AMT automatic neutral gear returning and automatic parking cooperative control system and method

Abstract

The invention relates to an AMT automatic neutral gear returning and automatic parking cooperative control system and method. The method comprises the steps that whether a vehicle is in a running state or not is judged according to a brake pedal signal, an accelerator pedal signal or a real-time vehicle speed signal; and whether the vehicle is in a normal parking state or not is judged according to the gear state signal and the hand brake state signal, if yes, the automatic neutral gear returning and automatic parking control process is not started, and if not, the automatic neutral gear returning and automatic parking control process is started. Aiming at the situations that a driver neglects and operates irregularly in the actual situation, the driver forgets to pull a brake to cause car sliding or forgets to return to the neutral gear to touch an accelerator by mistake to cause danger and the like during temporary parking, safe and effective automatic neutral gear return and automatic parking can be ensured under the condition that the driver does not return to the neutral gear or is not parked during parking; and the safety of the vehicle and the driver is further ensured.

Description

Technical Field

[0001] This application relates to the field of automatic transmissions, and specifically, to a coordinated control system and method for automatic neutral return and automatic parking of an AMT Background Art

[0002] Automatic transmissions (Auto Transmission, AMT) have been widely used to improve driving comfort, reduce labor intensity, and optimize fuel economy. However, in actual operation, they often face many complex working conditions, such as parking, going up and down slopes, traffic jams, etc. In these situations, the shifting and parking functions of the AMT are particularly important.

[0003] When a traditional AMT stops, the driver needs to manually shift the vehicle into neutral and pull up the handbrake to prevent the vehicle from rolling. However, in actual situations, due to driver negligence and improper operation, there may be situations such as forgetting to pull the handbrake when temporarily parking, resulting in the vehicle rolling, or forgetting to return to neutral and accidentally touching the accelerator, which is dangerous. Therefore, in order to further improve vehicle safety, the introduction of coordinated control of automatic neutral return and automatic parking of the AMT can effectively reduce safety risks caused by driver negligence or improper operation.

[0004] Existing automatic parking technologies only focus on how the whole vehicle should perform automatic parking and do not consider the current transmission gear position. If automatic parking is performed when the transmission is in gear, it is easy for the driver to step on the accelerator without considering the parking state, which will have an adverse impact on the engine, parking system, etc., causing unnecessary wear or damage. Summary of the Invention

[0005] To overcome at least one deficiency in the prior art, this application provides a coordinated control system and method for automatic neutral return and automatic parking of an AMT.

[0006] In a first aspect, a coordinated control method for automatic neutral return and automatic parking of an AMT is provided, including:

[0007] Step 1, obtain a gear position status signal, a handbrake status signal, a brake pedal signal, an accelerator pedal signal, a real-time vehicle speed signal, and a time status signal;

[0008] Step 2, determine whether the vehicle is in a driving state according to the brake pedal signal, the accelerator pedal signal, or the real-time vehicle speed signal. If so, do not start the automatic neutral return and automatic parking control process. If not, execute Step 3;

[0009] Step 3, determine whether the vehicle is in a normal parking state according to the gear position status signal and the handbrake status signal. If so, do not start the automatic neutral return and automatic parking control process. If not, start the automatic neutral return and automatic parking control process; the automatic neutral return and automatic parking control process includes:

[0010] If the parking brake status signal is 1 and the gear is not in neutral, after the time condition is determined to be met according to the time status signal, an automatic return to neutral command is output to the AMT;

[0011] If the handbrake status signal is 0 and the gear is in neutral, after determining that the time condition is met according to the time status signal, an automatic parking command is output to the automatic parking system;

[0012] If the handbrake status signal is 0 and the gear is not in neutral, after determining that the time condition is met according to the time status signal, an automatic return to neutral command is output to the AMT and an automatic parking command is output to the automatic parking system.

[0013] In one embodiment, determining whether the vehicle is in a driving state according to a brake pedal signal, an accelerator pedal signal, or a real-time vehicle speed signal includes:

[0014] If the brake pedal signal is not 0, or the accelerator pedal signal is not 0, or the real-time vehicle speed signal is not 0, it is determined that the vehicle is in a driving state.

[0015] In one embodiment, judging whether the vehicle is in a normal parking state according to the gear state signal and the handbrake state signal includes:

[0016] If the handbrake status signal is 1, and the gear is determined to be neutral according to the gear status signal, the vehicle is judged to be in a normal parking state.

[0017] In the second aspect, an AMT automatic return to neutral gear and automatic parking coordinated control system is provided to implement the above-mentioned AMT automatic return to neutral gear and automatic parking coordinated control method.

[0018] In a third aspect, an automatic parking system is provided, comprising: a parking air reservoir, a first solenoid valve, a differential valve, a second solenoid valve and a brake air chamber; the first solenoid valve is provided with a first solenoid valve air inlet and a first solenoid valve air outlet; the second solenoid valve is provided with a second solenoid valve air inlet and a second solenoid valve air outlet; the differential valve is provided with a differential valve first air inlet, a differential valve second air inlet and a differential valve air outlet;

[0019] After receiving the automatic parking command, the automatic parking system controls the first solenoid valve and the second solenoid valve to be energized at the same time;

[0020] When the first solenoid valve is powered on, the air inlet of the first solenoid valve is disconnected from the air outlet of the first solenoid valve, the first air inlet of the differential valve no longer enters high-pressure gas, there is an air pressure difference between the first air inlet of the differential valve and the second air inlet of the differential valve, and the second air inlet of the differential valve stops taking in air;

[0021] After the second solenoid valve is energized, the intake port and the outlet port of the second solenoid valve are disconnected, and the high-pressure gas in the brake chamber is discharged through the outlet port of the second solenoid valve, thereby realizing the air cut-off and parking of the brake chamber.

[0022] In one embodiment, the system further includes a hand brake valve. When normal parking is performed through the hand brake valve, no high-pressure gas enters the second intake port of the differential valve, there is a pressure difference between the first intake port and the second intake port of the differential valve, and the intake of the first intake port of the differential valve stops.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] 1. In view of the driver's negligence and non-standard operation in actual situations, such as forgetting to pull the handbrake when temporarily parking, resulting in vehicle slipping, or forgetting to return to neutral and accidentally touching the accelerator, which may cause danger. The present application ensures that the vehicle can safely and effectively automatically return to neutral and automatically park when the vehicle is not in neutral or parked, further ensuring the safety of the vehicle and the driver.

[0025] 2. The present application does not require additional sensors to receive demand signals or states. It can judge the vehicle state based on the existing signals of the AMT, and then judge whether to issue commands for automatic neutral return and automatic parking.

[0026] 3. In the prior art, automatic parking only considers one condition of whether to park, without considering the gear position of the automatic transmission, and does not fully consider the safety of the vehicle and the driver. The present application conducts collaborative judgment and control on the gear position and the parking system through the automatic neutral return and automatic parking collaborative control system, which more fully ensures the safety of the vehicle and the driver.

[0027] 4. The present application is effective for the pneumatic parking system and is also effective for commercial vehicle models equipped with an electronic handbrake and matched with the AMT. The automatic neutral return and automatic parking collaborative control system can be integrated into the AMT software control. By updating the AMT software, it can be adapted to the AMT of commercial vehicles with an electronic handbrake. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present application can be better understood by referring to the description given below in conjunction with the accompanying drawings. The drawings, together with the following detailed description, are included in this specification and form a part of this specification. In the drawings:

[0029] Figure 1 The schematic diagram of the AMT automatic neutral return and automatic parking collaborative control method is shown;

[0030] Figure 2 The logic judgment flowchart of the AMT automatic neutral return and automatic parking collaborative control method is shown;

[0031] Figure 3The flowchart of the automatic neutral return operation is shown;

[0032] Figure 4 The schematic diagram of the automatic parking system is shown.

[0033] Reference numerals:

[0034] 1 - parking air reservoir, 2 - first check valve, 3 - second check valve, 4 - first solenoid valve, 5 - hand brake valve, 6 - differential valve, 7 - second solenoid valve, 8 - brake chamber, 9 - automatic neutral return and automatic parking collaborative control system, 10 - first solenoid valve air inlet, 11 - first solenoid valve air outlet, 12 - first differential valve air inlet, 13 - second differential valve air inlet, 14 - differential valve air outlet, 15 - second solenoid valve air inlet, 16 - second solenoid valve air outlet. Detailed implementation manners

[0035] In the following, exemplary embodiments of the present application will be described with reference to the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual embodiments are described in the specification. However, it should be understood that many embodiment-specific decisions may be made during the development of any such actual embodiment to achieve the specific goals of the developer, and these decisions may vary with different embodiments.

[0036] Here, it should also be noted that in order to avoid obscuring the present application with unnecessary details, only the device structures closely related to the solution of the present application are shown in the drawings, and other details less related to the present application are omitted.

[0037] It should be understood that the present application is not limited to the described embodiments only due to the following description with reference to the drawings. In this document, where feasible, embodiments can be combined with each other, features can be replaced or borrowed between different embodiments, and one or more features can be omitted in one embodiment.

[0038] The embodiment of the present application provides an AMT automatic neutral return and automatic parking collaborative control method, Figure 1 The schematic diagram of the AMT automatic neutral return and automatic parking collaborative control method is shown, Figure 2 The logic judgment flowchart of the AMT automatic neutral return and automatic parking collaborative control method is shown, see Figure 1 and Figure 2 , and the method mainly includes the following steps:

[0039] Step 1, obtain the gear state signal, handbrake state signal, brake pedal signal, accelerator pedal signal, real-time vehicle speed signal, and time state signal.

[0040] Step 2: Determine whether the vehicle is in a driving state based on the brake pedal signal, the accelerator pedal signal, or the real-time vehicle speed signal. If so, do not start the automatic neutral return and automatic parking control processes. If not, execute Step 3.

[0041] Here, if the brake pedal signal is not 0, or the accelerator pedal signal is not 0, or the real-time vehicle speed signal is not 0, it is determined that the vehicle is in a driving state.

[0042] Step 3: Determine whether the vehicle is in a normal parking state based on the gear state signal and the handbrake state signal. If so, do not start the automatic neutral return and automatic parking control processes. If not, start the automatic neutral return and automatic parking control processes. Here, if the handbrake state signal is 1 and the gear is determined to be in neutral according to the gear state signal, it is determined that the vehicle is in a normal parking state.

[0043] The automatic neutral return and automatic parking control processes include:

[0044] If the handbrake state signal is 1 and the gear is not in neutral (N gear), after determining that the time condition is satisfied according to the time state signal, output an automatic neutral return command to the AMT.

[0045] If the handbrake state signal is 0 and the gear is in neutral (N gear), after determining that the time condition is satisfied according to the time state signal, output an automatic parking command to the automatic parking system.

[0046] If the handbrake state signal is 0 and the gear is not in neutral (N gear), after determining that the time condition is satisfied according to the time state signal, output an automatic neutral return command to the AMT and an automatic parking command to the automatic parking system.

[0047] Specifically, after receiving the automatic neutral return command, the AMT performs an automatic neutral return operation. Figure 3 The flowchart showing the automatic neutral return operation is shown in Figure 3 , including:

[0048] The AMT issues a command to return the target gear to N gear; the AMT controls the clutch to act; the AMT disengages the existing gear and engages N gear.

[0049] The embodiment of the present application also provides an AMT automatic neutral return and automatic parking collaborative control system, which is used to implement the AMT automatic neutral return and automatic parking collaborative control method in the foregoing embodiment.

[0050] The embodiment of the present application also provides an automatic parking system, which performs an automatic parking operation after receiving the automatic parking command. Figure 4 The schematic diagram of the automatic parking system is shown in Figure 4The automatic parking system comprises: a parking air reservoir 1, a first solenoid valve 4, a differential valve 6, a second solenoid valve 7 and a brake air chamber 8; the first solenoid valve 4 is provided with a first solenoid valve air inlet 10 and a first solenoid valve air outlet 11; the second solenoid valve 7 is provided with a second solenoid valve air inlet 15 and a second solenoid valve air outlet 16; the differential valve 6 is provided with a differential valve first air inlet 12, a differential valve second air inlet 13 and a differential valve air outlet 14;

[0051] After receiving the automatic parking command, the automatic parking system controls the first solenoid valve 4 and the second solenoid valve 7 to be energized at the same time;

[0052] When the first solenoid valve 4 is powered on, the first solenoid valve air inlet 10 is disconnected from the first solenoid valve air outlet 11, the first air inlet 12 of the differential valve no longer enters high-pressure gas, there is an air pressure difference between the first air inlet 12 of the differential valve and the second air inlet 13 of the differential valve, and the second air inlet 13 of the differential valve stops taking in air;

[0053] When the second solenoid valve 7 is energized, the second solenoid valve air inlet 15 is disconnected from the second solenoid valve air outlet 16, and the high-pressure gas in the brake air chamber 8 is discharged through the second solenoid valve air outlet 16, thereby achieving air-off parking in the brake air chamber 8.

[0054] Furthermore, the automatic parking system also includes a hand brake valve 5. When normal parking is performed through the hand brake valve 5, the second air inlet 13 of the differential valve no longer enters the high-pressure gas, there is an air pressure difference between the first air inlet 12 of the differential valve and the second air inlet 13 of the differential valve, and the first air inlet 12 of the differential valve stops taking in air.

[0055] When the brake pedal signal, throttle status signal and real-time vehicle speed signal are all 0, the automatic neutral shift and automatic parking cooperative control system controls the second solenoid valve 7 to be energized, the second solenoid valve air inlet 15 is disconnected from the second solenoid valve air outlet 16, and the high-pressure gas in the brake air chamber 8 is discharged through the exhaust port of the second solenoid valve 7, thereby achieving brake air chamber 8 de-airing and parking.

[0056] After the automatic return to neutral gear and automatic parking cooperative control system are working, if the driver releases the parking state or the neutral state, the automatic return to neutral gear and automatic parking cooperative control system releases the automatic parking control by obtaining the brake pedal signal or the gear state signal, that is, the first solenoid valve 4 and the second solenoid valve 7 are powered off, the first solenoid valve air inlet 10 and the first solenoid valve air outlet 11 are restored to communication, the second solenoid valve air inlet 15 and the second solenoid valve air outlet 16 are restored to communication, and the high-pressure gas enters the brake air chamber 8, thereby releasing the brake.

[0057] In summary, this application has the following beneficial effects:

[0058] 1. In view of the negligence and non-standard operations of drivers in actual situations, such as forgetting to pull the handbrake when temporarily parking, resulting in vehicle rollback, or forgetting to return to neutral and accidentally touching the accelerator, which may cause danger, this application ensures safe and effective automatic return to neutral and automatic parking when the vehicle is not in neutral or parked, further ensuring the safety of the vehicle and the driver.

[0059] 2. This application does not require additional sensors to receive demand signals or states. It can judge the vehicle state based on the existing signals of AMT, and then determine whether to issue commands for automatic return to neutral and automatic parking.

[0060] 3. In the prior art, automatic parking only considers one condition of whether the vehicle is parked, without considering the gear position of the automatic transmission, and the safety of the vehicle and the driver is not fully considered. This application conducts collaborative judgment and control on the gear and parking system through an automatic return to neutral and automatic parking collaborative control system, more fully ensuring the safety of the vehicle and the driver.

[0061] 4. This application is effective for the pneumatic parking system and also for commercial vehicle models equipped with an electronic handbrake and matched with AMT. The automatic return to neutral and automatic parking collaborative control system can be integrated into the AMT software control. By updating the AMT software, it can be adapted to the AMT of commercial vehicles with an electronic handbrake.

[0062] The above are only various implementation manners of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art in the technical field disclosed by this application can easily think of changes or substitutions within the technical scope disclosed by this application, and all should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claimed rights.

Claims

1. An AMT automatic return to neutral gear and automatic parking collaborative control method, characterized in that Including: Step 1: Obtain the gear position status signal, handbrake status signal, brake pedal signal, accelerator pedal signal, real-time vehicle speed signal, and time status signal; Step 2: Determine whether the vehicle is in a driving state according to the brake pedal signal, the accelerator pedal signal, or the real-time vehicle speed signal. If so, do not start the automatic neutral return and automatic parking control processes. If not, execute Step 3; Step 3: Determine whether the vehicle is in a normal parking state according to the gear position status signal and the handbrake status signal. If so, do not start the automatic neutral return and automatic parking control processes. If not, start the automatic neutral return and automatic parking control processes; The automatic neutral return and automatic parking control processes include: If the handbrake status signal is 1 and the gear is not in neutral, after determining that the time condition is satisfied according to the time status signal, output an automatic neutral return command to the AMT; If the handbrake status signal is 0 and the gear is in neutral, after determining that the time condition is satisfied according to the time status signal, output an automatic parking command to the automatic parking system; If the handbrake status signal is 0 and the gear is not in neutral, after determining that the time condition is satisfied according to the time status signal, output an automatic neutral return command to the AMT and an automatic parking command to the automatic parking system.

2. The method according to claim 1, characterized in that, Wherein, Determining whether the vehicle is in a driving state according to the brake pedal signal, the accelerator pedal signal, or the real-time vehicle speed signal includes: If the brake pedal signal is not 0, or the accelerator pedal signal is not 0, or the real-time vehicle speed signal is not 0, it is determined that the vehicle is in a driving state.

3. The method according to claim 1, wherein Wherein, Determining whether the vehicle is in a normal parking state according to the gear position status signal and the handbrake status signal includes: If the handbrake status signal is 1 and it is determined that the gear is in neutral according to the gear position status signal, it is determined that the vehicle is in a normal parking state.

4. An AMT automatic return to neutral and automatic parking collaborative control system, characterized in that, For implementing the AMT automatic neutral return and automatic parking collaborative control method according to any one of claims 1-3.

5. An automatic parking system, characterized in that, Including: A parking air storage tank (1), a first solenoid valve (4), a differential valve (6), a second solenoid valve (7), and a brake chamber (8); The first solenoid valve (4) is provided with a first solenoid valve air inlet (10) and a first solenoid valve air outlet (11); The second solenoid valve (7) is provided with a second solenoid valve air inlet (15) and a second solenoid valve air outlet (16); The differential valve (6) is provided with a differential valve first air inlet (12), a differential valve second air inlet (13), and a differential valve air outlet (14); After the automatic parking system receives the automatic parking command, control the first solenoid valve (4) and the second solenoid valve (7) to be energized simultaneously; When the first solenoid valve (4) is energized, the first solenoid valve air inlet (10) is disconnected from the first solenoid valve air outlet (11), the differential valve first air inlet (12) no longer receives high-pressure gas, there is a pressure difference between the differential valve first air inlet (12) and the differential valve second air inlet (13), and the differential valve second air inlet (13) stops admitting air; After the second solenoid valve (7) is energized, the intake port (15) of the second solenoid valve is disconnected from the outlet port (16) of the second solenoid valve, and the high-pressure gas in the brake chamber (8) is discharged through the outlet port (16) of the second solenoid valve, thereby realizing the cut-off of the air supply of the brake chamber (8) for parking.

6. The system according to claim 5, wherein The system further includes a hand brake valve (5). When normal parking is performed through the hand brake valve (5), high-pressure gas no longer enters the second intake port (13) of the differential valve, there is a pressure difference between the first intake port (12) and the second intake port (13) of the differential valve, and the intake of the first intake port (12) of the differential valve stops.

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