On-off hydraulic retarder control method, device and computer equipment

Abstract

This invention relates to a control method, device, and computer equipment for an on / off hydraulic retarder. The on / off hydraulic retarder control unit analyzes and judges gradient signals, accelerator pedal signals, brake pedal signals, and vehicle speed signals to identify the operating mode. Once the control unit identifies a suitable operating condition, it determines that the on / off hydraulic retarder will be used. The control unit pre-controls the engagement of the on / off shifting actuator, ensuring power input to the on / off hydraulic retarder. When the driver opens the on / off hydraulic retarder control lever, the retarder quickly engages to generate braking force, ensuring a fast braking response time. By predicting the retarder's usage scenario and engaging the on / off mechanism accordingly, the control unit shortens the retarder's response time.

Description

Technical Field

[0001] This application relates to the field of hydraulic retarder technology, and in particular to a control method, apparatus and computer equipment for an on / off type hydraulic retarder. Background Technology

[0002] Hydraulic retarders are increasingly being used in heavy-duty commercial vehicles in China, becoming standard equipment in mountainous regions of Yunnan and Guizhou. The working principle of a hydraulic retarder is that the rotation of the rotor drives the rotation of the liquid medium inside the working chamber. The rotating liquid reacts through the stator to the rotor, generating a reverse braking force. This braking force is ultimately transferred to the wheels via the rotating shaft, causing deceleration. However, in traditional hydraulic retarders, because the rotor is constantly rotating when not in operation, the presence of air in the working chamber, despite the absence of liquid medium, still results in a small amount of no-load loss, leading to increased fuel consumption.

[0003] With the development of hydraulic retarder technology, on-off hydraulic retarder technology has emerged. The on-off hydraulic retarder has the same connection position as the traditional hydraulic retarder, which is connected to the rear end of the transmission. The gear on the transmission output shaft and the gear on the hydraulic retarder input shaft adopt a constant mesh structure, but no power is input to the hydraulic retarder by default.

[0004] In traditional technology, when a hydraulic retarder needs to work, the retarder control unit controls the cylinder to engage with the solenoid valve to intake air. The cylinder pushes the shift fork to engage the synchronizer. Only when the synchronizer is engaged does the retarder have input power.

[0005] However, the current drawback of this approach is that it increases the response time of the retarder. To make the retarder work, the cylinder must first be controlled to engage the synchronizer, and the synchronizer engagement takes a certain amount of time. Only after the synchronizer engages and power is input can the retarder work to generate braking force. Summary of the Invention

[0006] Based on this, it is necessary to provide a control method, device, and computer equipment for a switch-on hydraulic retarder that can predict the retarder's usage scenario through the switch-off hydraulic retarder control unit, combine the switch-off mechanism to enable the retarder to have input power, and shorten the response time of the switch-on hydraulic retarder.

[0007] Firstly, this application provides a control method for an on / off type hydraulic retarder, the control method comprising the following steps:

[0008] The on / off hydraulic retarder control unit analyzes and judges the gradient signal, accelerator pedal signal, brake pedal signal and vehicle speed signal to identify the working mode.

[0009] The on / off hydraulic retarder control unit identifies the appropriate operating conditions and determines that the on / off hydraulic retarder will be used. The on / off hydraulic retarder control unit controls the on / off shifting actuator to engage in advance, so that the on / off hydraulic retarder has power input.

[0010] When the driver opens the on / off hydraulic retarder control handle, the on / off hydraulic retarder can quickly work to generate braking force, ensuring the braking force response time of the on / off hydraulic retarder.

[0011] The on / off hydraulic retarder control unit acquires vehicle brake pedal signals, accelerator pedal signals, gradient signals, and vehicle speed signals via the CAN bus, and the on / off hydraulic retarder acquires handle switch signals.

[0012] When the on / off hydraulic retarder handle switch signal is in the off state, the on / off hydraulic retarder control mode is activated; when the on / off hydraulic retarder handle switch signal is in the on state, the on / off hydraulic retarder control mode is deactivated.

[0013] The on / off hydraulic retarder control unit judges the collected slope signal. When the slope signal is greater than 2% and the duration is greater than 3 seconds, the on / off hydraulic retarder control unit judges the current working condition as a qualified working condition. The on / off hydraulic retarder control unit determines that the vehicle is currently on a long downhill section and prepares to activate the on / off hydraulic retarder.

[0014] The on / off hydraulic retarder control unit controls the cylinder to engage with the solenoid valve, which in turn drives the shift fork to mesh the input gear of the on / off hydraulic retarder with the output gear of the transmission, thus engaging the input power of the on / off hydraulic retarder.

[0015] During this process, the on / off hydraulic retarder handle signal is activated, and the on / off hydraulic retarder control unit controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force.

[0016] The on / off hydraulic retarder control unit judges the collected slope signal. When the slope is ≤0% and the duration is >2s, and the on / off hydraulic retarder handle signal is in the closed state, the on / off hydraulic retarder control unit judges the current working condition as an unsuitable working condition.

[0017] The on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, controlling the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, thus interrupting the input power of the on / off hydraulic retarder.

[0018] The on / off hydraulic retarder control unit judges the collected accelerator pedal signal. When the accelerator pedal opening signal = 0 and the duration is > 2s, the on / off hydraulic retarder control unit judges the current working condition as a qualified working condition.

[0019] The on / off hydraulic retarder control unit controls the cylinder to engage with the solenoid valve, which in turn drives the shift fork to mesh the input gear of the on / off hydraulic retarder with the output gear of the transmission, thus engaging the input power of the on / off hydraulic retarder.

[0020] During this process, the on / off hydraulic retarder handle signal is activated, and the on / off hydraulic retarder control unit controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force.

[0021] The on / off hydraulic retarder control unit judges the collected throttle pedal signal. When the throttle opening is not equal to 0 and the on / off hydraulic retarder handle signal is in the closed state, the on / off hydraulic retarder control unit judges the current working condition as an unsuitable working condition.

[0022] The on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, controlling the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, thus interrupting the input power of the on / off hydraulic retarder.

[0023] The on / off hydraulic retarder control unit judges the collected brake pedal signal. When the brake pedal opening signal = 1, the on / off hydraulic retarder control unit judges the current working condition as a qualified working condition.

[0024] The on / off hydraulic retarder control unit controls the cylinder to engage with the solenoid valve, which in turn drives the shift fork to mesh the input gear of the on / off hydraulic retarder with the output gear of the transmission, thus engaging the input power of the on / off hydraulic retarder.

[0025] When the input gear of the on / off hydraulic retarder meshes with the output gear of the transmission, the on / off hydraulic retarder control unit immediately controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force to assist the main brake and decelerate the vehicle.

[0026] Until the brake pedal opening signal = 0, the on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, controlling the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, interrupting power, and at the same time closing the proportional valve to stop the on / off hydraulic retarder from working.

[0027] Secondly, this application also provides an on / off type hydraulic retarder control device, the device comprising:

[0028] transmission;

[0029] The on / off hydraulic retarder is connected to the rear end of the transmission. The gears on the transmission output shaft and the gears on the on / off hydraulic retarder input shaft are in constant mesh. By default, no power is input to the on / off hydraulic retarder.

[0030] The on / off hydraulic retarder control unit is used to acquire and analyze gradient signals, accelerator pedal signals, brake pedal signals, and vehicle speed signals, identify operating conditions, and pre-determine whether the on / off hydraulic retarder should be used for the corresponding operating conditions.

[0031] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0032] The on / off hydraulic retarder control unit analyzes and judges the gradient signal, accelerator pedal signal, brake pedal signal and vehicle speed signal to identify the working mode.

[0033] The on / off hydraulic retarder control unit identifies the appropriate operating conditions and determines that the on / off hydraulic retarder will be used. The on / off hydraulic retarder control unit controls the on / off shifting actuator to engage in advance, so that the on / off hydraulic retarder has power input.

[0034] When the driver opens the on / off hydraulic retarder control handle, the on / off hydraulic retarder can quickly work to generate braking force, ensuring the braking force response time of the on / off hydraulic retarder.

[0035] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0036] The on / off hydraulic retarder control unit analyzes and judges the gradient signal, accelerator pedal signal, brake pedal signal and vehicle speed signal to identify the working mode.

[0037] The on / off hydraulic retarder control unit identifies the appropriate operating conditions and determines that the on / off hydraulic retarder will be used. The on / off hydraulic retarder control unit controls the on / off shifting actuator to engage in advance, so that the on / off hydraulic retarder has power input.

[0038] When the driver opens the on / off hydraulic retarder control handle, the on / off hydraulic retarder can quickly work to generate braking force, ensuring the braking force response time of the on / off hydraulic retarder.

[0039] The aforementioned on / off hydraulic retarder control method, device, computer equipment, storage medium, and computer program product analyze and judge the gradient signal, accelerator pedal signal, brake pedal signal, and vehicle speed signal through the on / off hydraulic retarder control unit. It performs working condition mode identification, pre-judges the working conditions that meet the criteria, and controls the on / off shifting actuator to engage in advance, so that the on / off hydraulic retarder has power input. When the driver opens the on / off hydraulic retarder control handle, the on / off hydraulic retarder can quickly work to generate braking force, ensuring the braking force response time of the on / off hydraulic retarder. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a control flowchart of an on / off hydraulic retarder control method in one embodiment;

[0042] Figure 2 This is a simplified structural diagram of an on / off hydraulic retarder control method in one embodiment;

[0043] Figure 3 This is an electrical system connection diagram of an on / off hydraulic retarder control method in one embodiment. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0045] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0046] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0050] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0051] In one embodiment, the present invention provides a control method for an on / off hydraulic retarder, such as... Figure 1 and Figure 2 As shown, the control method includes the following steps:

[0052] By analyzing and judging the gradient signal, accelerator pedal signal, brake pedal signal and vehicle speed signal, the working condition mode is identified, and the on-off hydraulic retarder is pre-judged for the working condition that meets the criteria.

[0053] The on / off hydraulic retarder control unit acquires vehicle brake pedal signals, accelerator pedal signals, gradient signals, and vehicle speed signals via the CAN bus, while the on / off hydraulic retarder acquires handle switch signals.

[0054] When the on / off hydraulic retarder handle switch signal is in the off state, the on / off hydraulic retarder control mode is activated; if the on / off hydraulic retarder handle switch signal is in the on state, this function is deactivated.

[0055] The on / off hydraulic retarder control unit judges the collected slope signal. When the slope signal is greater than 2% and the duration is greater than 3 seconds, the on / off hydraulic retarder control unit determines that the vehicle is currently on a long downhill section and is about to activate the on / off hydraulic retarder.

[0056] like Figure 3 The diagram shows the electrical system connection of the on / off hydraulic retarder control method. The on / off hydraulic retarder control unit controls the cylinder to connect the solenoid valve, and the control cylinder drives the shift fork to mesh with the gear output of the transmission, so that the on / off hydraulic retarder input power is engaged.

[0057] If the on / off hydraulic retarder handle signal is not activated during this process, the input gear of the on / off hydraulic retarder will remain engaged with the output gear of the transmission, and the input power of the on / off hydraulic retarder will be in an engaged state.

[0058] If the on / off hydraulic retarder handle signal is activated during this process, the on / off hydraulic retarder control unit controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force.

[0059] The on / off hydraulic retarder control unit judges the collected slope signal. When the slope does not meet the requirement of ≤0% and the duration is >2s, it continuously monitors whether the on / off hydraulic retarder handle signal is activated.

[0060] The on / off hydraulic retarder control unit judges the collected slope signal. When the slope is ≤0% and the duration is >2s, and the on / off hydraulic retarder handle signal is in the closed state, the on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, controls the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, and the input power of the on / off hydraulic retarder is interrupted.

[0061] The on / off hydraulic retarder control unit judges the collected accelerator pedal signal. When the accelerator pedal opening signal is 0 (i.e., the accelerator pedal is released) and the duration is >2s, the on / off hydraulic retarder control unit judges that the driver's driving intention may be to use the on / off hydraulic retarder auxiliary braking. Therefore, the on / off hydraulic retarder control unit controls the cylinder to engage the solenoid valve, and controls the cylinder to drive the shift fork to engage the input gear of the on / off hydraulic retarder with the output gear of the transmission. The input power of the on / off hydraulic retarder is in the engaged state.

[0062] If the on / off hydraulic retarder handle signal is not activated during this process, the input gear of the on / off hydraulic retarder will remain engaged with the output gear of the transmission, and the input power of the on / off hydraulic retarder will be in an engaged state.

[0063] If the on / off hydraulic retarder handle signal is activated during this process, the on / off hydraulic retarder control unit controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force.

[0064] When the throttle opening is 0, continuously monitor whether the on / off hydraulic retarder handle signal is activated.

[0065] When the throttle opening is not equal to 0 and the on / off hydraulic retarder handle signal is in the closed state, the on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, controls the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, and the input power of the on / off hydraulic retarder is interrupted.

[0066] When the brake pedal opening signal = 1 (i.e., the brake pedal is pressed), the on-off hydraulic retarder control unit controls the cylinder to engage the solenoid valve, and controls the cylinder to drive the shift fork to mesh the input gear of the on-off hydraulic retarder with the output gear of the transmission, so that the input power of the on-off hydraulic retarder is engaged.

[0067] When the input gear of the on / off hydraulic retarder meshes with the output gear of the transmission, the on / off hydraulic retarder control unit immediately controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force to assist the main brake and decelerate the vehicle.

[0068] Until the brake pedal opening signal = 0 (i.e., the brake pedal is released), the on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, controlling the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, interrupting power, and at the same time closing the proportional valve to stop the on / off hydraulic retarder from working.

[0069] The prerequisite for judging and acting according to the above conditions is that the vehicle speed is greater than 15 km / h. If the vehicle speed is less than or equal to 15 km / h, the on / off hydraulic retarder will block all actions and stop working.

[0070] By analyzing and judging the gradient signal, accelerator pedal signal, brake pedal signal and vehicle speed signal, the working condition mode is identified, and the on-off hydraulic retarder is pre-judged for the working condition that meets the criteria.

[0071] The on / off hydraulic retarder is connected to the rear end of the transmission. The gears on the transmission output shaft and the gears on the on / off hydraulic retarder input shaft are in constant mesh, but by default, no power is input to the on / off hydraulic retarder. When the on / off hydraulic retarder needs to work, the on / off hydraulic retarder control unit controls the cylinder to engage with the solenoid valve for air intake. The cylinder pushes the shift fork to engage the synchronizer. Only after the synchronizer is engaged does the on / off hydraulic retarder receive input power.

[0072] This allows for advance control of the on / off shifting actuator to engage, ensuring power input to the on / off hydraulic retarder. When the driver opens the on / off hydraulic retarder control handle, the on / off hydraulic retarder can quickly work to generate braking force, guaranteeing the braking force response time of the on / off hydraulic retarder.

[0073] In one embodiment, a switch-on / off hydraulic retarder control device includes:

[0074] transmission;

[0075] The on / off hydraulic retarder is connected to the rear end of the transmission. The gears on the transmission output shaft and the gears on the on / off hydraulic retarder input shaft are in constant mesh. By default, no power is input to the on / off hydraulic retarder.

[0076] The on / off hydraulic retarder control unit is used to acquire and analyze gradient signals, accelerator pedal signals, brake pedal signals, and vehicle speed signals, identify operating conditions, and pre-determine whether the on / off hydraulic retarder should be used for the corresponding operating conditions.

[0077] In one embodiment, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0078] The on / off hydraulic retarder control unit analyzes and judges the gradient signal, accelerator pedal signal, brake pedal signal and vehicle speed signal to identify the working mode.

[0079] The on / off hydraulic retarder control unit identifies the appropriate operating conditions and determines that the on / off hydraulic retarder will be used. The on / off hydraulic retarder control unit controls the on / off shifting actuator to engage in advance, so that the on / off hydraulic retarder has power input.

[0080] When the driver opens the on / off hydraulic retarder control handle, the on / off hydraulic retarder can quickly work to generate braking force, ensuring the braking force response time of the on / off hydraulic retarder.

[0081] In one embodiment, the processor may further perform the following steps when executing the computer program:

[0082] The on / off hydraulic retarder control unit acquires vehicle brake pedal signals, accelerator pedal signals, gradient signals, and vehicle speed signals via the CAN bus, while the on / off hydraulic retarder acquires handle switch signals.

[0083] When the on / off hydraulic retarder handle switch signal is in the off state, the on / off hydraulic retarder control mode is activated; when the on / off hydraulic retarder handle switch signal is in the on state, the on / off hydraulic retarder control mode is deactivated.

[0084] In one embodiment, the processor may further perform the following steps when executing the computer program:

[0085] The on / off hydraulic retarder control unit judges the collected slope signal. When the slope signal is greater than 2% and the duration is greater than 3 seconds, the on / off hydraulic retarder control unit judges the current working condition as a qualified working condition. The on / off hydraulic retarder control unit determines that the vehicle is currently on a long downhill section and prepares to activate the on / off hydraulic retarder.

[0086] The on / off hydraulic retarder control unit controls the cylinder to engage with the solenoid valve, which in turn drives the shift fork to mesh the input gear of the on / off hydraulic retarder with the output gear of the transmission, thus engaging the input power of the on / off hydraulic retarder.

[0087] During this process, the on / off hydraulic retarder handle signal is activated, and the on / off hydraulic retarder control unit controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force.

[0088] In one embodiment, the processor may further perform the following steps when executing the computer program:

[0089] The on / off hydraulic retarder control unit judges the collected slope signal. When the slope is ≤0% and the duration is >2s, and the on / off hydraulic retarder handle signal is in the closed state, the on / off hydraulic retarder control unit judges the current working condition as an unsuitable working condition.

[0090] The on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, controlling the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, thus interrupting the input power of the on / off hydraulic retarder.

[0091] In one embodiment, the processor may further perform the following steps when executing the computer program:

[0092] The on / off hydraulic retarder control unit judges the collected accelerator pedal signal. When the accelerator pedal opening signal = 0 and the duration is > 2s, the on / off hydraulic retarder control unit judges the current working condition as a qualified working condition.

[0093] The on / off hydraulic retarder control unit controls the cylinder to engage with the solenoid valve, which in turn drives the shift fork to mesh the input gear of the on / off hydraulic retarder with the output gear of the transmission, thus engaging the input power of the on / off hydraulic retarder.

[0094] During this process, the on / off hydraulic retarder handle signal is activated, and the on / off hydraulic retarder control unit controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force.

[0095] In one embodiment, the processor may further perform the following steps when executing the computer program:

[0096] The on / off hydraulic retarder control unit judges the collected throttle pedal signal. When the throttle opening is not equal to 0 and the on / off hydraulic retarder handle signal is in the closed state, the on / off hydraulic retarder control unit judges the current working condition as an unsuitable working condition.

[0097] The on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, controlling the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, thus interrupting the input power of the on / off hydraulic retarder.

[0098] In one embodiment, the processor may further perform the following steps when executing the computer program:

[0099] The on / off hydraulic retarder control unit judges the collected brake pedal signal. When the brake pedal opening signal = 1, the on / off hydraulic retarder control unit judges the current working condition as a qualified working condition.

[0100] The on / off hydraulic retarder control unit controls the cylinder to engage with the solenoid valve, which in turn drives the shift fork to mesh the input gear of the on / off hydraulic retarder with the output gear of the transmission, thus engaging the input power of the on / off hydraulic retarder.

[0101] When the input gear of the on / off hydraulic retarder meshes with the output gear of the transmission, the on / off hydraulic retarder control unit immediately controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force to assist the main brake and decelerate the vehicle.

[0102] Until the brake pedal opening signal = 0, the on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, controlling the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, interrupting power, and at the same time closing the proportional valve to stop the on / off hydraulic retarder from working.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A control method for an on / off hydraulic retarder, characterized in that, The control method includes the following steps: The on / off hydraulic retarder control unit analyzes and judges the gradient signal, accelerator pedal signal, brake pedal signal and vehicle speed signal to identify the working mode. The on / off hydraulic retarder control unit identifies the corresponding operating conditions and determines that the on / off hydraulic retarder should be used. The on / off hydraulic retarder control unit controls the on / off shifting actuator to engage in advance, so that the on / off hydraulic retarder has power input; When the driver opens the on / off hydraulic retarder control handle, the on / off hydraulic retarder can work quickly to generate braking force, ensuring the braking force response time of the on / off hydraulic retarder. The on / off hydraulic retarder control unit acquires vehicle brake pedal signals, accelerator pedal signals, gradient signals, and vehicle speed signals via the CAN bus, and the on / off hydraulic retarder acquires handle switch signals. When the on / off hydraulic retarder handle switch signal is in the off state, the on / off hydraulic retarder control mode is activated; when the on / off hydraulic retarder handle switch signal is in the on state, the on / off hydraulic retarder control mode is deactivated. The on / off hydraulic retarder control unit judges the collected slope signal. When the slope signal is greater than 2% and the duration is greater than 3 seconds, the on / off hydraulic retarder control unit judges the current working condition as a qualified working condition. The on / off hydraulic retarder control unit determines that the vehicle is currently on a long downhill section and prepares to activate the on / off hydraulic retarder. The on / off hydraulic retarder control unit controls the cylinder to engage with the solenoid valve, which in turn drives the shift fork to mesh the input gear of the on / off hydraulic retarder with the output gear of the transmission, thus engaging the input power of the on / off hydraulic retarder. During this process, the on / off hydraulic retarder handle signal is activated, and the on / off hydraulic retarder control unit controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force. The on / off hydraulic retarder control unit judges the collected slope signal. When the slope is ≤0% and the duration is >2s, and the on / off hydraulic retarder handle signal is in the closed state, the on / off hydraulic retarder control unit judges the current working condition as an unsuitable working condition. The on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, controlling the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, thus interrupting the input power of the on / off hydraulic retarder. The on / off hydraulic retarder control unit judges the collected accelerator pedal signal. When the accelerator pedal opening signal = 0 and the duration is > 2s, the on / off hydraulic retarder control unit judges the current working condition as a qualified working condition. The on / off hydraulic retarder control unit controls the cylinder to engage with the solenoid valve, which in turn drives the shift fork to mesh the input gear of the on / off hydraulic retarder with the output gear of the transmission, thus engaging the input power of the on / off hydraulic retarder. During this process, the on / off hydraulic retarder handle signal is activated, and the on / off hydraulic retarder control unit controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force. The on / off hydraulic retarder control unit judges the collected throttle pedal signal. When the throttle opening is not equal to 0 and the on / off hydraulic retarder handle signal is in the closed state, the on / off hydraulic retarder control unit judges the current working condition as an unsuitable working condition. The on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, and controls the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, thus interrupting the input power of the on / off hydraulic retarder. The on / off hydraulic retarder control unit judges the collected brake pedal signal. When the brake pedal opening signal = 1, the on / off hydraulic retarder control unit judges the current working condition as a qualified working condition. The on / off hydraulic retarder control unit controls the cylinder to engage with the solenoid valve, which in turn drives the shift fork to mesh the input gear of the on / off hydraulic retarder with the output gear of the transmission, thus engaging the input power of the on / off hydraulic retarder. When the input gear of the on / off hydraulic retarder meshes with the output gear of the transmission, the on / off hydraulic retarder control unit immediately controls the proportional valve to intake air, and the on / off hydraulic retarder assembly immediately starts to work to generate braking force to assist the main brake and decelerate the vehicle. Until the brake pedal opening signal = 0, the on / off hydraulic retarder control unit controls the cylinder separation solenoid valve to open, controlling the cylinder to drive the shift fork to disengage the input gear of the on / off hydraulic retarder from the output gear of the transmission, interrupting power, and at the same time closing the proportional valve to stop the on / off hydraulic retarder from working.

2. A control device for an on / off type hydraulic retarder, characterized in that, The control method for the on / off hydraulic retarder according to claim 1, the device comprising: transmission; The on / off hydraulic retarder is connected to the rear end of the transmission. The gears on the transmission output shaft and the gears on the on / off hydraulic retarder input shaft are in constant mesh. By default, no power is input to the on / off hydraulic retarder. The on / off hydraulic retarder control unit is used to acquire and analyze gradient signals, accelerator pedal signals, brake pedal signals, and vehicle speed signals, identify operating conditions, and pre-determine whether the on / off hydraulic retarder should be used for the corresponding operating conditions.

3. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method of claim 1.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method of claim 1.

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