Electric vehicle load sensor calibration method and system

Abstract

The invention provides an electric vehicle load sensor calibration method and system. The method comprises the steps that a load sensor electric signal in the no-load state of an electric vehicle is obtained and set as a first load sensor electric signal; triggering a load sensor calibration program, acquiring a load sensor electric signal in a triggering state, and setting the load sensor electric signal as a second load sensor electric signal; setting the zero position offset of the load sensor to be equal to the first load sensor electric signal-the second load sensor electric signal; different loads are loaded on the electric vehicle, measured load sensor electric signals corresponding to the different loads are obtained, a table look-up electric signal is equal to the measured load sensor electric signals plus the zero position offset of the load sensor, the obtained table look-up electric signal is used for correspondingly looking up the load relation corresponding table, and the whole vehicle mass corresponding to the different loads is obtained. By calibrating the load sensor, the accuracy of the load sensor is improved, so that the accuracy of obtaining the quality of the whole vehicle is improved, the control accuracy of the whole vehicle is improved, and the safety performance of the vehicle is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle control, and in particular to a method and system for calibrating a load sensor of an electric vehicle. Background Art

[0002] As people's environmental awareness increases, the market share of electric vehicles is gradually increasing, and more and more technologies related to electric vehicles are involved. In recent years, in response to increasingly severe environmental pollution and energy crises, major automobile manufacturers have begun to develop new energy vehicles with high energy utilization and low emissions. As a type of new energy vehicle, pure electric vehicles are driven by motors and do not have engines. At the same time, the characteristics of the motors allow the motors to be controlled to operate as engines, that is, when the vehicle is driving, the motor can generate a driving torque to drive the vehicle to accelerate; when the vehicle is braking, the motor's reverse torque can be used to achieve braking deceleration.

[0003] The vehicle mass is an important parameter for vehicle operation. If the vehicle mass cannot be accurately determined during driving, the control accuracy of the vehicle's driving force or braking force will be poor, which may easily lead to vehicle safety problems.

[0004] In the prior art, the vehicle mass is estimated by acquiring load sensor signals. However, if the load sensor is used for a long time without calibration, the vehicle mass estimation error will be relatively large, affecting the vehicle control accuracy and causing vehicle safety problems. Summary of the invention

[0005] The present application provides an electric vehicle load sensor calibration method and system to at least solve the problem that long-term use of the load sensor leads to large errors in vehicle mass estimation, affects vehicle control accuracy, and creates vehicle safety issues.

[0006] According to one aspect of an embodiment of the present application, a method for calibrating an electric vehicle load sensor is provided, comprising:

[0007] The load sensor electrical signal of the electric vehicle in the no-load state is obtained and set as the first load sensor electrical signal;

[0008] Trigger the load sensor calibration program, obtain the load sensor electrical signal in the trigger state and set it as the second load sensor electrical signal;

[0009] Set the load sensor zero position offset = the first load sensor electrical signal - the second load sensor electrical signal;

[0010] The electric vehicle is loaded with different loads, and the electrical signals of the load sensors corresponding to the different loads are obtained. The table-lookup electrical signal = the electrical signal of the load sensor + the zero position offset of the load sensor. The obtained table-lookup electrical signal is matched to the load relationship corresponding table to obtain the vehicle mass corresponding to the different loads.

[0011] As an optional implementation, it also includes:

[0012] The electric vehicle is controlled to be in a no-load state, and an electrical signal of a load sensor of the electric vehicle in the no-load state is obtained through a vehicle controller and recorded as the first electrical signal of the load sensor.

[0013] As an optional implementation, it also includes:

[0014] The steps to trigger the load cell calibration procedure are:

[0015] Control the electric vehicle to be in no-load state;

[0016] Pull the handbrake;

[0017] Turn the electric car key to the ON position to start the car and start the timing;

[0018] The gear is in neutral;

[0019] Complete the specified trigger operations in sequence within the set time to trigger the load sensor calibration procedure.

[0020] As an optional implementation, it also includes:

[0021] The steps of specifying the trigger operation are:

[0022] Press the cruise control + button;

[0023] Press the cruise control button;

[0024] Press the cruise control + button;

[0025] Press the cruise control off button.

[0026] As an optional implementation, it also includes:

[0027] The set time is 1 minute. The vehicle controller determines whether the operation time to complete the specified trigger operation is within the set time range. If the operation time is ≤ the set time, the load sensor calibration procedure is triggered.

[0028] As an optional implementation, it also includes:

[0029] If the vehicle controller detects that the specified trigger operation steps have not been completed, the load sensor calibration procedure cannot be triggered.

[0030] As an optional implementation, it also includes:

[0031] If the operation time>the set time, the load sensor calibration procedure cannot be triggered.

[0032] As an optional implementation, it also includes:

[0033] After the vehicle controller determines that the load sensor calibration program has reached the trigger state, the load sensor electrical signal in the current trigger state is obtained and set as the second load sensor electrical signal.

[0034] As an optional implementation, it also includes:

[0035] The steps for obtaining the load relationship corresponding table are as follows:

[0036] Control electric vehicles to load different loads;

[0037] The vehicle controller collects the corresponding load sensor electrical signals under different loads and records them one by one to make a corresponding table of the load relationship between the load sensor electrical signals and the vehicle mass.

[0038] According to another aspect of the embodiment of the present application, there is also provided an electric vehicle load sensor calibration system, comprising: a vehicle controller, for controlling the running state of the vehicle;

[0039] The vehicle controller includes an information acquisition module for acquiring electrical signals from various electric control devices of the electric vehicle;

[0040] An information judgment module is used to judge the electrical signals obtained from various electronic control devices of the electric vehicle; an information storage module is used to store set information, control logic and electrical signals;

[0041] The information transmission module is used to transmit the acquired electrical signals and the electrical signals of the decisions made after judgment to the corresponding electronic control device of the electric vehicle, so as to control its operating state.

[0042] In an embodiment of the present application, a method for calibrating a load sensor of an electric vehicle is provided, including: obtaining an electric signal of a load sensor in an unloaded state of the electric vehicle and setting it as a first load sensor electric signal; triggering a load sensor calibration program, obtaining an electric signal of the load sensor in the triggered state and setting it as a second load sensor electric signal; setting the zero position offset of the load sensor = the first load sensor electric signal - the second load sensor electric signal; loading the electric vehicle with different loads, obtaining the measured load sensor electric signal corresponding to the different loads, the table lookup electric signal = the measured load sensor electric signal + the zero position offset of the load sensor, and correspondingly looking up the load relationship corresponding table of the obtained table lookup electric signal to obtain the vehicle mass corresponding to the different loads. The present application improves the accuracy of the load sensor by calibrating the load sensor, thereby improving the accuracy of obtaining the vehicle mass, improving the vehicle control accuracy, and improving the vehicle safety performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0045] Figure 1 It is a schematic diagram of a flow chart of a method for calibrating a load sensor of an electric vehicle provided in an embodiment of the present application;

[0046] Figure 2 It is a structural block diagram of an electric vehicle load sensor calibration system provided according to an embodiment of the present application.

[0047] List of parts and reference numerals:

[0048] 1. Vehicle controller, 101. Information acquisition module, 102. Information judgment module, 103. Information storage module, 104. Information transmission module. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in 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. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] The vehicle mass is an important parameter for vehicle operation. If the vehicle mass cannot be accurately determined during driving, the control accuracy of the vehicle's driving force or braking force will be poor, which may easily lead to vehicle safety problems. In the prior art, the vehicle mass is estimated by obtaining the load sensor signal, but if the load sensor is used for a long time without calibration, the vehicle mass estimation error will be relatively large, affecting the vehicle control accuracy and causing vehicle safety problems.

[0052] like Figure 1 As shown, the embodiment of the present application provides a method for calibrating an electric vehicle load sensor, comprising the following steps:

[0053] S1: obtaining an electrical signal of a load sensor in an unloaded state of an electric vehicle and setting it as a first load sensor electrical signal;

[0054] S2: triggering the load sensor calibration procedure, obtaining the load sensor electrical signal in the trigger state and setting it as the second load sensor electrical signal;

[0055] S3: Set the load sensor zero position offset = the first load sensor electrical signal - the second load sensor electrical signal;

[0056] S4: The electric vehicle is loaded with different loads, and the measured load sensor electrical signals corresponding to the different loads are obtained. The table-lookup electrical signal = the measured load sensor electrical signal + the load sensor zero point position offset. The obtained table-lookup electrical signal is matched to the load relationship corresponding table to obtain the vehicle mass corresponding to the different loads.

[0057] The present application obtains the offset of the load sensor by setting the zero position offset of the load sensor, and calibrates the electrical signal of the load sensor obtained after the electric vehicle is subsequently loaded according to the offset to obtain a more accurate vehicle mass, thereby solving the problem of long-term use of the load sensor without calibration, resulting in large errors in vehicle mass estimation, affecting vehicle control accuracy, and causing vehicle safety issues; the accuracy of vehicle mass acquisition is improved, the vehicle control accuracy is improved, and the vehicle safety performance is improved.

[0058] As an optional implementation, it also includes:

[0059] The electric vehicle is controlled to be in a no-load state, and the load sensor electrical signal of the electric vehicle in the no-load state is obtained through the vehicle controller 1 and recorded as the first load sensor electrical signal.

[0060] As an optional implementation, it also includes:

[0061] The steps to trigger the load cell calibration procedure are:

[0062] Control the electric vehicle to be in no-load state;

[0063] Pull the handbrake;

[0064] Turn the electric car key to the ON position to start the car and start the timing;

[0065] The gear is in neutral;

[0066] Complete the specified trigger operations in sequence within the set time to trigger the load sensor calibration procedure.

[0067] The present application sets a set of steps to trigger the load sensor calibration procedure, so that the user can actively control the vehicle to calibrate the load sensor according to the use of the electric vehicle.

[0068] As an optional implementation, it also includes:

[0069] The steps of specifying the trigger operation are:

[0070] Press the cruise control + button;

[0071] Press the cruise control button;

[0072] Press the cruise control + button;

[0073] Press the cruise control off button.

[0074] As an optional implementation, it also includes:

[0075] The set time is 1 minute. The vehicle controller 1 determines whether the operation time to complete the specified trigger operation is within the set time range. If the operation time is ≤ the set time, the load sensor calibration procedure is triggered.

[0076] It should be noted that the set time described in this application is set based on the usage habits and operation time of most users. The preferred implementation method in this application is 1 minute, and electric vehicle manufacturers can set it independently based on user usage habits.

[0077] It should be noted that in order to prevent users or children from making mistakes and to accurately trigger the load sensor calibration procedure, the following two implementations will not trigger the load sensor calibration procedure:

[0078] Implementation method 1:

[0079] If the vehicle controller 1 detects that the specified trigger operation steps are not completed, the load sensor calibration procedure cannot be triggered.

[0080] Implementation method 2:

[0081] If the operation time>the set time, the load sensor calibration procedure cannot be triggered.

[0082] As an optional implementation, it also includes:

[0083] After the vehicle controller 1 determines that the load sensor calibration program has reached the trigger state, the load sensor electrical signal in the current trigger state is obtained and set as the second load sensor electrical signal.

[0084] As an optional implementation, it also includes:

[0085] The steps for obtaining the load relationship corresponding table are as follows:

[0086] Control electric vehicles to load different loads;

[0087] The vehicle controller 1 collects the corresponding load sensor electrical signals under different loads and records them one by one to make a corresponding table of the load relationship between the load sensor electrical signals and the vehicle mass.

[0088] In the present application, a load relationship correspondence table is formulated to facilitate the subsequent use of the electric vehicle by obtaining the electrical signal of the load sensor or the calibrated and revised table lookup electrical signal to obtain the vehicle mass.

[0089] According to another aspect of the embodiment of the present application, a system for calibrating an electric vehicle load sensor is also provided. Figure 2 As shown, it includes: a vehicle controller 1, used to control the running state of the vehicle;

[0090] The vehicle controller 1 includes an information acquisition module 101 for acquiring electrical signals from various electric control devices of the electric vehicle;

[0091] The information judgment module 102 is used to judge the electrical signals obtained from the various electrical control devices of the electric vehicle; the information storage module 103 is used to store the set information, control logic and electrical signals;

[0092] The information transmission module 104 is used to transmit the acquired electrical signals and the electrical signals of the decisions made after judgment to the corresponding electrical control device of the electric vehicle, so as to control its running state.

[0093] The present application also provides an electric vehicle load sensor calibration system, in which a vehicle controller 1 controls the operating mode and state of the electric vehicle. Various functional modules are set in the vehicle controller 1 to meet the functions of the vehicle controller 1 to collect, process and transmit information; complete the control of the vehicle and realize the calibration of the load sensor.

[0094] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0095] If the integrated units in the above embodiments are implemented in the form of software functional units and sold or used as independent products, they can be stored in the above computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling one or more electronic devices (such as personal computers, servers, or network devices) to perform all or part of the steps of the methods described in the various embodiments of the present application.

[0096] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0097] In the several embodiments provided in the present application, it should be understood that the disclosed client can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0098] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution provided in this embodiment.

[0099] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0100] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0101] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for calibrating an electric vehicle load sensor, characterized in that: include: The load sensor electrical signal of the electric vehicle in the no-load state is obtained and set as the first load sensor electrical signal; Trigger the load sensor calibration program, obtain the load sensor electrical signal in the trigger state and set it as the second load sensor electrical signal; Set the load sensor zero position offset = the first load sensor electrical signal - the second load sensor electrical signal; The electric vehicle is loaded with different loads, and the electrical signals of the load sensors corresponding to the different loads are obtained. The table-lookup electrical signal = the electrical signal of the load sensor + the zero position offset of the load sensor. The obtained table-lookup electrical signal is matched to the load relationship corresponding table to obtain the vehicle mass corresponding to the different loads.

2. The electric vehicle load sensor calibration method according to claim 1, characterized in that: Also includes: The electric vehicle is controlled to be in a no-load state, and an electrical signal of a load sensor of the electric vehicle in the no-load state is obtained through a vehicle controller and recorded as the first electrical signal of the load sensor.

3. The electric vehicle load sensor calibration method according to claim 1, characterized in that: Also includes: The steps to trigger the load cell calibration procedure are: Control the electric vehicle to be in no-load state; Pull the handbrake; Turn the electric car key to the ON position to start the car and start the timing; The gear is in neutral; Complete the specified trigger operations in sequence within the set time to trigger the load sensor calibration procedure.

4. The electric vehicle load sensor calibration method according to claim 3, characterized in that: Also includes: The steps of specifying the trigger operation are: Press the cruise control + button; Press the cruise control button; Press the cruise control + button; Press the cruise control off button.

5. The electric vehicle load sensor calibration method according to claim 4, characterized in that: Also includes: The set time is 1 minute. The vehicle controller determines whether the operation time to complete the specified trigger operation is within the set time range. If the operation time is ≤ the set time, the load sensor calibration procedure is triggered.

6. The electric vehicle load sensor calibration method according to claim 5, characterized in that: Also includes: If the vehicle controller detects that the specified trigger operation steps have not been completed, the load sensor calibration procedure cannot be triggered.

7. The electric vehicle load sensor calibration method according to claim 5, characterized in that: Also includes: If the operation time>the set time, the load sensor calibration procedure cannot be triggered.

8. The electric vehicle load sensor calibration method according to claim 1, characterized in that: Also includes: After the vehicle controller determines that the load sensor calibration program has reached the trigger state, the load sensor electrical signal in the current trigger state is obtained and set as the second load sensor electrical signal.

9. The electric vehicle load sensor calibration method according to claim 1, characterized in that: Also includes: The steps for obtaining the load relationship corresponding table are as follows: Control electric vehicles to load different loads; The vehicle controller collects the corresponding load sensor electrical signals under different loads and records them one by one to make a corresponding table of the load relationship between the load sensor electrical signals and the vehicle mass.

10. An electric vehicle load sensor calibration system, characterized in that: include: The vehicle controller is used to control the running status of the vehicle; The vehicle controller includes an information acquisition module for acquiring electrical signals from various electric control devices of the electric vehicle; An information judgment module, used to judge the electrical signals obtained from various electronic control devices of the electric vehicle; An information storage module, used to store set information, control logic and electrical signals; The information transmission module is used to transmit the acquired electrical signals and the electrical signals of the decisions made after judgment to the corresponding electronic control device of the electric vehicle, so as to control its operating state.

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