Rotating speed matching guide system and method of synchronizer-free mechanical transmission

Abstract

The invention relates to the field of vehicle transmission control, in particular to a rotating speed matching guide system and method of a synchronizer-free mechanical transmission, which comprises a signal sensing module, a rotating speed matching calculation module and an interactive guide module, and the interactive guide module is connected with the rotating speed matching calculation module and is used for carrying out gear switching according to data guide, so that the fundamental operation problem of'incapability of entering a gear 'or'tooth beating' caused by mismatching of rotating speeds of a synchronizer-free transmission at the present stage is solved.

Description

Technical Field

[0001] This invention relates to the field of vehicle transmission control, and more specifically to a speed matching guidance system and method for a synchronizerless mechanical transmission. Background Technology

[0002] The existing transmission technologies for commercial vehicles are mainly divided into two routes: synchronizers and non-synchronizers (meshing sleeves). Although synchronizers are easy to operate, they have inherent disadvantages such as high manufacturing costs, easy damage, and low reliability. Although non-synchronizers are low in cost and have a robust and reliable structure, their shifting operation relies entirely on the driver's experience and skills. They achieve speed matching through the "double-clutching" method, which has a series of problems such as extremely difficult operation, easy to cause gear grinding during shifting, and premature gear wear.

[0003] The patent documents with application number "CN202110707533.3" and patent name "A vehicle shift reminder method and device" and application number "CN201911408598.7" and patent name "An advanced commercial vehicle shift reminder control method and system" both propose technical starting points based on the assumption that the shift operation can be completed smoothly, and optimize the shift timing to improve fuel economy or power. Neither of them addresses or can solve the fundamental operational problem of "inability to shift gears" or "gear grinding" caused by speed mismatch in non-synchronous transmissions.

[0004] In summary, a speed matching guidance system and method for a synchronizerless mechanical transmission is proposed to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide a speed matching guidance system and method for a synchronizerless mechanical transmission, which guides the driver to complete shock-free gear shifts by calculating and visually displaying the speed matching range in real time.

[0006] A speed matching guidance system for a synchronizerless mechanical transmission includes a signal sensing module, a speed matching calculation module, and an interactive guidance module. The signal sensing module collects signals and is connected to the speed matching calculation module. The interactive guidance module is connected to the speed matching calculation module and guides gear switching based on the data.

[0007] Further specifying, the signal sensing module includes a clutch pedal high-position switch, an engine speed sensor, and an output shaft speed sensor. The clutch pedal high-position switch collects the clutch pedal status signal, the engine speed sensor collects the real-time engine speed n_ice, and the output shaft speed sensor collects the transmission output shaft speed n_out.

[0008] Further specifying, the speed matching calculation module is a central processing unit (ECU), which calculates the ideal engine speed n_req required for each forward gear and the engine speed range that can be entered without impact for each gear.

[0009] Further specifying, the interactive guidance module includes upshift and downshift indicator lights and a speed range that can be entered without impact. The speed range that can be entered without impact is dynamically displayed on the engine's tachometer. The speed range that can be entered without impact changes in real time with changes in vehicle speed. The upshift and downshift indicator lights are located outside the speed range that can be entered without impact.

[0010] A method for a speed matching guidance system for a synchronizerless mechanical transmission, comprising the following specific steps:

[0011] Step S1: Determine if the clutch is depressed. If not, continue monitoring. If yes, proceed to step S2.

[0012] Step S2: Disengage the gear, release the clutch pedal, and the signal acquisition module acquires the clutch pedal status signal, the real-time engine speed n_ice, and the transmission output shaft speed n_out;

[0013] Step S3: The ECU calculates the ideal engine speed n_req required to engage each forward gear;

[0014] Step S4: Based on the preset allowable speed difference threshold [Δ_min, Δ_max], calculate the engine speed range [n_req+Δ_min, n_req+Δ_max] that can be entered without impact for each gear.

[0015] Step S5: Send each gear range to the instrument panel;

[0016] Step S6: Determine if the speed gear is appropriate. If it is appropriate, proceed to step S8; otherwise, proceed to step S7.

[0017] Step S7: Calculate the speed range of adjacent gears, send upshift or downshift guidance signal, and illuminate upshift or downshift indicator light. The driver controls the accelerator pedal according to the guidance of the indicator light.

[0018] Step S8: Highlight the available gear and RPM range;

[0019] Step S9: Engage the target gear.

[0020] The advantages of this invention compared to the prior art are as follows:

[0021] The system calculates and displays in real time the engine speed range required for shock-free gear shifting through the interaction of various modules, and actively guides the driver to adjust the speed to this range, thereby fundamentally solving the problem of gear grinding during shifting, reducing the difficulty of operation, and extending the life of the transmission system. Attached Figure Description

[0022] Figure 1 This is the logic control flowchart of the present invention;

[0023] Figure 2 This is a schematic diagram of the dashboard interface of the present invention. Figure 1 ;

[0024] Figure 3 This is a schematic diagram of the dashboard interface of the present invention. Figure 2 . Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] Example:

[0027] like Figures 1-3 As shown, a speed matching guidance system for a synchronizerless mechanical transmission includes a signal sensing module, a speed matching calculation module, and an interactive guidance module. The signal sensing module collects signals and is connected to the speed matching calculation module. The interactive guidance module is connected to the speed matching calculation module and guides gear switching based on the data.

[0028] The signal sensing module includes a clutch pedal high-position switch, an engine speed sensor, and an output shaft speed sensor. The clutch pedal high-position switch collects the clutch pedal status signal, the engine speed sensor collects the real-time engine speed n_ice, and the output shaft speed sensor collects the transmission output shaft speed n_out.

[0029] The speed matching calculation module is a central processing unit (ECU) used to respond to the signal that the clutch pedal is depressed, start the speed matching guidance process, and calculate the ideal engine speed n_req required to enter each forward gear based on the transmission output shaft speed n_out and the pre-stored gear ratios i.

[0030] The interactive guidance module includes upshift and downshift indicator lights and at least one speed range that can be entered without impact. The ECU has a preset allowable speed difference threshold [Δ_min, Δ_max]. Based on the allowable speed difference threshold, the speed range that can be entered without impact is calculated as [n_req+Δ_min, n_req+Δ_max]. The speed range that can be entered without impact is dynamically displayed on the engine tachometer. The speed range that can be entered without impact changes in real time with the vehicle speed. The upshift and downshift indicator lights are located outside the speed range that can be entered without impact. The speed range that can be entered without impact can be highlighted. When the real-time engine speed n_ice falls into the speed range that can be entered without impact, a first prompt signal is generated (such as highlighting the range), indicating that the corresponding gear can be engaged. When the real-time engine speed n_ice does not fall into the speed range that can be entered without impact, a second prompt signal is generated (such as the upshift and downshift indicator lights), instructing the driver to actively guide n_ice to the target gear range by adjusting the accelerator or brake.

[0031] A method for a speed matching guidance system for a synchronizerless mechanical transmission, comprising the following specific steps:

[0032] Step S1: Determine if the clutch is depressed. If not, continue monitoring. If yes, proceed to step S2.

[0033] Step S2: Disengage the gear, release the clutch pedal, and the signal acquisition module acquires the clutch pedal status signal, the real-time engine speed n_ice, and the transmission output shaft speed n_out;

[0034] Step S3: Calculate the ideal engine speed n_req required to enter each forward gear based on the transmission output shaft speed n_out and the pre-stored gear ratios i.

[0035] Step S4: Calculate the speed range that can be entered without impact based on the allowable speed difference threshold as [n_req+Δ_min, n_req+Δ_max];

[0036] Step S5: Send each gear range to the instrument panel, and set the dynamic display of the speed range that can be entered without shock on the engine tachometer. The upshift indicator and downshift indicator are set on the outside of the speed range that can be entered without shock.

[0037] Step S6: Determine if the speed gear is appropriate. If it is appropriate, proceed to step S8; otherwise, proceed to step S7.

[0038] Step S7: Calculate the speed range of adjacent gears, send upshift or downshift guidance signal, and illuminate upshift or downshift indicator light. The driver controls the accelerator pedal according to the guidance of the indicator light.

[0039] Step S8: Highlight the available gear and RPM range;

[0040] Step S9: Engage the target gear.

[0041] Among them, the speed range that can be entered without impact is a visual range. The starting position and width of this area dynamically correspond to the lower and upper limits of the speed range that can be entered without impact at the current vehicle speed. The position and size of the speed range that can be entered without impact continuously slide and change with the change of vehicle speed.

[0042] Reference Figure 2 and Figure 3 The system features two speed ranges marked "3" and "4" for smooth entry. The "3" range covers 1750-1850 rpm, and the background color is red when the speed exceeds 1500 rpm. The "4" range covers 1000-1100 rpm, and the background color is cyan when the speed exceeds 1500 rpm. When the engine speed is within the "3" and "4" ranges, upshift and downshift indicator lights remind the user how to adjust the engine speed to achieve the required speed. When the engine pointer falls into a smooth entry speed range, that area will be highlighted, flashed, or change color to green, providing a strong visual cue.

[0043] Example 2:

[0044] Based on Example 1, a hardware switch for upshifting and downshifting can be added. While clarifying the driver's needs, the ECU can automatically perform slight "fuel replenishment", "fuel cut-off" or "exhaust suppression" operations to assist in speed matching.

[0045] Example 3:

[0046] The difference between Example 3 and Example 1 is that the upshift indicator and downshift indicator can also be replaced by numbers or arrows directly in the center of the instrument panel.

[0047] This invention primarily protects the method of "calculating and dynamically displaying the speed range that can be entered without impact based on the output shaft speed". This method is fundamentally different from the economic shift reminder, and uses a control strategy of passive prompting and active guidance.

[0048] The above provides a detailed description of the speed matching guidance system and method for a synchronizerless mechanical transmission provided by the present invention. The specific embodiments are only used to help understand the method and core ideas of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A speed matching guidance system for a synchronizerless mechanical transmission, characterized by: Including signal sensing module, rotation speed matching calculation module and interactive guiding module, the signal sensing module is connected with the rotation speed matching calculation module, the interactive guiding module is connected with the rotation speed matching calculation module, and the gear position is switched according to data guidance.

2. A speed matching guidance system for a synchronizerless mechanical transmission according to claim 1, characterized in that: The signal sensing module includes clutch pedal high position switch, engine rotation speed sensor and output shaft rotation speed sensor, the clutch pedal high position switch collects clutch pedal state signal, the engine rotation speed sensor collects engine real-time rotation speed n_ice, and the output shaft rotation speed sensor collects transmission output shaft rotation speed n_out.

3. A synchronizerless mechanical transmission speed-matching guidance system according to claim 2, characterized in that: The rotation speed matching calculation module is a central processing unit ECU, the central processing unit ECU calculates the ideal engine rotation speed n_req required for each forward gear position and the engine rotation speed interval corresponding to each gear position that can be shocklessly entered.

4. A synchronizerless mechanical transmission speed matching guidance system according to claim 3, characterized in that: The interactive guiding module includes upshift and downshift indicator lights and a shocklessly-enterable rotation speed interval, the shocklessly-enterable rotation speed interval is dynamically displayed on the engine speed dial, the shocklessly-enterable rotation speed interval changes in real time with the change of vehicle speed, and the upshift and downshift indicator lights are arranged outside the shocklessly-enterable rotation speed interval.

5. A method of speed matching guidance for a synchronizerless mechanical transmission according to any one of claims 1-4, characterized in that: The specific steps are as follows: Step S1, it is judged whether the clutch is in the state of stepping down, if not, continuously monitoring, if yes, executing step S2; Step S2, performing gear shifting, releasing the clutch pedal, the signal acquisition module collects the clutch pedal state signal, the engine real-time rotation speed n_ice and the transmission output shaft rotation speed n_out; Step S3, ECU calculates the ideal engine rotation speed n_req required for entering each forward gear position; Step S4, according to the preset allowable rotation speed difference threshold [Delta_min, Delta_max], the shocklessly-enterable rotation speed interval [n_req+Delta_min, n_req+Delta_max] corresponding to each gear position is calculated; Step S5, sending each gear interval to the instrument; Step S6, it is judged whether the rotation speed gear position is appropriate, if appropriate, executing step S8, if inappropriate, executing step S7; Step S7, calculating the rotation speed interval of the adjacent gear position, sending the upshift or downshift guiding signal, lighting the upshift or downshift indicator light, and the driver controls the accelerator pedal according to the indication of the indicator light; Step S8, highlighting the enterable gear position and rotation speed interval; Step S9, engaging the target gear position.

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