Про снятую фишку с клапана на рейке мы уже обсуждали. Для обмана мозгов надо на разъём вешать сопротивление. Я вешал 3,8Ом. Без этого мозги включают обратку на ТНВД. Из-за падения давления машина и глохнет (или не заводится). А возможно что в дополненение мозги и форсунки отключают. Лень пока в Шоп-Мануал лезть.
Добавил через 1 деньСитуация: сканером снимаю параметры EGT_PCT и EGR_ERR. Большую часть времени EGR_PCT = 10%, а EGR_ERR = 99,2%. Даже наверно не большую часть времени, а практически всегда. Во время езды крайне редко наблюдаю кратковременные скачки EGT_PCT, и последующие за ним скачки EGR_ERR от -100% до 99,2% (бывает, что на мгновение задержится на каком-то среднем значении, к примеру -25%), потом снова EGR_PCT = 10%, EGR_ERR = 99,2%. Check не горит, ошибок нет.
Вопрос: является ли такие значения EGR_ERR нормой? Почему EGR_PCT = 10%, а не 0% даже на холостых? К примеру, у товарища
Biz EGR_PCT=25%.
Кому интересно, вот выдержка по этим параметрам из спецификации:
EGR_PCT
PID (hex): 2C
Description: Commanded EGR
Data byte: A
Min. value: 0%(no flow)
Max. value: 100%(max. flow)
Scaling/bit: 100/255 %
External test equipment SI (Metric) / English display: EGR_PCT: xxx.x%
Commanded EGR displayed as a percent. EGR_PCT shall be normalised to the maximum EGR commanded output control parameter.
EGR systems use a variety of methods to control the amount of EGR delivered to the engine.
1) If an on/off solenoid is used – EGR_PCT shall display 0% when the EGR is commanded off, 100% when the EGR system is
commanded on.
2) If a vacuum solenoid is duty cycled, the EGR duty cycle from 0 to 100% shall be displayed.
3) If a linear or stepper motor valve is used, the fully closed position shall be displayed as 0%, the fully open position shall be displayed
as 100%. Intermediate positions shall be displayed as a percent of the full-open position. For example, a stepper-motor EGR valv e that
moves from 0 to 128 counts shall display 0% at 0 counts, 100% at 128 counts and 50% at 64 counts.
4) Any other actuation method shall be normalised to display 0% when no EGR is commanded and 100% at the maximum commanded
EGR position.
EGR_ERR
PID (hex): 2D
Description: EGR Error = (EGR actual – EGR commanded) / EGR commanded * 100%
Data byte: A
Min. value: –100 % (less than commanded)
Max. value: +99.22 % (more than commanded)
Scaling/bit: 100/128 % (0 % at 128)
External test equipment SI (Metric) / English display: EGR_ERR: xxx.x%
EGR error, as a percent of commanded EGR. Often, EGR valve control outputs are not in the same engineering units as the EGR
feedback input sensors. For example, an EGR valve can be controlled using a duty-cycled vacuum solenoid, however, the feedback
input sensor is a position sensor. This makes it impossible to display "actual" versus "commanded" in the same engineering units . EGR
error solved this problem by displaying a normalised (non-dimensional) EGR system feedback parameter. EGR error is defined to be:
(actual EGR – commanded EGR) / commanded EGR.
For example if 10% EGR is commanded and 5% is delivered to the engine, the EGR_ERR is (5% – 10%) / 10 = -50% error.
EGR_ERR may be computed using various control parameters such as position, steps, counts, etc. All EGR systems must react to
quickly changing conditions in the engine; therefore, EGR_ERR will generally show errors during transient conditions. Under steady
condition, the error will be minimised (no necessarily zero, however) if the EGR system is under control.
If the control system does not use closed loop control, EGR_ERR shall not be supported.
When commanded EGR is 0%, EGR error is technically undefined. In this case EGR error should be set to 0% when actual EGR = 0%
or EGR error should be set to 99.2% when actual EGR > 0%