed and a second pedal signal when the vehicle brake pedal is pressed;

[0025] A third acquisition module is used to acquire a first gear signal of a parking state of the vehicle and a second gear signal of a driving state, wherein the first gear signal includes a P gear signal and an N gear signal, and the second gear signal includes a D gear signal and an R gear signal;

[0026] The starting signal generating module is used to generate a vehicle starting signal according to the second pedal signal and the second gear signal. The processing module controls the engine to reduce the second idle speed to the idle threshold value according to the vehicle starting signal generated by the starting signal generating module and the cold engine starting state determined by the comparing module.

[0027] In another aspect, an electronic device is provided, the electronic device comprising:

[0028] one or more processors;

[0029] a storage device for storing one or more programs,

[0030] When the one or more programs are executed by the one or more processors, the one or more processors implement a vehicle starting idle speed automatic control method as described in any one of the above.

[0031] On the other hand, a computer-readable storage medium is provided, on which a computer program is stored, characterized in that when the program is executed by a processor, a vehicle starting idle speed automatic control method as described in any one of the above is implemented.

[0032] Compared with the prior art, the beneficial effects of the present invention are: the engine speed, brake pedal signal, and automatic transmission gear position signal are read by the vehicle-mounted sensor, and the engine control unit (ECU) receives the above signals for storage and determination processing. If the determination conditions are met, it is determined that the vehicle is started with a cold engine, and the driver will start the vehicle directly at idle speed after starting. Then, before starting, the engine control unit (ECU) issues a control instruction to reduce the engine idle speed and control the engine output torque, thereby achieving a smooth idle start of the vehicle and improving the driving experience and user satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a flow chart of a method for automatically controlling the idle speed of a vehicle when starting in an embodiment of the present invention;

[0034] Figure 2 This is a connection block diagram of a vehicle starting idle speed automatic control device in an embodiment of the present invention;

[0035] Figure 3A schematic diagram of the connection structure of an electronic device and a computer-readable storage medium in an embodiment of the present invention;

[0036] In the figure: 10, memory; 11, processor; 12, communication bus; 13, communication interface; 14, computer program; 15, storage medium; DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Please refer to the attached drawings of the specification, the present invention provides a technical solution: a method for automatically controlling the idle speed of a vehicle when starting, comprising the following steps:

[0041] S102, obtaining a first idle speed corresponding to a normal working water temperature of the vehicle, and setting the first idle speed as an idle threshold value;

[0042] Among them, the first idle speed corresponding to the normal working water temperature of the vehicle is the idle speed determined by the engine design parameters of the vehicle at the normal working water temperature of the vehicle. Since the engine is in the cold start state, in order to make the engine warm up, the engine idle speed at the cold start should be higher than the first idle speed corresponding to the normal working water temperature of the vehicle. Therefore, the first idle speed is set as the idle threshold value; in this embodiment, the preferred idle threshold value is 150r / min, and the engine speed signal is obtained through the engine speed sensor to determine the current engine idle speed state, and then determine whether the vehicle is a cold start. Compared with the engine idle speed at the normal working water temperature, when the engine idle speed after starting is higher than the normal working water temperature idle speed by more than 150r / min, it is determined to be a cold start, which is the first judgment condition. The idle speed is higher than the normal working water temperature idle speed by more than 150r / min, which is the key point of the judgment condition. The judgment condition higher than the threshold value of 150r / min will be included in the protection scope of the present invention.

[0043] S104, after the vehicle is started, obtaining an engine speed signal, and obtaining a second idle speed according to the engine speed signal;

[0044] S106, comparing the second idle speed with the idle threshold value, and when the second idle speed is higher than the idle threshold value, determining that the engine of the vehicle is in a cold start state;

[0045] Among them, the engine speed signal is obtained through the engine speed sensor to determine the current engine idle speed state. When the vehicle is started with a cold engine, the engine idle speed is compared with the engine idle speed at normal working water temperature. The first judgment condition is that the idle speed after the engine is started is higher than the idle speed at normal working water temperature, that is, the engine is in a cold engine start state.

[0046] S108: Acquire a vehicle starting signal, and control the second idle speed to drop to an idle threshold value according to the vehicle starting signal.

[0047] Specifically, obtaining a vehicle start signal also includes:

[0048] Acquire a first pedal signal of a vehicle brake pedal not being pressed and a second pedal signal of a vehicle brake pedal being pressed;

[0049] Among them, the driver's starting intention is identified by obtaining the vehicle brake pedal signal. Before starting, the driver must first step on the brake pedal to trigger the brake pedal switch and obtain the second pedal signal. Whether the second pedal signal is obtained is the second judgment condition. If the second pedal signal is not received, the control strategy of the engine heat engine is maintained; if the second pedal signal is received, the next step is to identify the gear signal of the automatic transmission switching.

[0050] Acquire a first gear position signal of a parking state and a second gear position signal of a driving state of the vehicle, wherein the first gear position signal includes a P gear signal and an N gear signal, and the second gear position signal includes a D gear signal and an R gear signal;

[0051] generating a vehicle starting signal according to a second pedal signal and a second gear position signal;

[0052] According to the vehicle starting signal and the cold engine starting state, the engine is controlled to reduce the second idle speed to the idle threshold value.

[0053] Among them, the vehicle's automatic transmission gear switching signal is obtained. When the first judgment condition and the second judgment condition are met at the same time, the driver performs a gear shift operation before starting. When the automatic transmission gear signal cuts out the P gear, that is, the gear shift signal is in a non-P state. For quick response, as long as the engine control unit (ECU) recognizes the non-P signal, it is determined that the driver directly enters the starting state after the cold engine is started. The engine control unit (ECU) issues a control command to reduce the engine idle speed, thereby reducing the engine output torque to ensure a smooth start of the vehicle.

[0054] Specifically, when the first gear position signal is the P gear and the second pedal signal is obtained, it is determined that the engine is in a cold start state, and the engine speed is controlled to be the second idle speed.

[0055] Among them, when the first judgment condition and the second judgment condition are met at the same time, but the driver does not perform a gear shifting operation, the automatic transmission gear signal is always in the P gear state, and it is determined that the vehicle does not start after starting, so the engine maintains its original state, that is, the engine is in a hot engine state at the second idle speed and continues to heat up in situ.

[0056] Specifically, when the first gear signal is N gear and the second pedal signal is obtained, it is determined that the engine is in a cold start state, and the engine speed is controlled to be the second idle speed.

[0057] Among them, after the automatic transmission gear signal cuts out of P gear and then cuts into N gear, the engine control unit (ECU) immediately restores the second idle speed to put the engine in a hot engine state.

[0058] Specifically, when the acquired gear signal is the second gear signal, the acquired pedal signal is the second pedal signal, and the engine is in a cold engine start state, the engine speed is controlled to be an idle threshold value.

[0059] Among them, when the automatic transmission shifter switches to D gear or R gear again, the engine control unit (ECU) issues a control command to reduce the engine idle speed to the idle speed of normal working water temperature to ensure smooth idle start of the vehicle.

[0060] Specifically, when the second pedal signal is not collected and / or it is determined that the engine is not in a cold start state, the engine speed maintains the original operating state.

[0061] If any one of the first determination condition and the second determination condition is not satisfied, the engine maintains the original operating state.

[0062] The following is described with specific embodiments:

[0063] For example, take the engine control of a certain brand of vehicle as an example. In winter, when parking outdoors overnight in the north, the vehicle is parked in a parking space on the side of the road. The ambient atmospheric pressure is 101kPa, the ambient temperature is -30℃, and the engine coolant temperature is -30℃. According to the instructions of the engine control unit, after starting, in order to quickly reach the optimal working water temperature state, the engine speed is increased to 1400r / min in the warm-up stage (the engine idle speed is 700r / min at normal working water temperature). When the driver starts the vehicle, he starts idling directly. At this time, the engine is in the warm-up process, the engine idle speed is high, the output torque is large, and there will be a strong sense of forward rush when the brake is released. When there are other social vehicles parked in front and behind the parking space, when driving out of the side parking space, the driver always needs to step on the brake pedal hard to control the vehicle, and carefully adjust the vehicle forward and backward, which significantly increases the difficulty of the vehicle moving out of the side parking space, and there is a great risk of collision. For the driver, it significantly increases the operating burden of the vehicle, and at the same time increases the sense of insecurity and tension. The whole control process is not easy and has low friendliness. For this working condition, the present invention can automatically reduce the engine speed to 700r / min at the engine idle speed under normal working water temperature before starting, thereby reducing the output torque, ensuring smooth idle starting of the vehicle and improving the driving experience and friendliness.

[0064] On the other hand, a vehicle starting idle speed automatic control device is provided, comprising:

[0065] A setting module 16 is used to obtain a first idle speed corresponding to a normal working water temperature of the vehicle, and set the first idle speed to an idle threshold value;

[0066] The first idle speed corresponding to the normal working water temperature of the vehicle is the idle speed determined by the engine design parameters of the vehicle at the normal working water temperature of the vehicle. Since the engine is in a cold start state, in order to warm up the engine, the engine idle speed at the cold start should be higher than the first idle speed corresponding to the normal working water temperature of the vehicle. Therefore, the first idle speed is set as the idle threshold value;

[0067] A first acquisition module 17 is used to acquire an engine speed signal after the vehicle is started, and acquire a second idle speed according to the engine speed signal;

[0068] A comparison module 18 is used to compare the second idle speed with the idle threshold value, and when the second idle speed is higher than the idle threshold value, determine that the engine of the vehicle is in a cold start state;

[0069] Among them, the engine speed signal is obtained through the engine speed sensor to determine the current engine idle speed state. When the vehicle is started with a cold engine, the engine idle speed is compared with the engine idle speed at normal working water temperature. The first judgment condition is that the idle speed after the engine is started is higher than the idle speed at normal working water temperature, that is, the engine is in a cold engine start state.

[0070] The processing module 19 obtains a vehicle starting signal, and controls the second idle speed to drop to an idle threshold value according to the vehicle starting signal.

[0071] Optionally, a second acquisition module is used to acquire a first pedal signal when the vehicle brake pedal is not pressed and a second pedal signal when the vehicle brake pedal is pressed;

[0072] Among them, the driver's starting intention is identified by obtaining the vehicle brake pedal signal. Before starting, the driver must first step on the brake pedal to trigger the brake pedal switch and obtain the second pedal signal. Whether the second pedal signal is obtained is the second judgment condition. If the second pedal signal is not received, the control strategy of the engine heat engine is maintained; if the second pedal signal is received, the next step is to identify the gear signal of the automatic transmission switching.

[0073] A third acquisition module is used to acquire a first gear signal of a parking state of the vehicle and a second gear signal of a driving state, wherein the first gear signal includes a P gear signal and an N gear signal, and the second gear signal includes a D gear signal and an R gear signal;

[0074] The starting signal generating module is used to generate a vehicle starting signal according to the second pedal signal and the second gear signal. The processing module controls the engine to reduce the second idle speed to the idle threshold value according to the vehicle starting signal generated by the starting signal generating module and the cold engine starting state determined by the comparing module.

[0075] Among them, the vehicle's automatic transmission gear switching signal is obtained. When the first judgment condition and the second judgment condition are met at the same time, the driver performs a gear shift operation before starting. When the automatic transmission gear signal cuts out the P gear, that is, the gear shift signal is in a non-P state. For quick response, as long as the engine control unit (ECU) recognizes the non-P signal, it is determined that the driver directly enters the starting state after the cold engine is started. The engine control unit (ECU) issues a control command to reduce the engine idle speed, thereby reducing the engine output torque to ensure a smooth start of the vehicle.

[0076] On the other hand, Figure 3 As shown, an electronic device is provided, the electronic device comprising:

[0077] One or more processors 11;

[0078] a storage device for storing one or more programs,

[0079] When the one or more programs are executed by the one or more processors 11, the one or more processors 11 implement any of the above-mentioned methods for automatically controlling the idle speed of a vehicle when it starts.

[0080] Specifically, the storage device is a memory 10, a processor (CPU) 11 and a computer program 14, the computer program 14 is stored in the memory 10, and the processor 11 executes the computer program 14 to implement any one of the above-mentioned vehicle starting idle speed automatic control methods. The control system also includes: a communication interface 13 and a communication bus 12, the processor 11, the communication interface 13, and the memory 10 communicate through the communication bus 12, wherein the communication bus 12 is an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc., and if the memory 10, the processor 11 and the communication interface 13 are integrated on a chip, the memory 10, the processor 11 and the communication interface 13 can communicate with each other through an internal interface.

[0081] The processor 11 may also be a specific integrated circuit or multiple integrated circuits.

[0082] On the other hand, Figure 3 As shown, a computer-readable storage medium 15 is provided, on which a computer program 14 is stored. When the program is executed by a processor 11, a vehicle starting idle speed automatic control method as described above is implemented.

[0083] Specifically, the computer program 14 may include a program code, which includes a computer operation instruction; a memory 10, which is used to store the computer program 14. The memory 10 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory; a communication interface 13, which is used to communicate with other devices such as a client or other servers.

[0084] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for automatically controlling the idle speed of a vehicle when starting, characterized in that: include: Acquire a first idle speed corresponding to a normal working water temperature of the vehicle, and set the first idle speed as an idle threshold value; After the vehicle is started, an engine speed signal is obtained, and a second idle speed is obtained according to the engine speed signal; Comparing the second idle speed with the idle threshold value, and determining that the engine of the vehicle is in a cold engine start state when the second idle speed is higher than the idle threshold value; A vehicle starting signal is obtained, and the second idle speed is controlled to drop to an idle threshold value according to the vehicle starting signal.

2. The method for automatically controlling the vehicle idle speed at start-up according to claim 1, characterized in that: Obtaining the vehicle start signal also includes: Acquire a first pedal signal of a vehicle brake pedal not being pressed and a second pedal signal of a vehicle brake pedal being pressed; Acquire a first gear position signal of a parking state and a second gear position signal of a driving state of the vehicle, wherein the first gear position signal includes a P gear signal and an N gear signal, and the second gear position signal includes a D gear signal and an R gear signal; generating a vehicle starting signal according to a second pedal signal and a second gear position signal; According to the vehicle starting signal and the cold engine starting state, the engine is controlled to reduce the second idle speed to the idle threshold value.

3. The method for automatically controlling the vehicle idle speed at start-up according to claim 2, characterized in that: include: When the first gear position signal is P gear and the second pedal signal is obtained, it is determined that the engine is in a cold start state, and the engine speed is controlled to be the second idle speed.

4. The method for automatically controlling the vehicle idle speed at start-up according to claim 2, characterized in that: include: When the first gear signal is N gear and the second pedal signal is obtained, it is determined that the engine is in a cold start state, and the engine speed is controlled to be a second idle speed.

5. The method for automatically controlling the vehicle idle speed at start-up according to claim 2, characterized in that: include: When the collected gear signal is the second gear signal, the collected pedal signal is the second pedal signal, and the engine is in a cold start state, the engine speed is controlled to be an idle threshold value.

6. The method for automatically controlling the vehicle idle speed at start-up according to claim 2, characterized in that: include: When the second pedal signal is not collected and / or it is determined that the engine is not in a cold start state, the engine speed maintains the original operating state.

7. A vehicle starting idle speed automatic control device, characterized in that: include: A setting module, used for obtaining a first idle speed corresponding to a normal working water temperature of the vehicle, and setting the first idle speed as an idle threshold value; A first acquisition module is used to acquire an engine speed signal after the vehicle is started, and acquire a second idle speed according to the engine speed signal; A comparison module, used for comparing the second idle speed with the idle threshold value, and determining that the engine of the vehicle is in a cold start state when the second idle speed is higher than the idle threshold value; The processing module obtains a vehicle starting signal and controls the second idle speed to drop to an idle threshold value according to the vehicle starting signal.

8. The vehicle starting idle speed automatic control device according to claim 7, characterized in that: include: A second acquisition module, used for acquiring a first pedal signal when the vehicle brake pedal is not pressed and a second pedal signal when the vehicle brake pedal is pressed; A third acquisition module is used to acquire a first gear signal of a parking state of the vehicle and a second gear signal of a driving state, wherein the first gear signal includes a P gear signal and an N gear signal, and the second gear signal includes a D gear signal and an R gear signal; The starting signal generating module is used to generate a vehicle starting signal according to the second pedal signal and the second gear signal. The processing module controls the engine to reduce the second idle speed to the idle threshold value according to the vehicle starting signal generated by the starting signal generating module and the cold engine starting state determined by the comparing module.

9. An electronic device, characterized in that: The electronic device comprises: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement a vehicle starting idle speed automatic control method as described in any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, a vehicle starting idle speed automatic control method as described in any one of claims 1 to 6 is implemented.

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