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To address the limitation that the traditional Automatic Emergency Braking(AEB) strategy based on Time To Collision (TTC) does not take into account the speed of the vehicle, this paper proposed a dynamic collision time threshold model that took into account the vehicle speed and an AEB control strategy based on dynamic collision time threshold was designed. In order to ensure the comfort and safety of the braking process, a two-stage braking strategy was determined and the deceleration rate was designed, using PI control to complete the vehicle deceleration control. The TTC thresholds for different vehicle speeds were determined through simulation and a dynamic crash time threshold model was established. Hardware-In-the-Loop (HIL) simulation results show that the AEB strategy designed in this paper improves the collision avoidance success rate by 47.6% compared with the traditional AEB strategy under the premise of ensuring comfort, thus has better comprehensive performance.
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针对基于碰撞时间(TTC)的传统自动紧急制动(AEB)策略未考虑自车车速的局限性,提出了一种考虑车速的动态碰撞时间阈值模型,设计了基于动态碰撞时间阈值的AEB控制策略。为保证制动过程的舒适性与安全性,确定了两级制动策略并对减速度的变化率进行限制,利用PI控制算法完成车辆减速度控制,并通过仿真确定不同车速下的TTC阈值,建立动态碰撞时间阈值模型。硬件在环仿真结果表明:在保证舒适性的前提下,相比于传统AEB策略,所设计的AEB策略避撞成功率提高了47.6%,具有更优的综合性能。
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1 Hebei University of Technology, Tianjin 300401), AuthorCompanyExt(id=1211347007847919637, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, companyId=1211347007831142419, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1 河北工业大学,天津 300401)]), AuthorCompany(id=1211347007940194327, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, xref=2, ext=[AuthorCompanyExt(id=1211347007948582936, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, companyId=1211347007940194327, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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3 Automotive Engineering Research Institute, China Automotive Technology and Research Center, Tianjin 300300), AuthorCompanyExt(id=1211347008028274718, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, companyId=1211347008011497500, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
3 中国汽车技术研究中心汽车工程研究院,天津 300300)])], figs=[ArticleFig(id=1211347009676636241, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, language=EN, label=null, caption=null, figureFileSmall=9sXDX7KdSOBdSA+rRruvjQ==, figureFileBig=WTlK+SPTfV0tTsrMsNe/9Q==, tableContent=null), ArticleFig(id=1211347009756328019, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, language=CN, label=图1, caption=
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拟合方程效果, figureFileSmall=VfSA7o3GTmc2+giknm/TWA==, figureFileBig=7K+uT2nS4BXdrjpi9s4IkQ==, tableContent=null), ArticleFig(id=1211347010259644513, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, language=EN, label=null, caption=null, figureFileSmall=JmemiYzCMtQs+sEngDjQGw==, figureFileBig=HJka7UUHtJfsKGfOD4Vttg==, tableContent=null), ArticleFig(id=1211347010330947683, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, language=CN, label=图5, caption=
感知系统硬件在环测试, figureFileSmall=JmemiYzCMtQs+sEngDjQGw==, figureFileBig=HJka7UUHtJfsKGfOD4Vttg==, tableContent=null), ArticleFig(id=1211347010406445157, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, language=EN, label=null, caption=null, figureFileSmall=smbrCHcUW3unM71REgTIbA==, figureFileBig=uUklsdAvdVddOz1XGdV3SA==, tableContent=null), ArticleFig(id=1211347010490331239, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, language=CN, label=图6, caption=
CCRs_60_50%工况制动过程, figureFileSmall=smbrCHcUW3unM71REgTIbA==, figureFileBig=uUklsdAvdVddOz1XGdV3SA==, tableContent=null), ArticleFig(id=1211347010553245801, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, language=EN, label=null, caption=null, figureFileSmall=LHejipwcNkPLirSu/PijDw==, figureFileBig=nNUgW2nvqZEAOe6scIBOUg==, tableContent=null), ArticleFig(id=1211347010620354666, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, language=CN, label=图7, caption=
CCRm_90_-25%工况制动过程, figureFileSmall=LHejipwcNkPLirSu/PijDw==, figureFileBig=nNUgW2nvqZEAOe6scIBOUg==, tableContent=null), ArticleFig(id=1211347010733600876, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, language=EN, label=null, caption=null, figureFileSmall=sJAFsHcuoz1j2WELSU3MAg==, figureFileBig=U3Zg5cDz4jK0g01fia1Hkg==, tableContent=null), ArticleFig(id=1211347010863624302, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, language=CN, label=图8, caption=
CCRb_40_-6工况制动过程, figureFileSmall=sJAFsHcuoz1j2WELSU3MAg==, figureFileBig=U3Zg5cDz4jK0g01fia1Hkg==, tableContent=null), ArticleFig(id=1211347010939121776, tenantId=1146029695717560320, journalId=1189621681917173762, articleId=1211009533598626445, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 类型 | 减速度a/g |
| η=5% | η=25% | η=50% (均值) | η=75% | η=95% |
| 平均减速度 | -0.15 | -0.29 | -0.38 | -0.42 | -0.55 |
| 最大减速度 | -0.37 | -0.58 | -0.72 | -0.82 | -0.92 |
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紧急制动规律
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| 类型 | 减速度a/g |
| η=5% | η=25% | η=50% (均值) | η=75% | η=95% |
| 平均减速度 | -0.15 | -0.29 | -0.38 | -0.42 | -0.55 |
| 最大减速度 | -0.37 | -0.58 | -0.72 | -0.82 | -0.92 |
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| 参数 | 数值 |
| 整车质量/kg | 1 463 |
| 前轴载荷/kg | 889.795 |
| 后轴载荷/kg | 573.205 |
| 质心位置坐标/m | (2.406,0,0.566) |
| 长×宽×高/m×m×m | 4.28×1.8×1.51 |
| 轴距/m | 2.537 |
| 前轮轮距/m | 1.578 |
| 后轮轮距/m | 1.544 |
| 空气阻力系数 | 0.3 |
| 迎风面积/m2 | 2.0 |
| 标准轮胎半径/m | 0.318 |
| 轮胎滚动半径/m | 0.293 |
| 挡位数量/个 | 6 |
前轮制动转矩与制动压力的比值 /N·m·(MPa)-1 | 160 |
后轮制动转矩与制动压力的比值 /N·m·(MPa)-1 | 80 |
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车辆主要参数
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| 参数 | 数值 |
| 整车质量/kg | 1 463 |
| 前轴载荷/kg | 889.795 |
| 后轴载荷/kg | 573.205 |
| 质心位置坐标/m | (2.406,0,0.566) |
| 长×宽×高/m×m×m | 4.28×1.8×1.51 |
| 轴距/m | 2.537 |
| 前轮轮距/m | 1.578 |
| 后轮轮距/m | 1.544 |
| 空气阻力系数 | 0.3 |
| 迎风面积/m2 | 2.0 |
| 标准轮胎半径/m | 0.318 |
| 轮胎滚动半径/m | 0.293 |
| 挡位数量/个 | 6 |
前轮制动转矩与制动压力的比值 /N·m·(MPa)-1 | 160 |
后轮制动转矩与制动压力的比值 /N·m·(MPa)-1 | 80 |
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| v/km·h-1 | tTTCF/s | dmin/m |
| 5 | 0.500 | 0.87 |
| 10 | 0.525 | 0.92 |
| 15 | 0.550 | 1.03 |
| 20 | 0.570 | 1.07 |
| 25 | 0.600 | 1.00 |
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低速工况下不同车速TTC阈值
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| v/km·h-1 | tTTCF/s | dmin/m |
| 5 | 0.500 | 0.87 |
| 10 | 0.525 | 0.92 |
| 15 | 0.550 | 1.03 |
| 20 | 0.570 | 1.07 |
| 25 | 0.600 | 1.00 |
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| v/km·h-1 | tTTCP/s | tTTCF/s | dmin/m |
| 30 | 1.48 | 0.54 | 1.41 |
| 35 | 1.57 | 0.60 | 1.13 |
| 40 | 1.64 | 0.69 | 1.42 |
| 45 | 1.72 | 0.73 | 1.42 |
| 50 | 1.80 | 0.80 | 1.49 |
| 55 | 1.87 | 0.86 | 1.51 |
| 60 | 1.95 | 0.92 | 1.51 |
| 65 | 2.02 | 0.98 | 1.51 |
| 70 | 2.10 | 1.04 | 1.51 |
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中速工况下不同车速TTC阈值
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| v/km·h-1 | tTTCP/s | tTTCF/s | dmin/m |
| 30 | 1.48 | 0.54 | 1.41 |
| 35 | 1.57 | 0.60 | 1.13 |
| 40 | 1.64 | 0.69 | 1.42 |
| 45 | 1.72 | 0.73 | 1.42 |
| 50 | 1.80 | 0.80 | 1.49 |
| 55 | 1.87 | 0.86 | 1.51 |
| 60 | 1.95 | 0.92 | 1.51 |
| 65 | 2.02 | 0.98 | 1.51 |
| 70 | 2.10 | 1.04 | 1.51 |
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| v/km·h-1 | tTTCP/s | tTTCF/s | dmin/m |
| 75 | 2.25 | 1.13 | 1.99 |
| 80 | 2.35 | 1.19 | 2.04 |
| 85 | 2.45 | 1.25 | 2.06 |
| 90 | 2.56 | 1.30 | 2.01 |
| 95 | 2.68 | 1.35 | 2.03 |
| 100 | 2.80 | 1.40 | 2.06 |
| 105 | 2.91 | 1.46 | 2.07 |
| 110 | 3.02 | 1.52 | 2.03 |
| 115 | 3.14 | 1.58 | 2.04 |
| 120 | 3.27 | 1.65 | 2.03 |
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高速工况下不同车速TTC阈值
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| v/km·h-1 | tTTCP/s | tTTCF/s | dmin/m |
| 75 | 2.25 | 1.13 | 1.99 |
| 80 | 2.35 | 1.19 | 2.04 |
| 85 | 2.45 | 1.25 | 2.06 |
| 90 | 2.56 | 1.30 | 2.01 |
| 95 | 2.68 | 1.35 | 2.03 |
| 100 | 2.80 | 1.40 | 2.06 |
| 105 | 2.91 | 1.46 | 2.07 |
| 110 | 3.02 | 1.52 | 2.03 |
| 115 | 3.14 | 1.58 | 2.04 |
| 120 | 3.27 | 1.65 | 2.03 |
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| TTC阈值 | 车速范围/km·h-1 |
| | 5~25 |
| | >25~75 |
| | >75~120 |
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TTC阈值模型
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| TTC阈值 | 车速范围/km·h-1 |
| | 5~25 |
| | >25~75 |
| | >75~120 |
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自车车速 /km·h-1 | 重叠率/% | 最小车距/m | 相对碰撞车速/km·h-1 |
| 策略1 | 策略2 | 策略1 | 策略2 |
| 15 | 0 | 1.023 | 5.431 | | |
| 30 | -50 | 1.467 | 2.452 | | |
| 40 | -25 | 1.350 | 0.751 | | |
| 50 | 0 | 1.403 | | | 0.084 |
| 60 | 50 | 1.537 | | | 21.607 |
| 70 | 25 | 1.541 | | | 34.189 |
| 80 | 0 | 1.962 | | | 45.453 |
| 90 | -25 | 2.007 | | | 56.189 |
| 100 | 25 | 2.034 | | | 66.589 |
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CCRs工况仿真结果
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自车车速 /km·h-1 | 重叠率/% | 最小车距/m | 相对碰撞车速/km·h-1 |
| 策略1 | 策略2 | 策略1 | 策略2 |
| 15 | 0 | 1.023 | 5.431 | | |
| 30 | -50 | 1.467 | 2.452 | | |
| 40 | -25 | 1.350 | 0.751 | | |
| 50 | 0 | 1.403 | | | 0.084 |
| 60 | 50 | 1.537 | | | 21.607 |
| 70 | 25 | 1.541 | | | 34.189 |
| 80 | 0 | 1.962 | | | 45.453 |
| 90 | -25 | 2.007 | | | 56.189 |
| 100 | 25 | 2.034 | | | 66.589 |
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自车车速 /km·h-1 | 重叠率/% | 最小车距/m | 相对碰撞车速/km·h-1 |
| 策略1 | 策略2 | 策略1 | 策略2 |
| 30 | -50 | 2.515 | 2.826 | | |
| 40 | -25 | 2.930 | 3.695 | | |
| 50 | 0 | 3.840 | 2.522 | | |
| 60 | 50 | 3.415 | 0.807 | | |
| 70 | 25 | 1.512 | 0.011 | | |
| 80 | 0 | 1.199 | | | 21.673 |
| 90 | -25 | 3.842 | | | 33.298 |
| 100 | 25 | 4.320 | | | 45.432 |
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CCRm工况仿真结果
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自车车速 /km·h-1 | 重叠率/% | 最小车距/m | 相对碰撞车速/km·h-1 |
| 策略1 | 策略2 | 策略1 | 策略2 |
| 30 | -50 | 2.515 | 2.826 | | |
| 40 | -25 | 2.930 | 3.695 | | |
| 50 | 0 | 3.840 | 2.522 | | |
| 60 | 50 | 3.415 | 0.807 | | |
| 70 | 25 | 1.512 | 0.011 | | |
| 80 | 0 | 1.199 | | | 21.673 |
| 90 | -25 | 3.842 | | | 33.298 |
| 100 | 25 | 4.320 | | | 45.432 |
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| 初始距离/m | 前车减速度/m·s-2 | 最小车距/m | 相对碰撞车速/km·h-1 |
| 策略1 | 策略2 | 策略1 | 策略2 |
| 12 | -2 | 0.511 | 0.701 | | |
| 40 | 0.453 | 0.838 | | |
| 12 | -6 | | | 14.886 | 22.921 |
| 40 | 1.361 | | | 4.979 |
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CCRb工况仿真结果
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| 初始距离/m | 前车减速度/m·s-2 | 最小车距/m | 相对碰撞车速/km·h-1 |
| 策略1 | 策略2 | 策略1 | 策略2 |
| 12 | -2 | 0.511 | 0.701 | | |
| 40 | 0.453 | 0.838 | | |
| 12 | -6 | | | 14.886 | 22.921 |
| 40 | 1.361 | | | 4.979 |
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