解决方案说明
该解决方案是一种免提式姿势识别系统,旨在使用L99DZ200G门区系统IC来打开汽车后备箱。该解决方案通过电流检测来确保安全性,采用SPC58汽车级微控制器,并配备FlightSense™传感器可靠识别脚部运动。
驾驶员无需从口袋或钱包中取出车钥匙就可以打开后备箱,操作更加方便。此外,免提式姿势识别解决方案无需与车门把手发生物理接触,也更加卫生。通过这些使用顺畅且极具吸引力的功能,汽车制造商可以提供更先进、更友好的客户体验。
对于最近上市的许多提供类似应用的车型,众多车主对升降门的操作感到不满。我们的智能解决方案提供了一种简化方法,让车主使用预定义的脚部运动打开或关闭后备箱。该解决方案还包括基于电流检测的安全功能,在打开或关闭后备箱时如有障碍物,可避免后备箱受损。
意法半导体的免提电动升降门解决方案仅使用三种组件,可精简物料清单并简化设计。FlightSense™传感器位于保险杠下方,用于检测后备箱下方的脚部运动。一旦检测到脚部运动,通用型SPC58 C系列汽车级微控制器 (SPC58EC80E5) 会立即确认相应的模式,并将打开或关闭后备箱的命令发送至独立式汽车级门区系统IC (L99DZ200G),该芯片能够同步驱动升、降汽车尾门所需的两个电机,以及用于锁定后备箱的第三个电机。除了提供两个外部LED模块来提高驾驶员或乘客的安全性之外,L99DZ200G还包含一个发生器模式,在检测到过压时,该模式会使其H桥驱动器自动接通所有外部低侧MOSFET。
当然,为进一步确保安全性,这款免提解决方案仅限在车辆已解锁并已停泊的情况下工作。
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All Features_zh
- 技术特性
- 电源电压:12 V
- 传感器电源电压:3.3 V
- 数字逻辑电源电压:5V
- 同步驱动后备箱的三个电机
- 面向应用软件的FOTA功能
- 性能特性
- 每个电机的最大电流:35 A
- 脚部运动模式响应时间:1 s
- 认证
- 汽车级32位微控制器和门区IC
- 应用代码符合MISRA C 2012标准
- 技术特性
经销商的可用性 AEK-MOT-TK200G1
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经销商的可用性 AEK-SNS-2TOFM1
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经销商的可用性 AEK-MCU-C4MLIT1
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经销商的可用性 SPC582B-DIS
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经销商的可用性 X-NUCLEO-NFC06A1
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经销商的可用性 AEK-COM-BLEV1
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经销商的可用性 AEK-CON-SENSOR1
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经销商的可用性 AEK-AUD-C1D9031
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经销商的可用性 AEK-LCD-DT028V1
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经销商的可用性 AEK-LED-21DISM1
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该解决方案基于意法半导体的AutoDevKit™开发方案构建,该开发方案中包含一系列开发流程和工具集,能让工程师在支持完整ECU开发的通用、集成且灵活的环境中,以简便的方法实现快速评估和快速原型设计。
L99DZ200G评估板 (AEK-MOT-TK200G1) 用于驱动汽车电动尾门的开/关系统,以确保充分的安全性和可靠性。此评估板能够驱动三个不同电机。其中两个电机用于升、降汽车尾门,第三个电机则用于锁定后备箱。此评估板还能驱动两个不同的高输入能力负载,如两条LED灯带。一条用于后备箱打开时的内部照明,另一条用于车牌照明。
AEK-MOT-TK200G1评估板可用作小型ECU,满足汽车尾门的典型要求。
该评估板包含:
- SPC582B60E1 ASIL-B汽车级MCU,具有1 MB Flash存储器,通过SPI与多电机驱动器 (L99DZ200G) 通信;
- L99DZ200G门区系统IC,用于控制连接到评估板的所有负载;
- CAN连接器,使域控制器能够与AEK-MOT-TK200G1远程交互。
此外,为了支持直流电机定位和提升执行安全性,增加了用于检测L99DZ200G H桥输出电流的电路。在评估板上,该电路通过两个连接器耦合,专用于检测来自电机的霍尔传感器反馈。两个特性既可以搭配使用,也可以独立使用。
为了获得更高的安全性,还采用了服务密钥机制。此机制涉及MCU与L99DZ200G芯片之间的连续通信,能够与MCU和L99DZ200G之间的所有其他通信同时进行。
为了正确地管理L99DZ200G,必须在可配置的时间窗口内,满足服务密钥机制要求。当服务密钥失效时,L99DZ200G将断开所有输出并进入故障安全模式。服务密钥时间窗口也可以实时配置。
预定义姿势检测系统 (AEK-SNS-2TOFM1) 基于两个飞行时间测距传感器,二者相距23 cm放置。飞行时间测距传感器板件检测到运动后,会立即通过其CAN接口与SPC58EC80E5 MCU探索板 (AEK-MCU-C4MLIT1) 通信。如果识别到正确的姿势,SPC58 MCU会将打开(或关闭)后备箱的命令发送至AutoDevKit电机驱动板 (AEK-MOT-TK200G1) 上的L99DZ200G多电机驱动器。
Estimated cost
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All Evaluation Features
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- 多功能解决方案,可开发定制型子系统
- 无论目标的大小、颜色和反射率如何,高可靠性飞行时间传感器都能精确测距
- 提供MEMS传感器连接器板件,可用于开发提高车辆安全性的应用
- 可以加入NFC和蓝牙子系统,实现无钥匙进入
- 提供便于使用的开发资源,可用于添加照明和音频通信功能
- 基于模型的设计软件可缩短开发时间
汽车模拟与功率
| 产品型号 | 描述 |
|---|---|
| L99DZ200G | Automotive Front Door device with LIN and HS-CAN providing Dual H-bridge driving |
车规级微控制器
| 产品型号 | 描述 |
|---|---|
| SPC58EC80E5 | 用于汽车一般用途应用的32位Power Architecture MCU - Chorus系列 |