CN115817196A - Vehicle speed control method and system based on battery residual electric quantity - Google Patents
Vehicle speed control method and system based on battery residual electric quantity Download PDFInfo
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- CN115817196A CN115817196A CN202211446098.4A CN202211446098A CN115817196A CN 115817196 A CN115817196 A CN 115817196A CN 202211446098 A CN202211446098 A CN 202211446098A CN 115817196 A CN115817196 A CN 115817196A
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Abstract
The invention provides a vehicle speed control method and system based on battery residual capacity, comprising the following steps: acquiring electric quantity data of a vehicle battery, and filtering the electric quantity data to obtain filtered data; performing analog-to-digital conversion on the filtered data to obtain coded data; adding a check code to the coded data to obtain data to be transmitted; transmitting the data to be transmitted to a controller for verification to obtain a residual electric quantity value of the vehicle battery; controlling the vehicle speed according to the residual electric quantity value of the vehicle battery; the invention solves the problems of unstable and inaccurate electric quantity display of the instrument in the riding or climbing process of the electric vehicle; and the problem of excessive loss caused by the large-current discharge of the battery of the electric vehicle in a low-power riding state.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a vehicle speed control method and system based on battery residual capacity.
Background
Most electric motor cars all adopt lead acid batteries on the market at present, the instrument passes through the electric door lock power supply, then through ADC analog-to-digital conversion, show battery residual capacity, traditional electric quantity check display mode is adopted to this type of mode, in addition, because the theory of operation and the discharge characteristic of lead acid batteries itself, it is unstable to cause this kind of mode electric quantity display, virtual electricity appears easily, the condition that electric quantity descends suddenly more can appear when the vehicle climbing, in addition, when battery voltage closes on the undervoltage point, vehicle climbing still is according to maximum speed and maximum current output, this discharging speed that can accelerate the battery undoubtedly, cause battery excessive loss easily, reduce the life of battery.
Disclosure of Invention
Aiming at the defects in the prior art, the vehicle speed control method and the vehicle speed control system based on the residual battery capacity solve the following technical problems:
1. the problem that the electric quantity of the instrument is displayed unstably and inaccurately in the riding or climbing process of the electric vehicle;
2. the electric motor car carries out heavy current discharge under the low electric quantity state of riding, causes the problem of excessive loss.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a vehicle speed control method based on battery remaining capacity includes:
acquiring electric quantity data of a vehicle battery, and filtering the electric quantity data to obtain filtered data;
performing analog-to-digital conversion on the filtered data to obtain coded data;
adding a check code to the coded data to obtain data to be transmitted;
transmitting the data to be transmitted to a controller for verification to obtain a residual electric quantity value of the vehicle battery;
the vehicle speed is controlled according to the residual electric quantity value of the vehicle battery.
Further, the filtering the electric quantity data includes:
filtering data according to historical time to obtain a data change degree value;
and according to the data change degree value, filtering the currently acquired electric quantity data of the vehicle battery to obtain filtering data.
Further, the calculation formula of the data change degree value is as follows:
wherein, theta is a data change degree value, N is the number of the calculated historical data, y t-n Filtered data for time t-n, x t-n The acquired electric quantity data of the vehicle battery at the t-n moment.
Further, the filtering formula in the filtering process of the currently acquired electric quantity data of the vehicle battery is as follows:
wherein, y t Is filtered data at time t, x t Data of the electric quantity of the vehicle battery, x, collected for the t-th moment t-1 For the electric quantity data of the vehicle battery collected at the t-1 moment, D is a normalization parameter, y t-1 Is the filtering data at the t-1 th moment, and theta is the data change degree value.
The beneficial effects of the further scheme are as follows: measuring the filtering degree through the historical filtering data and the historical electric quantity data to obtain a data change degree value, wherein the current electric quantity data x is larger when the data change degree value is larger t The weight is more important, when the data change degree value is smaller, the filtering degree is smaller, and y is t-1 Occupies a heavier weight, and simultaneously has electric quantity data difference value of two moments t The larger t-1 is, the larger the current data change is, so the current electric quantity data x t And the filter occupies a heavier weight, so that the sensitivity of the filter is increased.
Further, the adding the check code to the encoded data includes:
and segmenting the coded data to obtain a plurality of segments of coded data, and inserting a check code between every two adjacent segments of coded data to generate data to be transmitted.
Further, the check code generation formula is as follows:
ψ＝k·λ
wherein psi is the check code, k is the length of the encoded data segment, and λ is the position of the check code.
The beneficial effects of the further scheme are as follows: the check code changes with the length of the coded data segment and the position of the check code, for one coded data, the check code is inserted into different positions of the coded data, and each check code is different.
Further, the transmitting the data to be transmitted to the controller for verification includes:
checking the check code in the data to be transmitted, and eliminating the check code in the data to be transmitted after the check code is correct to restore the encoded data;
and obtaining the residual electric quantity value of the vehicle battery according to the restored coded data.
The beneficial effects of the further scheme are as follows: because the check code is inserted in a segmented mode, the multi-point check code is taken for verification during verification, the group of data is guaranteed to be unaffected by factors such as vibration and the like to the maximum extent, and the problem that the data is tampered cannot exist.
Further, when the residual electric quantity value of the vehicle battery is less than 10% of the total electric quantity, the vehicle speed is controlled to be 60% of the full speed, and the maximum output current of the vehicle battery is reduced to be 60% of the current limiting value.
A vehicle speed control system of a vehicle speed control method based on a remaining battery capacity includes: the system comprises a battery manager, a controller, a vehicle-mounted instrument, a charger and a one-wire bus;
the controller is respectively in communication connection with the battery manager and the charger through a wired bus;
the battery manager is used for acquiring electric quantity data of the vehicle battery, filtering the electric quantity data to obtain filtered data, performing analog-to-digital conversion on the filtered data to obtain coded data, adding a check code to the coded data to obtain data to be transmitted, and transmitting the data to be transmitted to the controller through a wire-through bus;
the controller is used for receiving the data to be transmitted, checking the data to be transmitted to obtain a residual electric quantity value of the vehicle battery, and controlling the vehicle speed based on the residual electric quantity value of the vehicle battery; the controller is also used for sending the residual electric quantity value of the vehicle battery to the vehicle-mounted instrument and controlling the charger to charge the vehicle battery;
the vehicle-mounted instrument is used for displaying the residual electric quantity value of the vehicle battery.
The invention has the beneficial effects that:
1. at the electric quantity data of gathering the vehicle battery, carry out filtering to electric quantity data and handle, get rid of unusual noise data to the influence of electric quantity data, improve the electric motor car and ride or climb the stability and the precision of in-process instrument electric quantity demonstration.
2. Before data transmission, a check code is added to the coded data, whether the data is falsified in the transmission process is checked in a check code checking mode, when the check codes are inconsistent, it is indicated that the current data is influenced by factors such as vibration in the riding or climbing process, the currently received coded data can be discarded, and the stability and the accuracy of the data are further guaranteed.
3. According to the invention, the vehicle speed is controlled according to the residual electric quantity value condition of the vehicle battery, and the problem of excessive loss caused by large-current discharge of the battery in a low-electric-quantity riding state of the electric vehicle is solved.
Drawings
FIG. 1 is a flow chart of a method for controlling vehicle speed based on battery remaining capacity;
fig. 2 is a system block diagram of a vehicle speed control system based on a remaining battery capacity.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
As shown in fig. 1, a vehicle speed control method based on a remaining amount of battery includes:
s1, acquiring electric quantity data of a vehicle battery, and filtering the electric quantity data to obtain filtered data;
in step S1, the filtering the electric quantity data includes:
filtering data according to historical time to obtain a data change degree value;
the calculation formula of the data change degree value is as follows:
wherein, theta is a data change degree value, N is the number of the calculated historical data, y t-n Filtered data for time t-n, x t-n And the acquired electric quantity data of the vehicle battery at the t-n moment.
And according to the data change degree value, filtering the currently acquired electric quantity data of the vehicle battery to obtain filtering data.
The filtering formula for filtering the currently acquired electric quantity data of the vehicle battery is as follows:
wherein, y t Is filtered data at time t, x t Data of the electric quantity of the vehicle battery, x, collected for the t-th moment t-1 For the electric quantity data of the vehicle battery collected at the t-1 moment, D is a normalization parameter, y t-1 Is the filtering data at the t-1 th moment, and theta is the data change degree value.
Measuring the filtering degree through historical filtering data and historical electric quantity data to obtain a data change degree value, wherein the larger the data change degree value is, the current electric quantity data x t The weight is more important, when the data change degree value is smaller, the filtering degree is smaller, and y is t-1 The weight of the electric quantity data is more than that of the electric quantity data, and meanwhile, the difference value | x of the electric quantity data at two moments t -x t-1 The larger the | is, the larger the current data change is, so that the current electric quantity data x t Possess ofThe weight is heavier, so that the sensitivity of filtering is increased.
S2, performing analog-to-digital conversion on the filtered data to obtain coded data;
s3, adding a check code to the coded data to obtain data to be transmitted;
in step S3, the adding of the check code to the encoded data includes:
and segmenting the coded data to obtain a plurality of segments of coded data, and inserting a check code between every two adjacent segments of coded data to generate data to be transmitted.
The check code generation formula is as follows:
ψ＝κ·λ
wherein psi is the check code, k is the length of the encoded data segment, and λ is the position of the check code.
The check code changes with the length of the coded data segment and the position of the check code, for one coded data, the check code is inserted into different positions of the coded data, and each check code is different.
S4, transmitting the data to be transmitted to a controller for verification to obtain a residual electric quantity value of the vehicle battery;
in step S4, the transmitting the data to be transmitted to the controller for verification includes:
checking the check code in the data to be transmitted, and eliminating the check code in the data to be transmitted after the check code is correct to restore the encoded data;
and obtaining the residual electric quantity value of the vehicle battery according to the restored coded data.
Because when inserting the check code, what adopted is that the segmentation is inserted and put, then when verifying, take the check code of multiple spot and verify, the at utmost guarantees that this group of data does not receive the influence of factors such as vibrations, can not have the problem that data was tampered, guarantees the stability and the precision of data.
And S5, controlling the vehicle speed according to the residual electric quantity value of the vehicle battery.
In step S5, when the remaining electric quantity value of the vehicle battery is less than 10% of the total electric quantity, the vehicle speed is controlled to 60% of the full speed, and the maximum output current of the vehicle battery is reduced to 60% of the current limit value.
As shown in fig. 2, a vehicle speed control system of a vehicle speed control method based on a remaining amount of battery includes: the system comprises a battery manager, a controller, a vehicle-mounted instrument, a charger and a one-wire bus;
the controller is respectively in communication connection with the battery manager and the charger through a wired bus;
the battery manager is used for acquiring electric quantity data of the vehicle battery, filtering the electric quantity data to obtain filtered data, performing analog-to-digital conversion on the filtered data to obtain coded data, adding a check code to the coded data to obtain data to be transmitted, and transmitting the data to be transmitted to the controller through a wire-through bus;
the controller is used for receiving the data to be transmitted, checking the data to be transmitted to obtain a residual electric quantity value of the vehicle battery, and controlling the vehicle speed based on the residual electric quantity value of the vehicle battery; the controller is also used for sending the residual electric quantity value of the vehicle battery to the vehicle-mounted instrument and controlling the charger to charge the vehicle battery;
the vehicle-mounted instrument is used for displaying the residual electric quantity value of the vehicle battery.
The controller transmits the residual electric quantity value of the vehicle battery to the vehicle-mounted instrument in real time, when the residual electric quantity value is less than 10%, the controller reduces the vehicle speed to 60% of full speed, reduces the maximum output current to 60% of current limiting value, reduces the discharging speed of the battery, and effectively prevents the excessive loss of the battery.
The beneficial effects of the invention are as follows:
1. at the electric quantity data of gathering vehicle battery, carry out filtering to electric quantity data and handle, get rid of unusual noise data to the influence of electric quantity data, improve the electric motor car and ride or climb the stability and the precision of in-process instrument electric quantity demonstration.
2. Before data transmission, a check code is added to the coded data, whether the data is falsified in the transmission process is checked in a check code checking mode, when the check codes are inconsistent, it is indicated that the current data is influenced by factors such as vibration in the riding or climbing process, the currently received coded data can be discarded, and the stability and the accuracy of the data are further guaranteed.
3. According to the invention, the vehicle speed is controlled according to the residual electric quantity value condition of the vehicle battery, and the problem of excessive loss caused by large-current discharge of the battery in a low-electric-quantity riding state of the electric vehicle is solved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A vehicle speed control method based on battery remaining capacity is characterized by comprising the following steps:
acquiring electric quantity data of a vehicle battery, and filtering the electric quantity data to obtain filtered data;
performing analog-to-digital conversion on the filtered data to obtain coded data;
adding a check code to the coded data to obtain data to be transmitted;
transmitting the data to be transmitted to a controller for verification to obtain a residual electric quantity value of the vehicle battery;
the vehicle speed is controlled according to the residual electric quantity value of the vehicle battery.
2. The vehicle speed control method based on the remaining battery power according to claim 1, wherein the filtering the power data includes:
filtering data according to historical time to obtain a data change degree value;
and according to the data change degree value, filtering the currently acquired electric quantity data of the vehicle battery to obtain filtering data.
3. The vehicle speed control method based on the remaining battery power according to claim 2, wherein the calculation formula of the data variation degree value is:
wherein, theta is a data change degree value, N is the number of the calculated historical data, y t-n Filtered data for time t-n, x t-n The data are the acquired electric quantity data of the vehicle battery at the t-n moment, and n is a data number.
4. The vehicle speed control method based on the remaining battery power according to claim 2, wherein the filtering formula in the filtering process of the currently acquired vehicle battery power data is:
wherein, y t Is filtered data at time t, x t Data of the electric quantity of the vehicle battery, x, collected for the t-th moment t-1 The electric quantity data of the vehicle battery collected at the t-1 moment, D is a normalization parameter, y t-1 Is the filtering data at the t-1 th moment, and theta is the data change degree value.
5. The vehicle speed control method based on the remaining battery power according to claim 1, wherein the adding of the check code to the encoded data comprises:
and segmenting the coded data to obtain a plurality of segments of coded data, and inserting a check code between every two adjacent segments of coded data to generate data to be transmitted.
6. The vehicle speed control method based on the remaining battery power according to claim 5, wherein the check code generation formula is:
ψ＝κ·λ
where ψ is a check code, κ is a length of the encoded data segment, and λ is a position of the check code.
7. The vehicle speed control method based on the remaining battery power according to claim 1, wherein the transmitting the data to be transmitted to the controller for verification comprises:
checking the check code in the data to be transmitted, and eliminating the check code in the data to be transmitted after the check code is correct to restore the encoded data;
and obtaining the residual electric quantity value of the vehicle battery according to the restored coded data.
8. The vehicle speed control method based on the remaining amount of battery power according to claim 1, characterized in that when the remaining amount of electric power of the vehicle battery is less than 10% of the total amount of electric power, the vehicle speed is controlled to 60% of full speed, and the maximum output current of the vehicle battery is reduced to 60% of the current limit value.
9. A vehicle speed control system of a vehicle speed control method based on a remaining battery capacity according to any one of claims 1 to 8, characterized by comprising: the system comprises a battery manager, a controller, a vehicle-mounted instrument, a charger and a one-wire bus;
the controller is respectively in communication connection with the battery manager and the charger through a wire-through bus;
the battery manager is used for acquiring electric quantity data of the vehicle battery, filtering the electric quantity data to obtain filtered data, performing analog-to-digital conversion on the filtered data to obtain coded data, adding a check code to the coded data to obtain data to be transmitted, and transmitting the data to be transmitted to the controller through a wire-through bus;
the controller is used for receiving the data to be transmitted, checking the data to be transmitted to obtain a residual electric quantity value of the vehicle battery, and controlling the vehicle speed based on the residual electric quantity value of the vehicle battery; the controller is also used for sending the residual electric quantity value of the vehicle battery to the vehicle-mounted instrument and controlling the charger to charge the vehicle battery;
the vehicle-mounted instrument is used for displaying the residual electric quantity value of the vehicle battery.
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| CN202211446098.4A CN115817196A (en) | 2022-11-18 | 2022-11-18 | Vehicle speed control method and system based on battery residual electric quantity |
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| CN202211446098.4A CN115817196A (en) | 2022-11-18 | 2022-11-18 | Vehicle speed control method and system based on battery residual electric quantity |
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