Haltech E6X Manual DOS Version - Manual (Page 95)

E6X Manual
95
13.16 VTECH
This function controls the solenoid used to control the variable valve timing with which some
engines are equipped. This feature acts purely to control a switching solenoid and is not
capable of controlling continuously variable valve timing.
On RPM 0 – 16000 RPM
This field defines the engine speed above which the VTECH is
enabled. This field must be greater than Off RPM or it will be
ignored.
Off RPM 0 – 16000 RPM
This field defines the engine speed below which the VTECH is
disabled. This field must be less than Off RPM or it will define
both the switch on and switch off RPM forcing the ECU to
ignore On RPM.
On Load Bar Bar 1 - 32
This field defines the engine speed above which the VTECH is
enabled. This field must be greater than Off Load Bar or it will
be ignored.
Off Load Bar Bar 1 - 32
This field defines the engine load below which the VTECH is
disabled. This field must be less than Off Load Bar or it will
define both the switch on and switch off Load forcing the ECU
to ignore On Load Bar.
The above Load and RPM conditions that control the VTECH function are independent of
one another and will switch the VTECH on if either On load or On RPM conditions are met.
The function will turn VTECH off when both Off Load and Off RPM conditions are met.
Off RPM should be set to at least 200 RPM below On RPM, forcing hysteresis in the
switching to prevent the solenoid from oscillating. The same switching gap should be applied
to Off Load Bar and on Load Bar.
13.17 BAC2
Open Loop idle control is an alternative to closed loop idle control offered in the Output
Options page. This method of control is easier to tune but less accurate and may result in the
idle speed drifting from the set point by ~100rpm. The control looks at a set of engine
conditions and drives the BAC valve with a duty cycle programmed by the user based on
these conditions. This function supports the “BAC2 Idle” trim function (refer to 4.2.4 The
In/Out Set-up Page, p49), which overrides all the parameters below if it is engaged. The idle
trim is designed as a tuning aid rather than a full time idle control solution.
The following user programmable parameters determine the period and duty cycle applied to
the BAC Valve:
Period (ms) 1 – 51 ms
This defines the period of the signal used to drive the BAC
valve.