通用汽车充电系统问题

 通用汽车充电系统问题

Dan Hart

修复通用汽车充电系统问题

晚期通用汽车的充电系统与你在前几年看到的带内部调节器的标准交流发电机有很大不同。 如果你有通用汽车充电系统的问题,你必须首先了解它们是如何工作的。 此外,你必须使用扫描工具来确定根本原因。 否则你将不必要地更换零件。 新的通用汽车充电系统实际上被称为电力该系统旨在监测车辆电压,仅在必要时为电池充电。 通用汽车这样做是为了提高汽油里程,并减少在不需要时发电的需要。 该系统还监测电池以确定其状况,并以延长其寿命的方式为其充电。

该系统:

- 监视电池电压并估计电池状况。

- 采取纠正措施,提高怠速,并调整调节电压。

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- 通知司机任何需要注意的情况。

蓄电池状况是在点火器开启和关闭时进行测试的。 关闭时,系统等待,直到车辆长时间关闭(几个小时)后再测试蓄电池状况。 然后,它测量开路电压以确定充电状态。

当发动机运行时,电池的放电率由电池电流传感器检测。

电池电流传感器连接到电池负极

电流传感器还测试温度,以确定充电状态和首选充电速率。

电源管理系统还与车身控制模块(BCM)一起工作,该模块通过数据总线与发动机控制模块(ECM)相连。 BCM确定交流发电机的输出,并将该信息发送给ECM,以便它能控制交流发电机的开启信号。 BCM监测电池传感器电流、电池正极电压和电池温度,以计算电池如果充电率太低,BCM会进行空转增压以纠正这种情况。

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蓄电池电流传感器连接到蓄电池负极电缆上。 它有3根线,产生一个占空比为0-100%的脉冲宽度调制的5伏信号。 正常占空比被认为在5-95%之间。

当发动机运转时,ECM向交流发电机发送一个交流发电机开启信号。 交流发电机的内部调节器通过脉冲电流控制转子的电流,以获得正确的输出。 如果电压调节器检测到一个问题,它通过将现场电流线接地通知ECM。 然后,ECM与BCM检查,以获得电池温度和充电状态信息。

如果系统不能纠正问题,它将以一个充电指示器和一个维修电池充电系统(如果配备)的驾驶员信息中心信息来通知驾驶员。

ECM、BCM、电池和交流发电机作为一个系统工作。 电源管理系统有6种工作模式

电池硫酸盐化模式 -确定正确的充电协议,以纠正平板硫化状况。 如果交流发电机输出电压低于13.2V,持续45分钟,BCM将进入该模式。 BCM将进入充电模式2-3分钟。 然后BCM将根据电压要求,决定进入哪种模式。

充电模式 -BCM在检测到下列情况之一时,将进入充电模式:

雨刷器开启超过3秒。

气候控制电压提升模式请求)为真,由HVAC控制头感知。 即,你已经打开了空调

高速冷却风扇、后除雾器和HVAC高速鼓风机的运行处于开启状态。

电池温度低于0℃(32℉)。

BCM确定电池的充电状态低于80%。

车辆速度大于90英里/小时(这时不需要节省汽油)。

蓄电池电流传感器显示有故障

系统电压低于12.56V

当这些条件中的任何一个得到满足时,系统将根据电池的充电状态和估计的电池温度,将目标交流发电机输出电压设置为13.9-15.5V。

燃油经济性模式 -当电池温度至少为32°F但小于或等于176°F,计算出的电池电流小于15安培但大于-8安培,以及电池充电状态大于或等于80%时,BCM将进入节油模式。 此时,BCM将交流发电机的输出目标定为12.5-13.1V,以节省汽油。

头灯模式 -每当大灯打开时,BCM将交流发电机的输出提高到13.9-14.5伏。

启动模式 -BCM在启动后30秒内指令电压为14.5伏。

降低电压模式 -当环境空气温度高于32°F,电池电流小于1安培且大于-7安培,发电机场占空比小于99%时,BCM进入降压模式。 BCM的目标输出为12.9V。一旦满足充电模式的标准,BCM将退出此模式。

Dan Hart

Dan Hart is an automotive enthusiast and expert in car repair and maintenance. With over 10 years of industry experience, Dan has honed his skills through countless hours of working on various makes and models. His passion for cars started at a young age, and he has since turned it into a successful career.Dan's blog, Tips for Car Repair, is a culmination of his expertise and dedication to helping car owners tackle common and complex repair issues. He believes that everyone should have some basic knowledge of car repair, as it not only saves money but also empowers individuals to take control of their vehicle's maintenance.Through his blog, Dan shares practical and easy-to-follow tips, step-by-step guides, and troubleshooting techniques that break down complex concepts into understandable language. His writing style is approachable, making it suitable for both novice car owners and experienced mechanics seeking additional insights. Dan's goal is to equip his readers with the knowledge and confidence needed to tackle car repair tasks on their own, thus preventing unnecessary trips to the mechanic and expensive repair bills.In addition to maintaining his blog, Dan also runs a successful auto repair shop where he continues to serve his community by providing high-quality repair services. His dedication to customer satisfaction and his unwavering commitment to deliveringexceptional workmanship has earned him a loyal customer base over the years.When he's not under the hood of a car or writing blog posts, you can find Dan enjoying outdoor activities, attending car shows, or spending time with his family. As a true car enthusiast, he is always up-to-date with the latest industry trends and eagerly shares his insights and recommendations with his blog readers.With his vast knowledge and genuine passion for cars, Dan Hart is a trusted authority in the field of car repair and maintenance. His blog is an invaluable resource for anyone looking to keep their vehicle running smoothly and avoid unnecessary headaches.