A timely four-wheel drive mode speed ratio calibration system and method

Abstract

The present invention provides a timely four-wheel drive mode speed ratio verification system, wherein the system includes a signal input module, a four-wheel drive mode speed ratio calculation module, a fault confirmation module, and a fault processing module; the signal input module is used to collect input shaft speed signals, output shaft speed signals, wheel speed signals, and four-wheel drive mode signals; the four-wheel drive mode speed ratio calculation module divides the wheel speed signal by the output shaft speed signal to obtain the four-wheel drive module speed ratio i3, and determines whether the four-wheel drive module speed ratio i3 is invalid according to preset verification rules; the fault confirmation module is used to send and store fault code information after receiving the four-wheel drive mode speed ratio invalid signal; the fault processing module is used to receive the four-wheel drive mode speed ratio invalid signal and execute preset execution rules, and the preset execution rules include: after exceeding the time threshold, if the speed ratio invalid signal still exists, then decide whether to execute the two-wheel drive mode or the four-wheel drive mode according to i3.

Description

Technical Field

[0001] The present invention relates to the field of automobiles, and in particular to a timely four-wheel drive mode speed ratio calibration system and method. Background Art

[0002] With the popularity of automatic transmissions, all-wheel drive vehicles equipped with automatic transmissions are also widely used. The driver can switch between two-wheel drive mode and four-wheel drive mode according to their needs. In the two modes, the automatic transmission will recognize different vehicle speed ratios.

[0003] The existing transmission controller directly receives the four-wheel drive controller mode signal and switches the internal mode according to the signal. When an error occurs in the four-wheel drive control module, using incorrect speed ratio information may cause damage to the transmission. Summary of the Invention

[0004] In response to the defects in the prior art, the purpose of the present invention is to provide a timely four-wheel drive mode speed ratio verification system and method, which calculates and calibrates the four-wheel drive speed ratio in real time, identifies when the four-wheel drive mode speed ratio fails, and uses the calculated speed ratio as a substitute, to avoid damage to the transmission due to calling the wrong speed ratio.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solution:

[0006] According to a first aspect of the present invention, there is provided a timely four-wheel drive mode speed ratio verification system, comprising a signal input module, a four-wheel drive mode speed ratio calculation module, a fault confirmation module, and a fault processing module;

[0007] The signal input module is used to collect input shaft speed signals, output shaft speed signals, wheel speed signals, and four-wheel drive mode signals;

[0008] The four-wheel drive mode speed ratio calculation module divides the wheel speed signal by the output shaft speed signal to obtain the four-wheel drive module speed ratio i3, and determines whether the four-wheel drive module speed ratio i3 is invalid according to a preset verification rule;

[0009] The fault confirmation module is used to send and store fault code information after receiving the four-wheel drive mode speed ratio invalid signal;

[0010] The fault processing module is used to receive a four-wheel drive mode speed ratio invalid signal and execute a preset execution rule, wherein the preset execution rule includes: after exceeding a time threshold, if the speed ratio invalid signal still exists, determining whether to execute the two-wheel drive mode or the four-wheel drive mode according to i3;

[0011] The preset verification rules include:

[0012] The speed ratio when the four-wheel drive mode signal is two-wheel drive is i1, and the speed ratio when the four-wheel drive mode signal is four-wheel drive is i2. The vehicle state is determined according to the four-wheel drive mode signal. When the vehicle is in the two-wheel drive state: if i3 is in the interval [i1*i2 / 2,i2], a four-wheel drive mode speed ratio invalid signal is sent;

[0013] When the vehicle is in four-wheel drive state: if i3 is in the interval [i 1,i 1*i2 / 2], a four-wheel drive mode speed ratio invalid signal is sent.

[0014] Preferably, the signal input module also collects a shifting process signal;

[0015] The four-wheel drive mode speed ratio calculation module will also be divided into a shifting process and a non-shifting process according to the shifting process signal status. The fixed speed ratio relationship during the shifting process is i4, and the fixed speed ratio relationship during the non-shifting process is i5. Only when the deviations between i4 and i5 and the target speed ratio are within the preset deviation range, the four-wheel drive module speed ratio i3 is judged to be invalid according to the preset verification rules.

[0016] According to another aspect of the present invention, a method for verifying a speed ratio in a timely four-wheel drive mode is provided, comprising:

[0017] Collect input shaft speed signal, output shaft speed signal, wheel speed signal, and four-wheel drive mode signal;

[0018] Dividing the wheel speed signal by the output shaft speed signal to obtain a four-wheel drive module speed ratio i3, and determining whether the four-wheel drive module speed ratio i3 is invalid according to a preset verification rule;

[0019] After receiving the four-wheel drive mode speed ratio invalid signal, the fault code information is sent and stored;

[0020] After receiving the four-wheel drive mode speed ratio invalid signal, the preset execution rule is executed, and the preset execution rule includes: after exceeding the time threshold, if the speed ratio invalid signal still exists, the two-wheel drive mode or the four-wheel drive mode is determined according to i3;

[0021] The preset verification rules include:

[0022] The speed ratio when the four-wheel drive mode signal is two-wheel drive is i1, and the speed ratio when the four-wheel drive mode signal is four-wheel drive is i2. The vehicle state is determined according to the four-wheel drive mode signal. When the vehicle is in the two-wheel drive state: if i3 is in the interval [i1*i2 / 2,i2], a four-wheel drive mode speed ratio invalid signal is sent;

[0023] When the vehicle is in four-wheel drive state: if i3 is in the interval [i 1,i 1*i2 / 2], a four-wheel drive mode speed ratio invalid signal is sent.

[0024] Preferably, it also includes:

[0025] Collecting shift process signals;

[0026] According to the shifting process signal status, it is divided into shifting process and non-shifting process. The fixed speed ratio relationship in the shifting process is i4, and the fixed speed ratio relationship in the non-shifting process is i5. Only when the deviation between i4, i5 and the target speed ratio is within the preset deviation range, it is judged whether the four-wheel drive module speed ratio i3 is invalid according to the preset verification rules.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention can calculate and calibrate the four-wheel drive speed ratio in real time, and use the calculated speed ratio as a substitute after identifying that the speed ratio called in the four-wheel drive mode fails, thereby avoiding damage to the transmission due to calling the wrong speed ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0030] Figure 1 This is a schematic structural diagram of the system according to the first embodiment of the present invention;

[0031] Figure 2 Schematic diagram of the process of the second embodiment of the present invention. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without making any creative efforts shall fall within the scope of protection of the present application.

[0034] First embodiment

[0035] This embodiment provides a timely four-wheel drive mode speed ratio verification system, such as Figure 1 As shown, it includes a signal input module, a four-wheel drive mode speed ratio calculation module, a fault confirmation module, and a fault processing module.

[0036] The signal input module collects input shaft speed signals, output shaft speed signals, wheel speed signals, and the four-wheel drive mode signal. The four-wheel drive mode ratio calculation module calculates and verifies the vehicle's appropriate four-wheel drive module ratio. Upon receiving an invalid four-wheel drive mode ratio signal, the fault confirmation module issues a fault code, stores it in the chip's non-volatile memory, and sends fault information to the instrument cluster. The fault handling module executes pre-set execution rules if the four-wheel drive mode ratio is invalid.

[0037] Specifically, the design of the four-wheel drive mode speed ratio calculation module can output two speed ratios: the speed ratio corresponding to the four-wheel drive mode signal indicating a two-wheel drive state (defined as i1) and the speed ratio corresponding to the four-wheel drive mode signal indicating a four-wheel drive state (defined as i2). The four-wheel drive module speed ratio (defined as i3) can be calculated by dividing the wheel speed signal by the transmission output shaft signal. The speed ratio verification is performed when the four-wheel drive mode signal indicates a two-wheel drive state. If i3 is within the range [i1, i1*i2 / 2], a four-wheel drive mode speed ratio valid signal is issued; if i3 is within the range [i1*i2 / 2, i2], a four-wheel drive mode speed ratio invalid signal is issued. The speed ratio verification is performed when the four-wheel drive mode signal indicates a four-wheel drive state. If i3 is within the range [i1*i2 / 2, i2], a four-wheel drive mode speed ratio valid signal is issued; if i3 is within the range [i1, i1*i2 / 2], a four-wheel drive mode speed ratio invalid signal is issued.

[0038] Preferably, due to the possibility of unreliability between the vehicle speed signal and the output shaft signal, an input shaft speed signal check is added to the two signal checks. At this point, the information input module also collects the shift process signal, and the four-wheel drive mode speed ratio calculation module distinguishes the input shaft check according to the state of the shift process signal, namely, the shift process and the non-shift process. During the shift process, the input shaft speed signal and the output shaft speed signal have a fixed speed ratio relationship (defined as i4); during the non-shift process, the input shaft speed signal and the wheel speed signal also have a fixed speed ratio relationship (defined as i5). When the deviation between i4 and i5 and the target speed ratio is within a preset deviation range (adjustable through software calibration, for example, ±5%), each sensor signal is considered valid, and the four-wheel drive speed ratio check is performed based on the sensor validity. During the shift process, the input shaft, output shaft, and wheel speed speed signals do not have a fixed speed ratio relationship, so no check is introduced.

[0039] When the fault handling module receives the four-wheel drive mode speed ratio invalid signal, if the speed ratio invalid signal still exists after exceeding the time threshold, the automatic transmission internal mode will not be executed according to the four-wheel drive mode signal, and the automatic transmission four-wheel drive mode will be executed according to the actual speed ratio range, that is, the execution of two-wheel drive mode or four-wheel drive mode will be decided according to i3. If i3 is closer to i1, the two-wheel drive mode will be executed; if i3 is closer to i2, the four-wheel drive mode will be executed.

[0040] The system provided in this embodiment can calculate and calibrate the four-wheel drive speed ratio in real time, and use the calculated speed ratio as a substitute after identifying the failure of the speed ratio called in the four-wheel drive mode, thereby avoiding damage to the transmission due to calling the wrong speed ratio.

[0041] Second embodiment

[0042] This embodiment provides a timely four-wheel drive mode speed ratio verification method, such as Figure 2 As shown, it includes the following steps:

[0043] In step S1 , an input shaft speed signal, an output shaft speed signal, a wheel speed signal, and a four-wheel drive mode signal are collected.

[0044] In step S2, the vehicle's timely four-wheel drive module speed ratio is calculated and verified to determine whether the four-wheel drive mode speed ratio is invalid. Specifically, based on the speed ratio corresponding to the two-wheel drive state (defined as i1) and the speed ratio corresponding to the four-wheel drive mode signal (defined as i2), the wheel speed signal is divided by the transmission output shaft speed signal to calculate the four-wheel drive module speed ratio (defined as i3). The speed ratio verification is to judge i3 when the four-wheel drive mode signal sends a two-wheel drive state. If i3 is in the interval [i1, i1*i2 / 2], a four-wheel drive mode speed ratio valid signal is sent; if i3 is in the interval [i1*i2 / 2, i2], a four-wheel drive mode speed ratio invalid signal is sent. The speed ratio check is to judge i3 when the four-wheel drive mode signal sends the four-wheel drive state. If i3 is in the interval [i1*i2 / 2,i2], the four-wheel drive mode speed ratio valid signal is sent; if the speed ratio is i3 in the interval [i1,i1*i2 / 2], the four-wheel drive mode speed ratio invalid signal is sent.

[0045] Preferably, due to the unreality of the vehicle speed signal and the output shaft signal, an input shaft speed signal check is added on the basis of the two signal checks. At this time, the shift process signal is collected, and then the input shaft check is distinguished according to the state of the shift process signal, that is, it is divided into the shift process and the non-shift process. During the shift process, the input shaft speed signal and the output shaft speed signal have a fixed speed ratio relationship (defined as i4); during the non-shift process, the input shaft speed signal and the wheel speed signal also have a fixed speed ratio relationship (defined as i5). When the deviation of i4 and i5 from the target speed ratio is within the preset deviation range (which can be adjusted by software calibration, for example, ±5%), each sensor signal is considered valid, and the four-wheel drive speed ratio check is performed on the basis of the sensor being valid. During the shift process, the input shaft and the output shaft, and the wheel speed signals do not have a fixed speed ratio relationship, so no check is introduced.

[0046] In step S3, if the four-wheel drive mode speed ratio invalid signal is received, the fault code information is sent and stored. Specifically, after receiving the four-wheel drive mode speed ratio invalid signal, the fault code information is sent and stored in the non-volatile area of ​​the chip, and the fault code information is sent to the instrument at the same time.

[0047] In step S4, if a four-wheel drive mode speed ratio invalid signal is received, a preset execution rule is executed. Specifically, after receiving the four-wheel drive mode speed ratio invalid signal and exceeding the time threshold, if the speed ratio invalidity persists, the automatic transmission internal mode is not executed according to the four-wheel drive mode signal, and the automatic transmission four-wheel drive mode is executed according to the actual speed ratio range. That is, the execution of two-wheel drive mode or four-wheel drive mode is determined based on i3. If i3 is closer to i1, two-wheel drive mode is executed, and if i3 is closer to i2, four-wheel drive mode is executed.

[0048] The method provided in this embodiment can calculate and calibrate the four-wheel drive speed ratio in real time, and use the calculated speed ratio as a substitute after identifying the failure of the speed ratio called in the four-wheel drive mode, thereby avoiding damage to the transmission due to calling the wrong speed ratio.

[0049] The above describes the specific embodiments of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the scope of the technical concept of this invention.

Claims

1. A timely four-wheel drive mode speed ratio verification system, characterized in that: It includes signal input module, four-wheel drive mode speed ratio calculation module, fault confirmation module and fault processing module; The signal input module is used to collect input shaft speed signals, output shaft speed signals, wheel speed signals, and four-wheel drive mode signals; The four-wheel drive mode speed ratio calculation module divides the wheel speed signal by the output shaft speed signal to obtain the four-wheel drive module speed ratio i3, and determines whether the four-wheel drive module speed ratio i3 is invalid according to a preset verification rule; The fault confirmation module is used to send and store fault code information after receiving the four-wheel drive mode speed ratio invalid signal; The fault processing module is used to receive a four-wheel drive mode speed ratio invalid signal and execute a preset execution rule, wherein the preset execution rule includes: after exceeding a time threshold, if the speed ratio invalid signal still exists, determining whether to execute the two-wheel drive mode or the four-wheel drive mode according to i3; The preset verification rules include: The speed ratio when the four-wheel drive mode signal is two-wheel drive is i1, and the speed ratio when the four-wheel drive mode signal is four-wheel drive is i2. The vehicle state is determined according to the four-wheel drive mode signal. When the vehicle is in the two-wheel drive state: if i3 is in the interval [i1*i2 / 2, i2], a four-wheel drive mode speed ratio invalid signal is sent; When the vehicle is in four-wheel drive state: if i3 is in the interval [i1,i1*i2 / 2], a four-wheel drive mode speed ratio invalid signal is sent.

2. The timely four-wheel drive mode speed ratio verification system according to claim 1, characterized in that: The signal input module also collects the shifting process signal; The four-wheel drive mode speed ratio calculation module will also be divided into a shifting process and a non-shifting process according to the shifting process signal status. The fixed speed ratio relationship during the shifting process is i4, and the fixed speed ratio relationship during the non-shifting process is i5. Only when the deviations between i4 and i5 and the target speed ratio are within the preset deviation range, the four-wheel drive module speed ratio i3 is judged to be invalid according to the preset verification rules.

3. A method for checking the speed ratio of a timely four-wheel drive mode, characterized in that: include: Collect input shaft speed signal, output shaft speed signal, wheel speed signal, and four-wheel drive mode signal; Dividing the wheel speed signal by the output shaft speed signal to obtain a four-wheel drive module speed ratio i3, and determining whether the four-wheel drive module speed ratio i3 is invalid according to a preset verification rule; After receiving the four-wheel drive mode speed ratio invalid signal, the fault code information is sent and stored; After receiving the four-wheel drive mode speed ratio invalid signal, the preset execution rule is executed, and the preset execution rule includes: after exceeding the time threshold, if the speed ratio invalid signal still exists, the two-wheel drive mode or the four-wheel drive mode is determined according to i3; The preset verification rules include: The speed ratio when the four-wheel drive mode signal is two-wheel drive is i1, and the speed ratio when the four-wheel drive mode signal is four-wheel drive is i2. The vehicle state is determined according to the four-wheel drive mode signal. When the vehicle is in the two-wheel drive state: if i3 is in the interval [i1*i2 / 2, i2], a four-wheel drive mode speed ratio invalid signal is sent; When the vehicle is in four-wheel drive state: if i3 is in the interval [i1,i1*i2 / 2], a four-wheel drive mode speed ratio invalid signal is sent.

4. The method for checking the speed ratio of the timely four-wheel drive mode according to claim 3, characterized in that: Also includes: Collecting shift process signals; According to the shifting process signal status, it is divided into shifting process and non-shifting process. The fixed speed ratio relationship in the shifting process is i4, and the fixed speed ratio relationship in the non-shifting process is i5. Only when the deviation between i4, i5 and the target speed ratio is within the preset deviation range, it is judged whether the four-wheel drive module speed ratio i3 is invalid according to the preset verification rules.

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