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基于分層模型的輪轂電機(jī)驅(qū)動車輛直接橫擺力矩控制
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軍隊(duì)武器裝備預(yù)先研究項(xiàng)目(301051102)


Direct Yaw Moment Control Based on Hierarchical Model for In-wheel Motor Drive Vehicles
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    摘要:

    為提高多輪輪轂電機(jī)驅(qū)動車輛動力學(xué)綜合控制性能,,提出了一種基于分層模型的直接橫擺力矩控制策略,。上層為運(yùn)動跟蹤控制層,設(shè)計(jì)了基于車輪轉(zhuǎn)角的前饋控制器,,對車輛橫擺角速度穩(wěn)態(tài)增益進(jìn)行調(diào)節(jié),,同時將滑模控制進(jìn)行改進(jìn),設(shè)計(jì)了滑模條件積分控制器進(jìn)行反饋控制,,使橫擺角速度追蹤其期望值,;下層為轉(zhuǎn)矩優(yōu)化分配層,基于穩(wěn)定性優(yōu)先原則,,建立了以減小輪胎負(fù)荷率為目標(biāo)的優(yōu)化函數(shù),,并且將控制分配問題轉(zhuǎn)換為二次規(guī)劃問題進(jìn)行求解。依托某型8×8輪轂電機(jī)驅(qū)動樣車進(jìn)行實(shí)車試驗(yàn),,結(jié)果表明,,在連續(xù)轉(zhuǎn)向工況和雙移線工況下,所提出的控制策略使車輛最大橫擺角速度偏差分別降至理想橫擺角速度的6%和9%以內(nèi),。此外,,該策略能夠有效控制輪胎負(fù)荷率,實(shí)現(xiàn)轉(zhuǎn)向行駛時的轉(zhuǎn)矩優(yōu)化分配,,改善了車輛操縱穩(wěn)定性,。

    Abstract:

    In order to improve dynamical properties of the inwheel motor drive vehicle, a direct yawmoment control strategy with a hierarchical model was proposed. The upper layer of the strategy combined the feedforward control with the feedback control for motion tracking. More specifically, a feedforward controller based on wheel angle was designed to adjust the steadystate gain of yaw rate. Besides, the sliding mode condition integral controller was designed for feedback control, so that the yaw rate can track its expected value. The lower layer focused on the torque optimal distribution. According to the stability priority principle, the optimization function aiming at reducing the tire load rate of the vehicle was established, and the issue of torque optimal allocation was transformed into a quadratic programming problem to be solved. Based on a prototype of the 8×8 inwheel motor drive armored vehicle, a series of experiments were conducted. The experimental results showed that the proposed strategy can reduce the maximum error of yaw rate to less than 6% and 9% of the ideal yaw rate under continuous steering and double lane shifting conditions, respectively. Additionally, the proposed strategy was capable of achieving the decrease in tire load rate and the differential torque distribution of each inwheel motor. Thus the control effect was able to satisfy the requirements of continuous steering on high adhesion road and double shifting on low adhesion road. In conclusion, the proposed direct yaw moment control strategy with a hierarchical model was feasible to be applied to inwheel motor drive vehicles, and it can effectively improve the tracking ability and handling stability of the vehicle under various driving conditions.

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張征,馬曉軍,劉春光,陳路明.基于分層模型的輪轂電機(jī)驅(qū)動車輛直接橫擺力矩控制[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2019,50(12):387-394. ZHANG Zheng, MA Xiaojun, LIU Chunguang, CHEN Luming. Direct Yaw Moment Control Based on Hierarchical Model for In-wheel Motor Drive Vehicles[J]. Transactions of the Chinese Society for Agricultural Machinery,2019,50(12):387-394.

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  • 收稿日期:2019-08-26
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  • 在線發(fā)布日期: 2019-12-10
  • 出版日期: 2019-12-10
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