Article(id=1204385598946648715, tenantId=1146029695717560320, journalId=1189621681917173762, issueId=1204385597805798018, articleNumber=null, orderNo=null, doi=10.19620/j.cnki.1000-3703.20220143, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=null, receivedDateStr=null, revisedDate=1649347200000, revisedDateStr=2022-04-08, acceptedDate=null, acceptedDateStr=null, onlineDate=1765077503190, onlineDateStr=2025-12-07, pubDate=1682265600000, pubDateStr=2023-04-24, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1765077503190, onlineIssueDateStr=2025-12-07, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1765077503190, creator=13701087609, updateTime=1765077503190, updator=13701087609, issue=Issue{id=1204385597805798018, tenantId=1146029695717560320, journalId=1189621681917173762, year='2023', volume='', issue='4', pageStart='1', pageEnd='62', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1765077502919, creator=13701087609, updateTime=1765079117157, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1204392368473612861, tenantId=1146029695717560320, journalId=1189621681917173762, issueId=1204385597805798018, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1204392368473612862, tenantId=1146029695717560320, journalId=1189621681917173762, issueId=1204385597805798018, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=29, endPage=35, ext={EN=ArticleExt(id=1204385599139586704, articleId=1204385598946648715, tenantId=1146029695717560320, journalId=1189621681917173762, language=EN, title=Research on Shift Decision of Two-Speed Transmissions in Battery Electric Vehicles Based on Knowledge, columnId=null, journalTitle=Automobile Technology, columnName=null, runingTitle=null, highlight=null, articleAbstract=
To solve the problem that the traditional shift schedule of two-speed transmissions for battery electric vehicles cannot obtain the optimal shift performance under different conditions, this paper proposes a knowledge-based method for shift decision-making. Firstly, the dynamic model of battery electric vehicles was established, the optimal shift data was obtained by dynamic programming. The two-parameter shift schedule was extracted based on support vector machine. Secondly, the data of manual shift was collected to build an exclusive database. The intelligent shift decision model was built based on the long short-term memory network, and the shift decision model was updated online by over-the-air technology. Finally the proposed shift decision method was verified by simulation. The results show that long short-term memory network model has high shift decision accuracy, the proposed knowledge-based shift decision method has better shifting performance than traditional two-parameter shift schedule.
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为了解决采用传统换挡规律时纯电动汽车在不同工况下难以获得最佳换挡性能的问题,提出了一种基于知识的两挡变速器挡位决策方法。首先,建立纯电动汽车动力学模型,通过动态规划获得最优挡位数据,基于支持向量机制定静态两参数换挡规律;然后采集驾驶员手动换挡数据构建专属知识库,基于长短时记忆网络建立智能挡位决策模型,通过空中下载技术实现挡位决策模型更新;最后通过仿真验证所提出方法的有效性。仿真结果表明,长短时记忆网络模型具有较高的挡位决策精度,所提出的基于知识的智能挡位决策方法相较于传统两参数换挡规律具有更好的换挡性能。
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| 参数名称 | 数值 | 参数名称 | 数值 |
| 1挡传动比 | 12.1 | 空气阻力系数 | 0.46 |
| 2挡传动比 | 7.1 | 迎风面积/m2 | 2.818 |
| 传动系统效率 | 0.95 | 质量换算系数 | 1.2 |
| 车轮半径/m | 0.337 | 电池开路电压/V | 358.248 |
| 汽车质量/kg | 2 060 | 电池内阻/Ω | 0.113 48 |
| 滚动阻力系数 | 0.007 8 | 电池总容量/A·h | 150 |
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模型参数
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| 参数名称 | 数值 | 参数名称 | 数值 |
| 1挡传动比 | 12.1 | 空气阻力系数 | 0.46 |
| 2挡传动比 | 7.1 | 迎风面积/m2 | 2.818 |
| 传动系统效率 | 0.95 | 质量换算系数 | 1.2 |
| 车轮半径/m | 0.337 | 电池开路电压/V | 358.248 |
| 汽车质量/kg | 2 060 | 电池内阻/Ω | 0.113 48 |
| 滚动阻力系数 | 0.007 8 | 电池总容量/A·h | 150 |
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| λ | ΔSsoc(k)/kW·h | Et(k)/kW·h | λ | ΔSsoc(k)/kW·h | Et(k)/kW·h |
| 0 | 5.730 5 | 153.025 9 | 0.6 | 5.548 7 | 153.123 2 |
| 0.1 | 5.730 5 | 153.025 9 | 0.7 | 5.540 7 | 153.129 5 |
| 0.2 | 5.636 4 | 153.080 6 | 0.8 | 5.533 2 | 153.133 3 |
| 0.3 | 5.619 5 | 153.092 3 | 0.9 | 5.532 9 | 153.133 5 |
| 0.4 | 5.570 5 | 153.104 2 | 1.0 | 5.532 9 | 153.133 7 |
| 0.5 | 5.561 4 | 153.112 1 | | | |
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不同经济性加权系数优化结果
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| λ | ΔSsoc(k)/kW·h | Et(k)/kW·h | λ | ΔSsoc(k)/kW·h | Et(k)/kW·h |
| 0 | 5.730 5 | 153.025 9 | 0.6 | 5.548 7 | 153.123 2 |
| 0.1 | 5.730 5 | 153.025 9 | 0.7 | 5.540 7 | 153.129 5 |
| 0.2 | 5.636 4 | 153.080 6 | 0.8 | 5.533 2 | 153.133 3 |
| 0.3 | 5.619 5 | 153.092 3 | 0.9 | 5.532 9 | 153.133 5 |
| 0.4 | 5.570 5 | 153.104 2 | 1.0 | 5.532 9 | 153.133 7 |
| 0.5 | 5.561 4 | 153.112 1 | | | |
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| 方法 | LSTM | LR | KNN | SVM | RF |
| 准确率 | 96.15 | 91.06 | 77.19 | 90.46 | 95.24 |
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不同方法的目标挡位预测准确率 %
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| 方法 | LSTM | LR | KNN | SVM | RF |
| 准确率 | 96.15 | 91.06 | 77.19 | 90.46 | 95.24 |
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| 变速器及换挡规律 | 耗电量 |
| 固定速比减速器 | 5.788 |
| 两挡变速器 | DP算法优化 | 5.533 |
| 两参数换挡规律 | 5.696 |
| 基于知识的LSTM挡位决策 | 5.536 |
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耗电量对比结果 kW·h
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| 变速器及换挡规律 | 耗电量 |
| 固定速比减速器 | 5.788 |
| 两挡变速器 | DP算法优化 | 5.533 |
| 两参数换挡规律 | 5.696 |
| 基于知识的LSTM挡位决策 | 5.536 |
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