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CN-122008835-A - Series-parallel driving system suitable for heavy commercial vehicle and working method

CN122008835ACN 122008835 ACN122008835 ACN 122008835ACN-122008835-A

Abstract

The invention relates to the technical field of energy management of hybrid commercial vehicles, and particularly discloses a hybrid drive system suitable for a heavy commercial vehicle and a working method thereof, wherein a gear ring of a first planetary row is connected with an engine through a first clutch, the first planetary row is used as a power input node, a planet carrier of the first planetary row is connected with a planet carrier of a second planetary row, a sun gear of the first planetary row is connected with a gear ring of the second planetary row, and a sun gear of the first planetary row is also connected with a first motor; the planet carrier of the second planet row is connected with the planet carrier of the third planet row through a third clutch, and the sun gear of the second planet row is connected with the sun gear of the third planet row and is simultaneously connected with the second motor; the invention effectively controls development cost and development difficulty of control strategies, improves fuel consumption performance of the whole vehicle, and further improves fuel saving rate of the hybrid heavy truck.

Inventors

  • YANG ZHIGANG
  • XIN QIAN

Assignees

  • 陕西重型汽车有限公司

Dates

Publication Date
20260512
Application Date
20260126

Claims (10)

  1. 1. The series-parallel driving system is characterized by comprising an engine, a planetary row and a motor, wherein the planetary row comprises a first planetary row, a second planetary row and a third planetary row, the motor comprises a first motor and a second motor, a gear ring of the first planetary row is connected with the engine through a first clutch, the first planetary row is used as a power input node, a planet carrier of the first planetary row is connected with a planet carrier of the second planetary row, a sun gear of the first planetary row is connected with a gear ring of the second planetary row, and a sun gear of the first planetary row is also connected with the first motor; The planet carrier of the second planet row is connected with the planet carrier of the third planet row through a third clutch, and the sun gear of the second planet row is connected with the sun gear of the third planet row and is simultaneously connected with the second motor; The ring gear of the third planetary row is connected with the stationary member via a second clutch, and the carrier of the third planetary row is connected with the output member.
  2. 2. The parallel-series drive system for a heavy-duty commercial vehicle of claim 1, wherein an output of said engine is connected to an input member.
  3. 3. The parallel-series drive system for a heavy-duty commercial vehicle of claim 1, wherein said stationary member is a housing of a power coupling device.
  4. 4. The parallel-series drive system for a heavy-duty commercial vehicle of claim 1, wherein said output member is an output shaft or a gear or differential housing for connection with a driven component.
  5. 5. The parallel-series drive system for a heavy-duty commercial vehicle of claim 1, wherein each of said first, second and third clutches employs a multiplate or one-way clutch.
  6. 6. The parallel-serial driving system for heavy commercial vehicles according to claim 1, wherein the first motor is electrically connected to a first motor controller, and the first motor controller controls the rotation speed or torque of the first motor to realize an idle running mode, a driving mode or a power generation mode, and performs work coordination during electric power transmission; the second motor is electrically connected with a second motor controller, and the second motor controller controls the rotating speed or the torque of the second motor to realize an idle running mode, a driving mode or a power generation mode and work coordination during electric power transmission.
  7. 7. The parallel-serial driving system for heavy commercial vehicles according to claim 6, wherein the first motor controller and the second motor controller are electrically connected to a power battery, and the power battery provides electric energy for driving the first motor and the second motor, or stores electric energy generated by the first motor and the second motor.
  8. 8. The hybrid drive system of claim 1, wherein the hybrid drive system is adapted for use with a heavy duty commercial vehicle that is a plug-in hybrid vehicle or a non-plug-in hybrid vehicle.
  9. 9. Method of operating a series-parallel drive system for a heavy-duty commercial vehicle according to any of claims 1-8, comprising the steps of: s1, a series-parallel power driving system comprises two connection modes, namely an input distribution mode and a compound distribution mode; S2, an input distribution mode, namely when the second clutch is combined and the third clutch is separated, the third planetary row only plays a role of reducing speed and increasing torque, the second motor is equivalent to be coaxial with an output member, the whole planetary gear set works in the input distribution mode to meet the running requirement of a vehicle in a low-speed mode, when the required speed changes, the rotating speed of the engine is kept in a high-efficiency area by adjusting the rotating speed of the first motor, and when the external load changes, the output torque of the second motor is adjusted to provide a transient load, so that the load of the engine is kept in the high-efficiency area; And S3, in a compound distribution mode, at the moment, the second clutch is separated, the third clutch is combined, the electric power of the system in a small speed ratio range is small, at the moment, the vehicle transmission system is in a more efficient state, and meanwhile, reasonable adjustment of the rotation speed and the torque of the engine is realized.
  10. 10. The method according to claim 9, wherein the condition of the compound distribution mode in step S1 is that when the required vehicle speed is high, i.e. the required transmission ratio is smaller than the mechanical point, if the system is still operating in the input distribution mode, the first motor will generate positive torque, the second motor will generate negative torque, the power flows from the second motor to the first motor, the output power of the engine is far greater than the required power, and the power distributed to the electrical path has no power output, resulting in a decrease in the overall transmission efficiency, and the compound distribution mode is performed.

Description

Series-parallel driving system suitable for heavy commercial vehicle and working method Technical Field The invention belongs to the technical field of energy management of hybrid power commercial vehicles, and particularly relates to a hybrid drive system suitable for a heavy commercial vehicle and a working method. Background With the increasing strictness of fuel consumption regulations, the requirements of future markets and policy regulations on the fuel consumption performance of heavy commercial vehicles are higher and higher, and the development of hybrid heavy commercial vehicles becomes a common choice for various mainstream whole vehicle manufacturers. The form of the hybrid power vehicle in the field of heavy commercial vehicles at present is still mainly in series connection and parallel connection, the fuel saving rate is limited to a certain extent, and the single-row structure adopted by the traditional sedan car can not well realize the speed ratio requirement of the heavy commercial vehicle on a power transmission system under the existing motor technical level. The rear part of the transmission case is often required to be additionally provided with a 4-6 gear, so that the complexity of the system is increased, and the difficulty of system control is also improved. For the traditional P2 configuration hybrid heavy truck, the engine speed and the vehicle speed cannot be decoupled, and the single-row configuration similar to the passenger car cannot meet the wide speed ratio requirement of the heavy truck. The invention aims to provide a series-parallel type mixed dynamic configuration which meets the working condition requirement of a heavy truck and can realize double decoupling of rotating speed and torque. Disclosure of Invention The invention aims to provide a series-parallel driving system suitable for a heavy commercial vehicle and a working method. In order to solve the problems in the prior art, the technical scheme adopted by the invention is that the series-parallel driving system suitable for the heavy commercial vehicle comprises an engine, a planet row and a motor, wherein the planet row comprises a first planet row, a second planet row and a third planet row, the motor comprises a first motor and a second motor, a gear ring of the first planet row is connected with the engine through a first clutch, the first planet row is used as a power input node, a planet carrier of the first planet row is connected with a planet carrier of the second planet row, a sun gear of the first planet row is connected with a gear ring of the second planet row, and a sun gear of the first planet row is also connected with the first motor; The planet carrier of the second planet row is connected with the planet carrier of the third planet row through a third clutch, and the sun gear of the second planet row is connected with the sun gear of the third planet row and is simultaneously connected with the second motor; The ring gear of the third planetary row is connected with the stationary member via a second clutch, and the carrier of the third planetary row is connected with the output member. Preferably, the output end of the engine is connected to an input member. Preferably, the stationary member is a housing of a power coupling device. Preferably, the output member is an output shaft or a gear or differential housing for connection with a driven component. Preferably, each of the first clutch, the second clutch and the third clutch is a multi-plate clutch or a one-way clutch. Preferably, the first motor is electrically connected with a first motor controller, and the first motor controller controls the rotation speed or torque of the first motor to realize an idle running mode, a driving mode or a power generation mode, and performs work coordination during electric power transmission; the second motor is electrically connected with a second motor controller, and the second motor controller controls the rotating speed or the torque of the second motor to realize an idle running mode, a driving mode or a power generation mode and work coordination during electric power transmission. Preferably, the first motor controller and the second motor controller are both electrically connected with a power battery, and the power battery provides electric energy for driving the first motor and the second motor or stores electric energy generated by power generation of the first motor and the second motor. Preferably, the heavy commercial vehicle to which the series-parallel driving system is applicable is a plug-in hybrid vehicle or a non-plug-in hybrid vehicle. A working method of a series-parallel driving system suitable for a heavy commercial vehicle comprises the following steps: s1, a series-parallel power driving system comprises two connection modes, namely an input distribution mode and a compound distribution mode; S2, an input distribution mode, namely when the second clutch is combined and the t