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CN-121989903-A - Energy control method for hybrid power delivery vehicle

CN121989903ACN 121989903 ACN121989903 ACN 121989903ACN-121989903-A

Abstract

The invention relates to the technical field of hybrid vehicles and discloses an energy control method of a hybrid vehicle, which comprises the steps of 1, collecting driving demand torque, brake pedal opening, vehicle speed, battery charge state and super capacitor voltage, generating a gating signal, 2, determining a vehicle unique working mode based on the gating signal, 3, calculating traction power demand and determining a power limiting rule in a traction driving mode, 4, generating output power of an engine and a motor, 5, determining a charging power target of an energy storage system, generating an engine total output power instruction, 6, generating a recovery power instruction in a recovery mode, and 7, summarizing the charging power target and the recovery power instruction, generating a charging power instruction and processing residual power. The invention improves the energy utilization efficiency of the hybrid power carrying vehicle.

Inventors

  • ZHANG YILI
  • PAN ZHENGGAO
  • YANG JUN
  • FANG DENG

Assignees

  • 重庆亮高科技有限公司

Dates

Publication Date
20260508
Application Date
20260410

Claims (9)

  1. 1. A method of controlling energy of a hybrid vehicle, comprising the steps of: Step 1, acquiring driving demand torque, brake pedal opening, vehicle speed, battery charge state and super capacitor voltage, generating a battery gating signal based on the battery charge state, and generating a capacitor gating signal based on the super capacitor voltage; Step 2, determining a vehicle unique working mode comprising a recovery mode and a traction driving type working mode based on the opening degree of a brake pedal, the driving required torque, a battery gating signal and a capacitor gating signal; Step3, converting the driving requirement torque into traction power requirement based on the vehicle speed in a traction driving working mode, and determining a unified power limiting rule; Step 4, under a traction driving type working mode, generating engine output power and motor output power based on a vehicle unique working mode, traction power demand, a battery gating signal, a capacitor gating signal and a unified power limiting rule; step 5, when the only working mode of the vehicle is an engine charging driving mode, determining a charging power target of the energy storage system based on the charge state of the battery, and generating an engine total output power instruction; Step 6, when the only working mode of the vehicle is a recovery mode, determining a total recovery power instruction of the motor based on recovery power corresponding to invalid output work of the engine and the opening degree of a brake pedal; and 7, summarizing the charging power target of the energy storage system and the total recycling power instruction of the motor into the total power of the energy storage system to be injected, generating a super capacitor charging power instruction and a battery charging power instruction, and performing down regulation on the residual power.
  2. 2. The method of claim 1, wherein the steps of collecting the driving demand torque, the brake pedal opening, the vehicle speed, the battery state of charge, and the super capacitor voltage, generating the battery gating signal based on the battery state of charge, and generating the capacitor gating signal based on the super capacitor voltage comprise: step 11, collecting driving demand torque, brake pedal opening, vehicle speed, battery charge state and super capacitor voltage; Step 12, generating a battery gating signal based on comparison of the collected battery state of charge with a preset battery state of charge threshold set, wherein the battery state of charge threshold set comprises a lowest state of charge threshold, a low state of charge threshold and a maximum state of charge threshold; the battery gating signal is excessively low when the battery state of charge is lower than the lowest state of charge threshold, is low when the battery state of charge is between the lowest state of charge threshold and the low state of charge threshold, is medium when the battery state of charge is between the low state of charge threshold and the maximum state of charge threshold, and is full when the battery state of charge is greater than or equal to the maximum state of charge threshold; And 13, comparing the acquired super capacitor voltage with a preset voltage grading threshold set to generate a capacitor gating signal, wherein the voltage grading threshold set comprises a lowest capacitor voltage threshold and a maximum capacitor voltage threshold, the capacitor gating signal is a capacitor voltage which is too low when the super capacitor voltage is lower than the lowest capacitor voltage threshold, the capacitor gating signal is a capacitor voltage which is sufficient when the super capacitor voltage is greater than or equal to the maximum capacitor voltage threshold, and the capacitor gating signal is a medium voltage when the super capacitor voltage is between the lowest capacitor voltage threshold and the maximum capacitor voltage threshold.
  3. 3. The method of claim 1, wherein determining a vehicle-only operating mode including a recovery mode and a traction drive-type operating mode based on a brake pedal opening, a drive demand torque, a battery gating signal, and a capacitance gating signal comprises: when the opening degree of the brake pedal is larger than zero or the driving required torque is smaller than zero, judging that the vehicle enters a recovery mode; When the opening of a brake pedal is zero and the driving required torque is greater than zero, determining that the vehicle is in a traction driving type working mode, and determining a vehicle unique working mode by combining a battery door control signal, wherein the traction driving type working mode comprises an engine charging driving mode, an engine limited electric auxiliary driving mode, a capacitor boosting mode, a hybrid power distribution mode and a pure electric priority driving mode; When the battery gating signal is that the battery electric quantity is too low, determining that the vehicle enters an engine charging driving mode; when the battery gating signal is low in power, determining that the vehicle enters an engine limiting electric auxiliary driving mode; When the battery gating signal is of medium electric quantity, the vehicle is judged to be in a unique working mode according to the capacitance gating signal, namely, when the capacitance gating signal is of sufficient capacitance voltage, the vehicle is judged to enter a capacitance boosting mode, and when the capacitance gating signal is of low or medium capacitance voltage, the vehicle is judged to enter a mixed motion distribution mode; And when the battery gating signal is full of the battery, determining that the vehicle enters a pure electric priority driving mode.
  4. 4. The method of claim 1, wherein in the traction drive type operating mode, converting the drive demand torque to the traction power demand based on the vehicle speed and determining the unified power clipping rule comprises: calculating the vehicle speed and the wheel radius to obtain the wheel angular speed, and obtaining the traction power demand based on the wheel angular speed and the driving demand torque; And setting a unified power limiting rule for each power component based on traction power requirements, so that the power command of each power component is smaller than the maximum power of the corresponding power component.
  5. 5. A method of controlling energy in a hybrid vehicle according to claim 3, wherein in a traction drive type operating mode, generating the engine output power and the motor output power based on the vehicle unique operating mode, the traction power demand, the battery gating signal, the capacitor gating signal, and the unified power clipping rule comprises: step 41, under the condition that the vehicle unique working mode is a traction driving working mode, reading the vehicle unique working mode, traction power requirement, battery gating signal, capacitance gating signal and unified power limiting rule; step 42, generating an initial engine output power value and an initial motor output power value based on the unique vehicle operating mode, the traction power demand, the battery gating signal and the capacitor gating signal; And 43, respectively limiting the initial value of the engine output power and the initial value of the motor output power according to the unified power limiting rule to obtain the engine output power and the motor output power, subtracting the sum of the engine output power and the motor output power from the traction power requirement to obtain the power shortage, supplementing the engine output power or the motor output power according to a preset fixed difference supplementing sequence when the power shortage is larger than zero, and limiting the power subjected to the difference supplementing again according to the unified power limiting rule until the power shortage is zero.
  6. 6. The method for controlling energy of a hybrid vehicle according to claim 5, wherein said step 42 specifically comprises: When the vehicle only work mode is an engine limiting electric auxiliary drive mode, taking a smaller value of traction power requirement and preset maximum auxiliary power of a motor as an initial value of motor output power, and subtracting the initial value of motor output power from the traction power requirement to be used as the initial value of engine output power; when the vehicle only working mode is a mixed distribution mode, determining a mixed distribution coefficient according to a battery gating signal and a capacitor gating signal in a table look-up manner, taking the product of the traction power requirement and the mixed distribution coefficient as an initial value of motor output power, and taking the initial value of motor output power subtracted from the traction power requirement as an initial value of engine output power; When the vehicle only work mode is a capacitor boosting mode or a pure electric priority drive mode, taking the traction power requirement as an initial value of motor output power and setting the initial value of engine output power to be zero; When the vehicle is in the engine charging drive mode, the sum of the traction power demand and the energy storage system charging power target is taken as an engine output power initial value and the motor output power initial value is set to zero.
  7. 7. The method of claim 1, wherein determining the energy storage system charge power target based on the battery state of charge and generating the engine total output power command when the vehicle only operating mode is the engine charge drive mode comprises: step 51, under the condition that the vehicle unique working mode is the engine charging driving mode, reading the vehicle unique working mode, the traction power requirement, the battery charge state, the battery gating signal, the capacitance gating signal and the unified power limiting rule; Step 52, comparing the battery state of charge with a preset minimum state of charge threshold and a preset maximum state of charge threshold to determine a battery charging power target, wherein the battery charging power target is the maximum charging power when the battery state of charge is lower than the minimum state of charge threshold, the battery charging power target is the medium charging power when the battery state of charge is between the minimum state of charge threshold and the maximum state of charge threshold, and the battery charging power target is zero when the battery state of charge is greater than the maximum state of charge threshold; Step 53, adding the traction power demand and the battery charging power target to obtain an engine total output power instruction, performing amplitude limiting processing on the engine total output power instruction according to a unified power amplitude limiting rule, setting the motor output power instruction to be zero, and when the capacitor gating signal is that the capacitor voltage is too low, preferentially distributing the battery charging power target to the super capacitor and distributing the super capacitor to the battery according to a preset charging power distribution sequence.
  8. 8. The method of claim 1, wherein when the vehicle only operation mode is the recovery mode, determining the motor total recovered power command based on the recovered power corresponding to the invalid output work of the engine and the brake pedal opening degree, comprises: Step 61, when the only working mode of the vehicle is the recovery mode, obtaining the invalid output work of the engine, and comparing the invalid output work with a zero value to obtain a larger value as the invalid output work recovery power; step 62, obtaining the opening degree of a brake pedal, and multiplying the opening degree of the brake pedal by a preset brake recovery coefficient to obtain brake recovery power; And 63, adding the invalid output power recovered power and the braking recovered power to obtain a motor total recovered power instruction, and limiting the motor total recovered power instruction within a maximum recoverable power range according to the maximum recovered power upper limit of the motor.
  9. 9. The method of claim 1, wherein the step of summing the energy storage system charging power target and the motor total recovered power command to the total power to be injected into the energy storage system, generating a super capacitor charging power command and a battery charging power command, and performing a down-regulation process on the remaining power, comprises: Step 71, acquiring and summarizing a charging power target of an energy storage system and a total recovery power instruction of a motor to obtain total power of the energy storage system to be injected; step 72, acquiring a capacitor gating signal and judging whether the super capacitor is allowed to be charged, if so, generating a super capacitor charging power instruction according to the total power of the energy storage system to be injected and the maximum charging power of the super capacitor, and if not, setting the super capacitor charging power to be zero; step 73, obtaining a battery gating signal and judging whether the battery is allowed to charge, if so, calculating the residual power and generating a battery charging power instruction, and limiting the battery charging power instruction not to exceed the maximum charging power of the battery; If the remaining power is not fully absorbed, a remaining power down-regulation process is performed, and the motor recovery power command or the energy storage system charging power target is adjusted according to the down-regulated power, step 74.

Description

Energy control method for hybrid power delivery vehicle Technical Field The invention belongs to the technical field of hybrid vehicles, and particularly relates to an energy control method of a hybrid carrier vehicle. Background With the continuous increase of environmental protection requirements, hybrid vehicles are becoming one of the mainstream vehicles. By combining the internal combustion engine and the motor, the hybrid vehicle can effectively reduce fuel consumption and harmful emissions. To achieve this goal, accurate energy control methods have a critical role in optimizing vehicle performance and improving fuel economy. Conventional hybrid vehicles often face a problem in that the energy management system is not able to optimize the energy distribution sufficiently in different driving modes. Particularly, in the recovery mode, the traction driving mode and the charging mode, how to accurately control the charge and discharge states of each energy storage unit becomes a key factor for improving the overall performance and the economy. The current energy management strategies generally fail to fully consider how to dynamically adjust energy distribution according to different driving requirements, energy storage states and recovery requirements, resulting in lower energy recovery efficiency and failure to effectively avoid overcharge or overdischarge conditions. In addition, the prior art mostly adopts fixed energy recovery and distribution strategies, lacks real-time monitoring and adjustment to the running state of the vehicle, and cannot well meet the energy requirements under different driving conditions. Particularly, in the complex working modes of the vehicle, such as an engine charging driving mode, a capacitor boosting mode and the like, how to utilize the battery and the capacitor to recover and store energy to the maximum extent while ensuring safety and stability is still a technical problem. Disclosure of Invention The invention provides an energy control method for a hybrid power carrying vehicle, which solves the technical problems of unbalanced energy recovery and distribution, inaccurate power control and over-charging or over-discharging of an energy storage unit in the related art. The invention provides an energy control method of a hybrid power delivery vehicle, which comprises the following steps: Step 1, acquiring driving demand torque, brake pedal opening, vehicle speed, battery charge state and super capacitor voltage, generating a battery gating signal based on the battery charge state, and generating a capacitor gating signal based on the super capacitor voltage; Step 2, determining a vehicle unique working mode comprising a recovery mode and a traction driving type working mode based on the opening degree of a brake pedal, the driving required torque, a battery gating signal and a capacitor gating signal; Step3, converting the driving requirement torque into traction power requirement based on the vehicle speed in a traction driving working mode, and determining a unified power limiting rule; Step 4, under a traction driving type working mode, generating engine output power and motor output power based on a vehicle unique working mode, traction power demand, a battery gating signal, a capacitor gating signal and a unified power limiting rule; step 5, when the only working mode of the vehicle is an engine charging driving mode, determining a charging power target of the energy storage system based on the charge state of the battery, and generating an engine total output power instruction; Step 6, when the only working mode of the vehicle is a recovery mode, determining a total recovery power instruction of the motor based on recovery power corresponding to invalid output work of the engine and the opening degree of a brake pedal; and 7, summarizing the charging power target of the energy storage system and the total recycling power instruction of the motor into the total power of the energy storage system to be injected, generating a super capacitor charging power instruction and a battery charging power instruction, and performing down regulation on the residual power. The invention has the beneficial effects that the charging and discharging processes of the battery and the super capacitor are dynamically regulated according to the real-time data such as the working mode, traction power requirement, battery charge state, capacitor voltage and the like of the vehicle, so that the efficient recovery and reasonable distribution of energy are ensured, the condition of overcharge or overdischarge is avoided, the energy management of the vehicle in the recovery mode and the traction mode is finer, the energy waste is reduced, and the economy and the stability of the system are improved. By setting the unified power limiting rule, the overload of the power system is effectively avoided, and each power component is ensured to run in a safe power range, so that the service lif