ECM egrCAN, Инструкция по эксплуатации, Страница: 18 / 52

14
Selecting what Data is to be Sent (TPDOs)
Data send from LambdaCAN and NOxCAN(g) modules is packaged as TPDOs (Transmit
Process Data Object). Each TPDO contains two pieces of data and each module can send up
to four TPDOs. All selected TPDOs will be sent at the broadcast rate. For example, if the
broadcast rate is 5 ms and four TPDOs were selected to be sent, then eight pieces of data
would be transmitted every 5 ms. To avoid slowing down the effective data rate on the CAN
bus, select the number of TPDOs to be sent and the broadcast rate sparingly. For the case of
multiple modules sending multiple TPDOs on the same CAN bus, the minimum (i.e. fastest)
broadcast rate is given by:
Minimum Broadcast rate (ms) = The total number of TPDOs for all modules x 0.3125
For example, if there are eight modules, each sending two TPDOs, the minimum broadcast
rate is 5 ms.
The data transmitted is selected in the “Data” area of the Configuration Tool. Activate the
number of TPDOs to be used by clicking in its box to put in a check mark. Select the data
contained in each TPDO using the pull-down windows. The list of available parameters for
the LambdaCAN module is given in Table 3. The list of available parameters for the
NOxCAN(g) module is given in Table 4.
Note that in the parameter list, there are two Lambdas: LAMR (Lambda Real) and LAM
(Lambda).
LAMR is the Lambda value calculated by the module.
LAM is the Lambda value calculated by the module and modified by the Delta Lambda
Table according to the relationship:
LAM = LAMR + Delta Lambda Table value (interpolated from table)
The modified LAM (Lambda) will also influence AFR, FAR, and PHI.
Similarly for O2R and O2:
O2 = O2R + Delta O2 Table value (interpolated from table)*
* except when O2R > 18 for which O2 = O2R, regardless of table data.