VSI output signals

1
VSI output signals
Petrol injector starts
Petrol injector closes
Gas ECU calculating ti_b
Ti-gas(ti-b x RCoffset) x LPG_correction
Gas injector closes
Gas injector opens 1 msec later
2
Synchronise LPG inj with petrol inj
Offset
Petrol injector
LPG injector
RC
Fuel flow gr/sec
Injection time msec
3
VSI corrections

• Start enrichment.
• Warm up enrichment.
• Full load enrichment.
• System pressure.
• LPgas temperature.
• Emission correction.

4
New cable harness

• Integrated injector simulator!
• 2 cable harness versions
• With or without Bosch connectors for petrol
  injector interruption.
• Colour text identification for matching petrol
  gas injector.
• Smaller wire diameter for injector interruption
  cables (0.35mm²).
• Less wires to connect.
• May 2005

5
New injection module

• No more petrol injector plus interruption!
• Only interruption of the minus wire of each
  injector.
• Integrated injection time measuring wires, less
  wires to connect.
• During gas mode, the petrol injector is now
  switched off by current reduction. (in series
  simulation)
• Part number of injector module on cable harness
  is equal to spare part number.
• May 2005

6
Current injection module
7
New injection module
8
Fuel switch

• In house development.
• In switch integrated beeper.
• Programmable for Hall or resistive indicator.
• Thickness increased with only 2mm compared to the
  old switch.
• Reduced amount of wires 7 in stead of 8.
• Connector housing separate delivered on both
  cable
• harness and switch side!

9
Tank sender / indicator

• Measures contactless tank content, so robust and
  reliable.
• Measures tank content in 5 levels
• 80 60 40 20 and low level

10
Future developments

• Feasibility study LPG system for direct injected
  petrol engines.
• R115 certification of the VSI system, expected
  2006.
• Gas temperature steered coolant flow regulation.
• Possibility for plastic version of 2 5 cylinder
  injector rail.
• VSI-II.

11
VSI-II

• In ECU integrated injection simulation.
• Cylinder selective switching.
• In ECU integrated timing advance processor for
  CNG applications.
• Multi-use RPM input, for handling of Hall-,
  inductive- and ignition coil pulses.
• Feasibility of wide range lambda sensor read
  out.
• Communication with petrol ECU via OEM data bus
• Beginning of 2006.