Description
The BRC FLYING INJECTION LPG engine control system consists of the following special components
- 1 LPG ECU
- 1 pressure relief valve
- 1 LPG distributor
- 1 nozzle which injects the LPG into the manifold
- 1 LPG thermistor
- 1 solenoid valve upstream of the expansion/relief valve
The LPG ECU incorporates the following information
- Petrol injectors inputs, originating from the petrol engine command to inhibit control in LPG mode, and return to the petrol injection time; the gas injection time is calculated depending on the petrol injection time
- Inlet air pressure input the signal of which is taken from the sensor in parallel
- LPG switch input
- Throttle angle input, the signal of which is taken from the throttle potentiometer in parallel
- Coolant temperature input, the signal of which is taken from the sensor in parallel
- Petrol ECU rev counter output, from which the engine speed signal is taken
- Petrol injectors outputs, copies the control signals from the petrol ECU during operation in petrol mode
- LPG switch output for indicating the operating mode to the engine control ECU; 0 V corresponds to an LPG operation request and 12 V corresponds to petrol operation
- Indicator light output
- Relay output to interrupt petrol pump
- LPG system diagnostics output
The LPG ECU controls the +ve 12 V supply to the solenoid valves and the specific LPG ignition advance mapping
The engine speed signal is supplied to the LPG ECU by the rev counter signal from the injection ECU in parallel with the instrument panel
The injector control of the injection ECU is cut off by the LPG ECU via a relay (closed at rest and open during LPG operation)
According to the vehicle the indicator light which indicates the LPG operating mode is integral
- Either in the LPG switch
- Or in the fascia