-
Calibration
Development Using Climatic Chamber
通过环境仓完成系统标定
Traditional calibration process uses
territory vehicle trips to calibrate various
engine and
vehicle functions. The goal
is to expose the energy management system (EMS) to
extreme
temperature and environment.
This ensures the system will operate appropriately
under
stressed conditions. The vehicle
test trips often compose of hot, cold, and
altitude conditions.
Because the test
trips are sensitive to suitable weather
conditions, using climatic chambers
for
extreme temperature testing has been used to
supplement calibration process when
seasonal constraints and production
timing do not line up. In order to meet the
F-series Euro
II SOP in July, the
process is to use exclusively climatic chamber for
calibration and
validation instead of
territory test trips.
要标定全面的引擎和汽车性能参数
,
传统的方法是通过驾驶被测车辆进行一次道路三高
试验来完成测试
.
目的是为了把汽车的发动机管理系统
暴露在极端条件下
(
温度和环境
).<
/p>
这保证了所有的系统在比较恶劣的环境下能够正常有效的运行
.<
/p>
而这样的旅行常常包含
高温
,
低温
,
高海拔条件
.
由于这样的旅行测试对气候条件非常敏感
,
因此当标定工作被季
节或者产品开发时间所限制的时候
,
我们把环境仓测试当作普通标定过程的一种补充形
式
< br>.
为了达到
7
月份
F
系列发动机
欧
II
排放的标准
,
这
次标定完全由环境仓来代替传统
的自然环境标定过程
.
While territory test trips have certain
benefits such as lower cost and expose vehicles to
greater range of conditions, there are
benefits to using climatic chamber. The benefits
are:
和传统旅行标定方式拥有低成本
,
< br>参数广泛全面等优点一样
,
环境仓标定方法也有自己的<
/p>
好处
:
1)
Controllability
可控性
It is easier
to adjust the temperature/barometric pressure to
the exact condition
that is not always
possible in actual vehicle test trip. In test
trips, you are at the
mercy of the
weather conditions. Sometimes it may not be at
the extreme
conditions you are looking
for.
能够精确调节大气压力和温度
,
并且还能模拟一些自然中不太可能存在的天
气状况
.
传统测试过程往往受自然气候条件的限制
,
而
且有些时候寻找一些理
想的极端天气状况会非常困难
.
2)
Repeatability
可重复性
For
calibration, repeatable environment is critical to
resolve issues. Being able to
set up
the chamber to the exact condition removes the
ambiguity from day-to-day
differences
in weather conditions.
在标定工作中
,
对解决问题来说
,
可重复性的环境
参数非常重要
.
通过环境仓
,
我
们可以把每次测试都保证在一个精确的模拟天气条件下
,
这样消除了自然环
境下每天测试天气参数无法完全相
同的问题
.
3)
Speed
迅速的
Mhsu
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3/25/2013
Since the climatic chamber is located
on site near the engineering center, there is
a greater support staff on site to help
with any development problem. This is
contrary to territory trip where the
team must bring everything they need on the
trip. Any uncompleted tasks during a
territory test trip will need to be repeated
later if the weather does cooperate.
由于环境仓位于工程开发中心的旁边
,
当我们遇到任何问题时
,
都能够从工
程
师或技术人员那里获得迅速而及时有效的技术支持或帮助
.<
/p>
而传统旅行标定
往往一开始就需要把所有的技术团队和工具都带在
身边
,
并且任何由于天气
状况不符合测
试要求而造成的任务未完成都需要整个标定工作重新开始
.
For the above reasons, climatic
chambers have been used as part of the calibration
process.
基于以上原因
,
环
境仓被作为整个标定过程的一部分
.
Engine and
vehicle calibrations are not an exact science due
to the complex nature of the
powertrain, vehicle, and legal
interactions. The goal of the calibration process
is to find
optimal points of the system
to meet functional requirements, robustness
assurance, and
government regulations.
The calibration engineers often make trade off to
satisfy all three
criteria. The
decision process is based on knowledge and
experience.
由于动力系统
,
汽车与法律的相互干涉和交互作用
,
发动机和汽车的标
定无法成为一门精
确的科学
.
因此标定
工作就是为了在系统中寻求一个最优点
,
能使产品能够满足功能
需求
,
鲁棒性保证和政府相关法规的要求
.
标定工程师们常常设法同时满足这三个要求
.
而得出
结论的过程是同时基于知识和经验
..Th
e following sections are not meant to be an all
encompassing description of the
climatic calibration procedure but an overview the
calibration tasks using climatic
chambers.
以下的章节将给大家总体介绍一下使用环境仓的标定过程
,
而不是一个完整
,
详
细的环境
标定过程的描述
.
1)
Cold start and drive
testing
冷车启动和驾驶测试
Territory Test Trip
Chamber Test
环境仓测试
道路三高试验
Soak the
vehicle in outside
Set the desired
temperature of
Start Time
启动时间
temperature
at least 8 hours.
the chamber.
将被测车辆放置户外至少
8
小
将环境仓设置到需要温度
(measure time from
ignition
key crank to 1000
Soak for at least 8
hours.
时
rpm)
测量从点火开始到发动
Measure ambient
temperature
放置被测车辆于环境仓内
8
小
机达到
1000rpm
的时间
测量环境温度
时
Perform vehicle
starts.
Perform vehicle starts.
启动被测车辆
启动被测车辆
Measure
start time.
Measure start time.
测量启动时间
测量启动时间
Soak car
for pre-determined
Set the desired
temperature of
Driveaway
驾驶过程
hours at
outside temperature.
the
chassis roll chamber.
把底盘转毂设置到预定温度
(Evaluate drivability of the
让被测车辆处于室外温度状态
vehicle during
the drive
Soak car for at pre-
determined
下预定的时间
away.)
在驾驶过程中评估
Measure ambient
temperature.
duration.
让被测车辆运行预定时间
被测车辆的驾驶性能
测量周围温度
Mhsu
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After vehicle
starts. Perform
After vehicle starts.
Perform
various drive away actions.
various drive away actions.
在被测车辆启动之后
,
采用不同
在
被测车辆启动之后
,
采用不同
的驾驶方
式
.
的驾驶方式
.
Evaluate drivability of the
Evaluate drivability of the
vehicle during the drive away.
vehicle during the drive away.
< br>在驾驶过程中评估被测车辆驾
在驾驶过程中评估被测车辆驾
驶性
.
驶性
.
Soak car for pre-determined
Set the desired temperature of
hours at outside temperature.
the chassis roll chamber.
让被测车辆处于室外温度状态
把底盘转毂设置到预定温度
Soak car for at pre-determined
下预定的时间
Measure
ambient temperature.
duration.
让被测车辆运行预定时间
测量周围温度
After
vehicle starts. Capture
After vehicle
starts. Capture
engine speed during
idle.
engine speed during idle.
当被测车辆启动后
,
在怠速状态
当被测车辆启动后
,
在怠速状态
下测取发动机转速
.
下测取发动机转速
.
Evaluate idle quality.
Evaluate idle quality.
评估怠速质量
评估怠速质量
Fill tank
with 93 RON Fuel.
Fill tank with 93 RON
Fuel.
加满
93
号汽油
加满
93
号汽油
Evaluate start and idle
quality
Evaluate start and idle quality
using above procedures.
using above procedures.
通过以
上步骤评估启动和怠速
通过以上步骤评估启动和怠速
质量
质量
Idle
怠速
(Evaluate the idle quality)
评估怠速质量
WORST CASE
LIMIT
FUELS ROBUSTNESS
最坏情况限制
燃油鲁棒性
(Use
different quality of
fuel)
采用不同品质的燃油
2)
Hot start & drive testing
热车启动和驾驶测试
Territory Test Trip
Chamber Test
环境仓测试
道路三高试验
Start Time
Soak the vehicle in outside
Set the desired temperature of
temperature at least 4 hours
the chamber.
启动时间
during the
right period of the
将环境仓温度设置到需要的刻
(measure time
from
day.
ignition key crank
to 1000
度
.
挑选比较符合
测试条件的日期
,
Soak for at least 4
hours.
rpm)
测量从点火开始到发
动机达到
1000rpm
的时间
< br>
将被测车辆放置于户外温度环
将被测车辆放置于仓中<
/p>
4
小时
境中
4<
/p>
小时以上
以上
Measure ambient temperature
Measure start time.
测试周围温度
测试启动时间
Measure
start time.
测试启动时间
Driveaway
Soak car for at
least 4 hours at
Set the desired
temperature of
outside temperature
during the
the chassis roll chamber.
驾驶测试
把底盘转毂设置到预定温度
(Evaluate drivability of the
right period of the day.
挑选
比较符合测试条件的日期
,
Soak car for at
least 4 hours.
vehicle during the drive
away.)
将被测车辆放置于户外温度环
< br>将被测车辆放置于仓中
4
小时
在
驾驶过程中评估被测车辆
境中
4
小时以
上
以上
的驾驶性能
Measure
ambient temperature.
After vehicle
starts. Perform
various drive away
actions.
测试周围温度
Mhsu
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在被测车辆启动之后
,
采用不同
After vehicle starts. Perform
的驾驶方式
.
various
drive away actions.
Evaluate
drivability of the
在被测车辆启动之后
,
采用不同
vehicle during the
drive away.
的驾驶方式
.
在驾驶过程中评估被测车辆驾
Evaluate
drivability of the
驶性
.
vehicle during the drive away.
在驾驶过程中评估被测车辆驾
驶性
.
Soak car for at least 4 hours at
Set the desired temperature of
outside temperature.
the
chassis roll chamber.
将被测车辆放置于户外温度环
把底盘转毂设置到预定温度
Soak
car for at least 4 hours.
境中
4
小时以上
Measure
ambient temperature.
将被测车辆放置于仓中
4
小时
测试周围温度
以上
After vehicle
starts. Capture
After vehicle starts.
Capture
engine speed during idle.
engine speed during idle.
当被测车辆启动后
,
在怠速状态
当被测车辆启动后
,
在怠速状态
下测取发动机转速
.
下测取发动机转速
.
Evaluate idle quality.
Evaluate idle quality.
评估怠速质量
评估怠速质量
Fill tank
with 93 RON Fuel.
Fill tank with 93 RON
Fuel.
加满
93
号汽油
加满
93
号汽油
Evaluate start and idle
quality
Evaluate start and idle quality
using above procedures.
using above procedures.
通过以上
步骤评估启动和怠速
通过以上步骤评估启动和怠速
质量
质量
Idle
怠速测试
(Evaluate the idle quality)
评估怠速质量
WORST CASE
LIMIT
FUELS ROBUSTNESS
最坏情况限制
燃油鲁棒性测试
(Use
different quality of
fuel)
采用不同品质的燃油
3)
Hot fuel
Handling
热燃油处理
The goal of the hot fuel handling test
is to evaluate the accuracy of the model in the
strategy to
compensate for the effect
of hot injector. Typically, during a hot soak
with engine off, the injector tip
becomes hotter as fuel flow stop and
less air flow to cool the injector. During this
engine-off period,
with lower fuel
pressure, and hotter injector, the chance for fuel
vapour is much greater, especially for
returnless fuel system which can cause
lean fuel if not compensated by the strategy.
热燃油处理测试是为了评估热喷油嘴效果补偿模型的精确度
.
典型的情况是
,
当发动机在高温状态下
停止
以后
,
由于燃油流动的停止
,
没有新鲜的空气进来冷却喷油嘴
,
喷油嘴顶部温度会升高
.
在这个期间
,
油压降
低
,
喷油嘴高温
,
产生燃油蒸汽的可能性大大增加<
/p>
,
特别是没有燃油回收系统的发动机
,<
/p>
如果没有这类的补
偿策略
,
便更会出现稀燃油的情况
.
The
following tests are to verify that the system
accounts for fuel vaporization in the fuel rail
and does
not cause failure to start or
lean excursions.
以下的测试目的是证实这个系统解决了油轨中燃油
蒸汽的问题
,
并不会导致车辆启动失败或过稀
< br>
Territory Test Trip
Chamber Test
环境仓测试
道路三高试验
Start Time
Soak the vehicle in outside
Set the desired temperature of
temperature at least 4 hours
the chamber.
启动时间
during the
right period of the
将环境仓温度设置到需要的刻
(measure time
from
day.
ignition key crank
to 1000
度
.
挑选比较符合
测试条件的日期
,
rpm)
Soak for at least 4 hours.
测量从点火开始到发动机达
将被测车辆放置于户外温度环
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su
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