Vehicle control system and method

Abstract

The invention discloses a vehicle control system and method, and belongs to the technical field of vehicle control. The system comprises an accelerator pedal, an engine control unit, a gear shifting switch, a reversing proportional electromagnetic valve, a gear shifting proportional electromagnetic valve, a driving controller and an emergency relay. The driving controller calculates the rotating speed of the engine according to the accelerator percentage sent by the engine control unit and controls the proportional electromagnetic valve, so that smooth gear shifting and driving are realized; when the running controller breaks down, the emergency relay switches the running controller into an emergency mode, the gear shifting switch directly controls the reversing proportional electromagnetic valve and disconnects the gear shifting proportional electromagnetic valve, meanwhile, the engine control unit controls the rotating speed directly according to an accelerator pedal, emergency running is guaranteed, and idling brake flameout is prevented. According to the system, the stability and comfort of vehicle starting and gear shifting are effectively improved on the basis that original vehicle wire harnesses and ECU programs are reserved.

Description

Technical Field

[0001] This invention belongs to the field of vehicle control technology, and particularly relates to a vehicle control system and method. Background Technology

[0002] Vehicles typically have different operating components, such as a chassis for driving and a superstructure for operating the equipment, both powered by an engine. For example... Figure 1 As shown, the accelerator pedal B1 is electrically connected to the engine control unit (ECU), and the ECU is electrically connected to the fuel injection valve. When the engine starts, if the accelerator pedal B1 is not depressed, the ECU controls the fuel injection valve to output a default low fuel injection quantity, maintaining the engine speed at a low speed. When the accelerator pedal B1 is depressed, the angle of depression increases, the fuel injection quantity output by the ECU-controlled fuel injection valve also increases, the engine speed increases, and the speed of the downstream working device connected to the engine output shaft also increases, thereby increasing the vehicle's working speed, such as accelerating chassis movement or accelerating superstructure operations. Simultaneously, the shift switch S1 is directly connected to the reversing switch solenoid valve Y1 and the shift switch solenoid valve Y2. When the operator needs to control the vehicle's movement, they can use the shift switch S1 to move forward and backward, as well as shift gears.

[0003] However, both the reversing switch solenoid valve and the shift switch solenoid valve are controlled by on / off signals, and can only perform discrete "on" or "off" operations, resulting in sudden changes in vehicle speed when starting and shifting gears, and poor driving stability and comfort. Summary of the Invention

[0004] This invention provides a vehicle control system and method that can be used to solve the problem in the prior art where the vehicle speed changes abruptly when starting and shifting gears, resulting in poor driving stability and comfort.

[0005] In a first aspect, the present invention provides a vehicle control system, including an accelerator pedal, an engine control unit, a shift switch, a reversing ratio solenoid valve and a shift ratio solenoid valve, and also includes a driving controller and an emergency relay. The engine control unit is electrically connected to the accelerator pedal and the driving controller respectively, and is used to read the accelerator pedal depressing angle to calculate the throttle percentage, and send the throttle percentage to the driving controller; The driving controller is used to calculate the engine speed based on the throttle percentage and send the speed to the engine control unit to control the engine speed, and to control the reversing ratio solenoid valve and the shift ratio solenoid valve based on the gear position information of the shift switch and the engine speed. The emergency relay is configured as follows: When the driving controller is working normally, the shift switch, the reversing ratio solenoid valve and the shift ratio solenoid valve are electrically connected to the driving controller so that the driving controller controls the reversing ratio solenoid valve and the shift ratio solenoid valve according to the gear position information of the shift switch. When the driving controller malfunctions, the shift switch is electrically connected to the reversing ratio solenoid valve, and the shift ratio solenoid valve is disconnected from the shift switch. The engine control unit is then switched to directly control the engine speed based on the accelerator pedal depressing angle.

[0006] For example, the first aspect also includes a brake pressure switch and a brake relay electrically connected to the brake pressure switch; The brake pressure switch is used to control the brake relay to operate when the brake pedal is pressed, thereby disconnecting the shift switch from the shift ratio solenoid valve and putting the vehicle in neutral.

[0007] For example, the first aspect also includes an engine speed switch and a speed relay; The engine speed switch is used to detect the engine speed and control the speed relay to operate when the engine speed exceeds a preset speed threshold, so as to restore the connection between the shift switch and the reversing ratio solenoid valve.

[0008] For example, the driving controller is also configured to perform a self-test after power-on, and when the self-test is normal, send a throttle control command to the engine control unit and simultaneously energize the emergency relay coil; when the self-test fails, send a throttle control command to the engine control unit and de-energize the emergency relay coil.

[0009] For example, the engine control unit calculates the throttle percentage according to the following formula: ; Where k is the current throttle percentage; a is the current angle at which the throttle pedal is pressed; a1 is the initial position angle of the throttle pedal; and a2 is the final position angle of the throttle pedal.

[0010] For example, the driving controller calculates the engine speed according to the following formula: ; Where n is the engine speed corresponding to the current throttle percentage k; n max n is the engine's maximum speed; min This is the engine's minimum speed.

[0011] In a second aspect, the present invention provides a vehicle control method based on the vehicle control system described in the first aspect, comprising: Obtain the accelerator pedal depress angle to calculate the throttle percentage; Calculate engine speed based on throttle percentage; When the driving controller is working normally, the shift switch is electrically connected to the driving controller so that the driving controller controls the reversing ratio solenoid valve and the shift ratio solenoid valve according to the gear position information of the shift switch and the engine speed. In the event of a malfunction in the driving controller, the shift switch is directly electrically connected to the reversing ratio solenoid valve via an emergency relay, and the reversing ratio solenoid valve is disconnected from the shift switch. Additionally, the engine control unit is switched to directly control the engine speed based on the accelerator pedal depressing angle.

[0012] Thirdly, the present invention provides a computer device including a processor and a memory; wherein the processor executes a computer program stored in the memory to implement the steps of the vehicle control method described in the second aspect.

[0013] Fourthly, the present invention provides a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, it implements the steps of the vehicle control method described in the second aspect.

[0014] Fifthly, the present invention provides a computer program product comprising computer-executable instructions or a computer program, wherein when the computer-executable instructions or the computer program are executed by a processor, the steps of the vehicle control method described in the second aspect are implemented.

[0015] This invention provides a vehicle control system and method. The system achieves engine speed control with minimal changes, without altering the original component connections or modifying the engine ECU's internal program. This prevents sudden speed changes during vehicle start-up and gear shifting, improving vehicle stability and comfort. Furthermore, when the driving controller malfunctions, it can control engine speed and temporarily control gear shifting, while also preventing engine stalling caused by idling and braking in emergency mode. Attached Figure Description

[0016] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a vehicle control system provided in an embodiment of the present invention; Figure 2 This is a flowchart illustrating a vehicle control method provided in an embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 In this embodiment, the accelerator pedal B1 is directly connected to the engine control unit (ECU). The ECU obtains the degree of accelerator pedal B1 being depressed (throttle percentage) and sends this data to the driving controller C1. The driving controller C1 calculates and sends the engine speed n back to the ECU, thereby enabling the ECU to control the engine speed. At the same time, the driving controller C1 also controls the shift ratio solenoid valve Y1 and the shift ratio solenoid valve Y2 based on the current gear information and the actual speed.

[0020] like Figure 1 As shown, this embodiment of the invention provides a vehicle control system including an accelerator pedal B1, an engine control unit ECU, a shift switch S1, a shift ratio solenoid valve Y1, and a shift ratio solenoid valve Y2, and also includes a driving controller C1 and an emergency relay K1.

[0021] The engine control unit (ECU) is electrically connected to the accelerator pedal B1 and the driving controller C1 respectively. It reads the depressing angle of the accelerator pedal B1 to calculate the throttle percentage and sends the throttle percentage to the driving controller C1.

[0022] For example, the engine control unit (ECU) calculates the throttle percentage according to the following formula: .

[0023] Where k is the current throttle percentage; a is the current angle at which the throttle pedal B1 is pressed; a1 is the initial position angle of the throttle pedal B1; and a2 is the final position angle of the throttle pedal B1.

[0024] The driving controller C1 is used to calculate the engine speed based on the throttle percentage and send the speed to the engine control unit (ECU) to control the engine speed. It also controls the shift ratio solenoid valves Y1 and Y2 based on the gear position information of the shift switch S1 and the engine speed.

[0025] For example, the driving controller C1 calculates the engine speed according to the following formula: .

[0026] Where n is the engine speed corresponding to the current throttle percentage k; n max n is the engine's maximum speed; min This is the engine's minimum speed.

[0027] Emergency relay K1 is configured as follows: When the driving controller C1 is working normally, the shift switch S1, the reversing ratio solenoid valve Y1 and the shift ratio solenoid valve Y2 are electrically connected to the driving controller C1 so that the driving controller C1 controls the reversing ratio solenoid valve Y1 and the shift ratio solenoid valve Y2 according to the gear position information of the shift switch S1.

[0028] When the driving controller C1 malfunctions, the shift switch S1 is electrically connected to the reversing ratio solenoid valve Y1, and the shift ratio solenoid valve Y2 is disconnected from the shift switch S1. The engine control unit (ECU) is switched to directly control the engine speed based on the depressing angle of the accelerator pedal B1.

[0029] For example, the vehicle control system provided in this embodiment also includes a brake pressure switch S2 and a brake relay K2 electrically connected to the brake pressure switch S3.

[0030] The brake pressure switch S2 is used to control the brake relay K2 to operate when the brake pedal is pressed, thereby disconnecting the shift switch S1 from the shift ratio solenoid valve Y2 and putting the vehicle in neutral.

[0031] For example, the vehicle control system provided in this embodiment also includes an engine speed switch S3 and a speed relay K3; The engine speed switch S3 is used to detect the engine speed and control the speed relay K3 to activate when the engine speed exceeds the preset speed threshold, so as to restore the connection between the shift switch S1 and the reversing ratio solenoid valve Y1.

[0032] The driving controller C1 is also configured to perform a self-test after power-on, and when the self-test is normal, send a throttle control command to the engine control unit (ECU) to start the throttle control, and simultaneously energize the emergency relay K1 coil; when the self-test fails, send a throttle control command to the engine control unit (ECU) to stop the throttle control, and de-energize the emergency relay K1 coil.

[0033] like Figure 1 As shown, the emergency relay K1 has at least two normally open contacts that are synchronously closed or opened. One signal output terminal of the shift switch S1 is electrically connected to the signal receiving terminal of the driving controller C1 through one normally open contact of the emergency relay K1. The signal output terminal of the driving controller C1 is electrically connected to the directional proportional solenoid valve Y1 and the shift proportional solenoid valve Y2 through the other normally open contact of the emergency relay K1. The directional proportional solenoid valve Y1 and the shift proportional solenoid valve Y2 control the travel pump and the travel motor, respectively.

[0034] The other signal output terminal of the shift switch S1 is electrically connected to the normally open contact of the speed relay K3 and the normally closed contact of the brake relay K2 through a normally closed contact of the emergency relay K1; the ends of the normally open contact of the speed relay K3 and the normally closed contact of the brake relay K2 away from the shift switch S1 are electrically connected to the directional proportional solenoid valve Y1 and the shift proportional solenoid valve Y2.

[0035] After powering on, the driving controller C1 performs a self-test. If it functions normally, it sends a throttle control command to the engine control unit (ECU) and simultaneously sends the calculated engine speed n to the ECU. Upon receiving the throttle control command, the ECU controls the engine speed using the received speed n. Simultaneously, the driving controller C1 energizes the coil of the emergency relay K1, causing its normally open contact to close and its normally closed contact to open. This connects the shift switch S1 and the shift ratio solenoid valve Y1 directly to the driving controller C1. The purpose is for the driving controller C1 to receive the signal from the shift switch S1 and, based on the current gear information and engine speed, control the current output of the shift ratio solenoid valve Y2.

[0036] When the driving controller C1 detects a serious fault during its self-test, such as a short circuit or open circuit, it immediately enters emergency mode. It sends a throttle-off control command to the engine control unit (ECU) and simultaneously de-energizes the emergency relay K1 coil, causing the normally closed contact of K1 to close and the normally open contact to open. At this time, the shift switch S1 is hard-wired to the shift ratio solenoid valve Y2 and is no longer connected to the driving controller C1. Furthermore, after receiving the throttle-off control command, the ECU no longer uses the engine speed sent from the driving controller C1 as the speed control value. However, the accelerator pedal B1 remains connected to the ECU, allowing the operator to still control the engine speed. Simultaneously, the operator can also directly control the shift solenoid valve Y2 via the shift switch S1 to shift gears.

[0037] Since the shift switch S1 outputs directly to the directional proportional solenoid valve Y1, the directional proportional solenoid valve Y1 is no longer controlled by the driving controller C1, but instead operates according to the maximum current I. max Simultaneously, the shift ratio solenoid valve Y2 is disconnected from the shift switch S1, causing the travel motor it controls to operate at maximum displacement. Ultimately, the travel motor applies maximum input torque T to the engine. max Depressing the brake pedal causes the brake discs to generate a greater input torque. If the engine is idling at this time... min Its corresponding output torque is the minimum. The combined input torque of the travel motor and the input torque of the brake pedal will eventually cause the engine to stall.

[0038] To prevent engine stalling caused by simultaneously pressing the brake while the engine is idling in emergency mode, the brake pressure switch S2 controls the brake relay K2 coil, while the engine speed switch S3 controls the speed relay K3 coil. When the brake pedal is pressed, the brake pressure switch S2 energizes the brake relay K2 coil, opening the normally closed contact of the brake relay K2. At this time, the shift switch S1 is disconnected from the shift ratio solenoid valve Y1, and the current applied to the shift ratio solenoid valve Y1 is zero, causing the drive system to return to neutral, thus ceasing to generate torque and preventing engine stalling. When the accelerator pedal B1 is pressed, the engine speed switch S3 detects that the engine speed exceeds the set value n. set When the corresponding engine output torque is greater than the external input torque, the engine will not shut off. At this time, the coil of the engine speed relay K3 is energized, causing the normally open contact of the engine speed relay K3 to close, and the shift switch S1 resumes its connection with the shift ratio solenoid valve Y2.

[0039] In summary, this embodiment provides a vehicle control system that achieves engine speed control with minimal changes, without altering the original component connection methods, wiring harnesses, or engine ECU internal programs. This prevents sudden speed changes during vehicle start-up and gear shifting, improving vehicle stability and comfort. Furthermore, in the event of a malfunction in the driving controller, it can control both engine speed and temporarily control gear shifting, while also preventing engine stalling caused by idling and braking in emergency mode.

[0040] Example 2 like Figure 2 As shown, this embodiment provides a vehicle control method based on the vehicle control system described in Embodiment 1, including: Step 101: Obtain the accelerator pedal depress angle to calculate the throttle percentage.

[0041] Step 102: Calculate the engine speed based on the throttle percentage.

[0042] Step 103: When the driving controller is working normally, connect the shift switch to the driving controller so that the driving controller controls the reversing ratio solenoid valve and the shift ratio solenoid valve according to the gear position information of the shift switch and the engine speed.

[0043] Step 104: In the event of a malfunction in the driving controller, the shift switch is directly electrically connected to the reversing ratio solenoid valve via the emergency relay, and the reversing ratio solenoid valve is disconnected from the shift switch. The engine control unit is then switched to directly control the engine speed based on the angle at which the accelerator pedal is depressed.

[0044] The vehicle control method provided in this embodiment avoids sudden changes in vehicle speed during start-up and gear shifting, improving vehicle stability and comfort. Furthermore, when the driving controller malfunctions, it can control engine speed and temporarily control gear shifting, while also preventing engine stalling caused by idling and braking in emergency mode.

[0045] Example 3 This embodiment provides a computer device, including a processor and a memory; wherein, when the processor executes a computer program stored in the memory, it implements the steps of the vehicle control method described in Embodiment 2.

[0046] For a more detailed explanation of the above method, please refer to the relevant content disclosed in Example 2, which will not be repeated here.

[0047] Example 4 This embodiment provides a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, it implements the steps of the vehicle control method described in Embodiment 2.

[0048] For a more detailed explanation of the above method, please refer to the relevant content disclosed in Example 2, which will not be repeated here.

[0049] Example 5 This embodiment provides a computer program product, including computer-executable instructions or a computer program. When the computer-executable instructions or the computer program are executed by a processor, they implement the steps of the vehicle control method described in Embodiment 2.

[0050] For a more detailed explanation of the above method, please refer to the relevant content disclosed in Example 2, which will not be repeated here.

[0051] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the devices, storage media, and computer program products disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and relevant details can be found in the method section.

[0052] Those skilled in the art will clearly understand that the techniques in the embodiments of the present invention can be implemented using software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solutions in the embodiments of the present invention, or the parts that contribute to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or certain parts of the embodiments of the present invention.

[0053] In some embodiments, computer-executable instructions may take the form of programs, software, software modules, scripts, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as stand-alone programs or as modules, components, subroutines, or other units suitable for use in a computing environment.

[0054] As an example, computer-executable instructions may, but do not necessarily, correspond to files in a file system. They may be stored as part of a file that holds other programs or data, for example, in one or more scripts in a Hyper Text Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple co-located files (e.g., files that store one or more modules, subroutines, or code sections).

[0055] As an example, computer-executable instructions can be deployed to execute on a single electronic device, or on multiple electronic devices located at one location, or on multiple electronic devices distributed across multiple locations and interconnected via a communication network.

[0056] The present invention has been described in detail above with reference to specific embodiments and exemplary examples; however, these descriptions should not be construed as limiting the present invention. Those skilled in the art will understand that various equivalent substitutions, modifications, or improvements can be made to the technical solutions and embodiments of the present invention without departing from the spirit and scope of the invention, and all such modifications and improvements fall within the scope of the present invention. The scope of protection of the present invention is defined by the appended claims.

Claims

1. A vehicle control system, comprising an accelerator pedal, an engine control unit, a shift switch, a reversing ratio solenoid valve, and a shift ratio solenoid valve, characterized in that, It also includes a driving controller and an emergency relay; The engine control unit is electrically connected to the accelerator pedal and the driving controller respectively, and is used to read the accelerator pedal depressing angle to calculate the throttle percentage, and send the throttle percentage to the driving controller; The driving controller is used to calculate the engine speed based on the throttle percentage and send the speed to the engine control unit to control the engine speed, and to control the reversing ratio solenoid valve and the shift ratio solenoid valve based on the gear position information of the shift switch and the engine speed. The emergency relay is configured as follows: When the driving controller is working normally, the shift switch, the reversing ratio solenoid valve and the shift ratio solenoid valve are electrically connected to the driving controller so that the driving controller controls the reversing ratio solenoid valve and the shift ratio solenoid valve according to the gear position information of the shift switch. When the driving controller malfunctions, the shift switch is electrically connected to the reversing ratio solenoid valve, and the shift ratio solenoid valve is disconnected from the shift switch. The engine control unit is then switched to directly control the engine speed based on the accelerator pedal depressing angle.

2. The vehicle control system according to claim 1, characterized in that, It also includes a brake pressure switch and a brake relay electrically connected to the brake pressure switch; The brake pressure switch is used to control the brake relay to operate when the brake pedal is pressed, thereby disconnecting the shift switch from the shift ratio solenoid valve and putting the vehicle in neutral.

3. The vehicle control system according to claim 1, characterized in that, It also includes an engine speed switch and a speed relay; The engine speed switch is used to detect the engine speed and control the speed relay to operate when the engine speed exceeds a preset speed threshold, so as to restore the connection between the shift switch and the reversing ratio solenoid valve.

4. The vehicle control system according to claim 1, characterized in that, The driving controller is also configured to perform a self-test after power-on, and when the self-test is normal, send a throttle control command to the engine control unit and simultaneously energize the emergency relay coil; when the self-test fails, send a throttle control command to the engine control unit and de-energize the emergency relay coil.

5. The vehicle control system according to claim 1, characterized in that, The engine control unit calculates the throttle percentage according to the following formula: ； Where k is the current throttle percentage; a is the current angle at which the throttle pedal is pressed; a1 is the initial position angle of the throttle pedal; and a2 is the final position angle of the throttle pedal.

6. The vehicle control system according to claim 1, characterized in that, The driving controller calculates the engine speed according to the following formula: ； Where n is the engine speed corresponding to the current throttle percentage k; n max n is the engine's maximum speed; min This is the engine's minimum speed.

7. A vehicle control method based on the vehicle control system according to any one of claims 1-6, characterized in that, include: Obtain the accelerator pedal depress angle to calculate the throttle percentage; Calculate engine speed based on throttle percentage; When the driving controller is working normally, the shift switch is electrically connected to the driving controller so that the driving controller controls the reversing ratio solenoid valve and the shift ratio solenoid valve according to the gear position information of the shift switch and the engine speed. In the event of a malfunction in the driving controller, the shift switch is directly electrically connected to the reversing ratio solenoid valve via an emergency relay, and the reversing ratio solenoid valve is disconnected from the shift switch. Additionally, the engine control unit is switched to directly control the engine speed based on the accelerator pedal depressing angle.

8. A computer device, characterized in that, It includes a processor and a memory; wherein, when the processor executes the computer program stored in the memory, it implements the steps of the vehicle control method of claim 7.

9. A computer-readable storage medium, characterized in that, Used to store computer programs; when the computer programs are executed by a processor, they implement the steps of the vehicle control method of claim 7.

10. A computer program product, characterized in that, It includes computer-executable instructions or computer programs, which, when executed by a processor, implement the steps of the vehicle control method of claim 7.

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