A hydrogen internal combustion engine matching AMT vehicle idle start optimization control method

Abstract

The present application relates to a kind of hydrogen internal combustion engine matching AMT vehicle idle start optimization control method, comprising the following steps: when vehicle idle start, obtain gear signal, foot brake signal and hand brake signal;When gear signal, foot brake signal and hand brake signal all satisfy idle start demand condition, vehicle enters idle start control mode;When vehicle enters idle start control mode, obtain slope signal;According to slope signal, and in combination with PID algorithm, dynamic control engine target idle speed;The present application solves the problem that hydrogen internal combustion engine low-speed low load power response is poor, AMT vehicle idle state cannot start, start fluctuation, slope is easy to slide car.

Description

Technical Field

[0001] This invention relates to the field of hydrogen internal combustion engine vehicle control technology, and in particular to an optimized idle start control method for hydrogen internal combustion engine matched AMT vehicles. Background Technology

[0002] Hydrogen, as a zero-carbon fuel, is being developed simultaneously in the heavy-duty commercial vehicle sector through multiple hydrogen power routes, including hydrogen fuel cells, hydrogen internal combustion engines, and hydrogen-blended internal combustion engines. However, hydrogen has physical characteristics such as a low ignition point, rapid combustion speed, and the potential for detonation. Hydrogen internal combustion engines, employing direct injection and spark plug ignition technology, suffer from weaker power and poorer low-speed response compared to diesel engines.

[0003] In recent years, heavy-duty trucks equipped with automatic manual transmissions (AMT) have gradually replaced manual transmission (MT) models. However, the poor low-speed, low-load responsiveness of hydrogen internal combustion engines leads to engine vibration and difficulties in brake and accelerator engagement when starting from idle at traffic lights, on slopes, or in congested areas, severely impacting vehicle safety and comfort. Furthermore, the development of energy-saving and consumption-reducing technologies, particularly the adoption of low-idle technology in engines, has further exacerbated this technical challenge. Currently, the industry has not yet solved the problem of precise idle speed control for hydrogen internal combustion engine vehicles when starting on different slopes. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing an optimized idle start control method for hydrogen internal combustion engines matched with AMT vehicles.

[0005] This invention is achieved using the following technical solution:

[0006] An optimized idle start control method for hydrogen internal combustion engines matched with AMT vehicles includes the following steps:

[0007] When the vehicle starts from idle speed, it acquires the gear position signal, foot brake signal, and handbrake signal; when the gear position signal, foot brake signal, and handbrake signal all meet the idle speed start requirements, the vehicle enters the idle speed start control mode.

[0008] When the vehicle enters the idle start control mode, the slope signal is acquired; based on the slope signal and combined with the PID algorithm, the target idle speed of the engine is dynamically controlled.

[0009] As a further explanation of the invention, when the gear position signal, the foot brake signal, and the handbrake signal all meet the idle start requirement conditions, the vehicle enters the idle start control mode; including:

[0010] When the gear is in forward or reverse and both the foot brake and hand brake are disengaged, the vehicle enters the idle start control mode.

[0011] As a further explanation of the invention, based on the ramp signal and in conjunction with a PID algorithm, the target idle speed of the engine is dynamically adjusted, including:

[0012] Obtain the current gradient of the road the vehicle is traveling on;

[0013] Based on the current slope, control the engine idle speed to increase to the target idle speed at the current slope.

[0014] The engine speed is dynamically controlled based on the target idle speed of the engine combined with the PID algorithm, so that the target idle speed of the engine is within the preset range.

[0015] As a further explanation of the invention, the range of values ​​for different slopes corresponds to the preset range of different target idle speeds of the engine.

[0016] As a further explanation of the invention, a method for determining whether a vehicle has started idling:

[0017] Acquire the accelerator pedal signal to determine whether the accelerator pedal is pressed;

[0018] If so, the engine enters TSC torque control mode;

[0019] If not, start the vehicle from idle.

[0020] As a further explanation of the invention, the engine entering the TSC torque control mode includes:

[0021] When the vehicle is starting normally, control the engine torque to output the required torque.

[0022] When the vehicle does not need to start, the engine speed is controlled to output at a low idle speed.

[0023] As a further explanation of the invention, the vehicle controller controls the engine to operate based on accelerator pedal signals, gear signals, foot brake signals, handbrake signals, slope signals, and engine execution signals;

[0024] Vehicle maintenance is performed when any signal malfunctions.

[0025] Compared with the prior art, the present invention has the following beneficial technical effects:

[0026] This invention collects signals from the accelerator pedal, gear position, foot brake, handbrake, and slope, and formulates control logic to improve engine speed and torque output under idling conditions. This enables a smooth start for a hydrogen internal combustion engine paired with an AMT vehicle under idling conditions, solving the problems of poor power response of hydrogen internal combustion engines at low speeds and low loads, vehicle start-up vibration, and inability to start. At the same time, it maintains the low-speed characteristics of the hydrogen internal combustion engine under idling conditions when vehicle start-up is not required, thereby ensuring the fuel economy of the vehicle. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the method flow of the present invention. Detailed Implementation

[0028] like Figure 1 As shown, an optimized idle start control method for a hydrogen internal combustion engine matched with an AMT vehicle includes the following steps:

[0029] When the vehicle starts from idle speed, it acquires gear position signal, foot brake signal and handbrake signal; when the gear position signal, foot brake signal and handbrake signal all meet the requirements for starting from idle speed, the vehicle enters the idle speed start control mode.

[0030] When the vehicle enters the idle start control mode, the slope signal is acquired; based on the slope signal and combined with the PID algorithm, the target idle speed of the engine is dynamically controlled.

[0031] When the gear position signal, foot brake signal, and handbrake signal all meet the conditions for idle speed start, the vehicle enters the idle speed start control mode; including:

[0032] When the gear is in forward or reverse and both the foot brake and hand brake are disengaged, the vehicle enters the idle start control mode.

[0033] Based on the ramp signal and combined with a PID algorithm, the target engine idle speed is dynamically adjusted, including:

[0034] Obtain the current gradient of the road the vehicle is traveling on;

[0035] Based on the current slope, control the engine idle speed to increase to the target idle speed at the current slope.

[0036] The engine speed is dynamically controlled based on the target idle speed of the engine combined with the PID algorithm, so that the target idle speed of the engine is within the preset range.

[0037] Different slope values ​​correspond to different preset ranges of target idle speed for the engine. These preset ranges can be calibrated, determined through engineering calibration based on specific vehicles, operating conditions, and engine models. Furthermore, they must be combined with PID control methods to ensure the program's scientific rationality.

[0038] Methods to determine if a vehicle starts idling:

[0039] Acquire the accelerator pedal signal to determine whether the accelerator pedal is pressed;

[0040] If so, the engine enters TSC torque control mode;

[0041] If not, start the vehicle from idle.

[0042] The engine enters TSC torque control mode including:

[0043] When the vehicle is starting normally, control the engine torque to output the required torque.

[0044] When the vehicle does not need to start, controlling the engine speed to output at a low idle speed can maintain a low idle speed technical state, thereby ensuring that the overall hydrogen consumption of the vehicle does not increase.

[0045] The vehicle controller controls the engine to operate based on accelerator pedal signals, gear signals, foot brake signals, handbrake signals, slope signals, and engine execution signals.

[0046] Vehicle maintenance is performed when any signal malfunctions.

[0047] Taking a 6×4 tractor unit equipped with a 13L 540hp hydrogen internal combustion engine and a 16-speed AMT transmission as an example:

[0048] The vehicle controller collects accelerator pedal signals, gear signals, foot brake signals, handbrake signals, and slope signals, and determines whether the following conditions are met by analyzing the message status:

[0049] Monitoring accelerator pedal opening signal: ≤1%; indicates that the driver has not pressed the pedal;

[0050] Transmission gear position signal: D gear; indicates that the gear is in drive;

[0051] Vehicle braking signal: Released; indicates that the vehicle is not braking;

[0052] Ramp signals are divided into three categories:

[0053] -0.5% to 0.5%, triggering an increase in idle speed from 600 rpm to 750 ± 50 rpm;

[0054] 0.5% to 2.5%, triggering an increase in idle speed from 600 rpm to 850 ± 50 rpm;

[0055] 2.5% to 5%, triggering an increase in idle speed from 600 rpm to 950 ± 50 rpm;

[0056] If all the above conditions are met, the vehicle enters the idle speed start control mode. The vehicle controller dynamically selects the target idle speed according to the slope and adjusts the engine output through PID parameters to ensure that the speed is stable within the calibrated range, thereby achieving a smooth start on flat roads and under different slope conditions.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for optimizing idle speed start-up control of a hydrogen internal combustion engine matched with an AMT vehicle, characterized in that, Includes the following steps: When the vehicle starts from idle speed, it acquires the gear position signal, foot brake signal, and handbrake signal; when the gear position signal, foot brake signal, and handbrake signal all meet the idle speed start requirements, the vehicle enters the idle speed start control mode. When the vehicle enters the idle start control mode, the slope signal is acquired; based on the slope signal and combined with the PID algorithm, the target idle speed of the engine is dynamically controlled.

2. The idle speed start optimization control method for hydrogen internal combustion engine matched with AMT vehicle as described in claim 1, characterized in that, When the gear position signal, the foot brake signal, and the handbrake signal all meet the idle start requirement, the vehicle enters the idle start control mode; including: When the gear is in forward or reverse and both the foot brake and hand brake are disengaged, the vehicle enters the idle start control mode.

3. The idle speed start optimization control method for hydrogen internal combustion engine matched with AMT vehicle as described in claim 2, characterized in that, Based on the ramp signal and in conjunction with a PID algorithm, the target idle speed of the engine is dynamically adjusted, including: Obtain the current gradient of the road the vehicle is traveling on; Based on the current slope, control the engine idle speed to increase to the target idle speed at the current slope. The engine speed is dynamically controlled based on the target idle speed of the engine combined with the PID algorithm, so that the target idle speed of the engine is within the preset range.

4. The idle speed start optimization control method for hydrogen internal combustion engine matched with AMT vehicle as described in claim 3, characterized in that, Different slope values ​​correspond to different preset ranges of target idle speed for the engine.

5. The idle speed start optimization control method for hydrogen internal combustion engine matched with AMT vehicle as described in claim 4, characterized in that, Methods to determine if a vehicle starts idling: Acquire the accelerator pedal signal to determine whether the accelerator pedal is pressed; If so, the engine enters TSC torque control mode; If not, start the vehicle from idle.

6. The idle start optimization control method for hydrogen internal combustion engine matched with AMT vehicle as described in claim 5, characterized in that, The engine enters TSC1 torque control mode including: When the vehicle is starting normally, control the engine torque to output the required torque. When the vehicle does not need to start, the engine speed is controlled to output at a low idle speed.

7. The idle speed start optimization control method for hydrogen internal combustion engine matched with AMT vehicle as described in claim 6, characterized in that, The vehicle controller controls the engine to operate based on accelerator pedal signals, gear signals, foot brake signals, handbrake signals, slope signals, and engine execution signals. Vehicle maintenance is performed when any signal malfunctions.

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