Certified CNG engine
4 cyl engine
Certification
There are some considerations for certification (R110 ?)
Eg. EMI: most likely series resistors will be used, not PWM-ing (with PWM-ing, special harness would be needed to pass certification EMI test).
The Certification harness might slightly differ from the production harness. Eg.
- contains signal generator for primary trigger
- might be slightly shorter
Why certify ? Third-party certification is good for certification :-)
Trigger
- primary trigger: VR (measured 890 Ohm)
- pattern 60-2 most likely
- secondary trigger: VR
- measured 1500 Ohm
- it's not a problem, but suspicious... why is it VR ? (HALL is more usual for camshaft) What engine was the cylinder head derived from ?
Low Impedance Injectors
3.5 Ohm .. 3.8 Ohm measured, some sites say 1.7 Ohm
- as a verification: 2 injectors in series is 7..7.2 Ohm (so we can say 3.5 Ohm is probably correct)
- Opening time - 2.5 ms
- Operating temperature - 20 ° C (or -40C) to +120 ° C
- no PWM-ing (especially for certification harness)
(6.8 Ohm might be too high to open reliably).
Pressure sensors
'''MAP sensor on "air-side"
- BOSCH 10-07-133-FL1 816 0261230042
- is this in manifold ?
- CNG pressure senzor: BOSCH 0 261 230 145
- 0-5V analog signal ?
- What is the CNG pressure regulated or pressure compensation needed ?
- What is CNG pressure ? (or what is the pressure range ?)
Harness for certification
- 1 or 4 injectors ?
- signal generator
- can TUV apply 13.5V (12..14V) DC supply
- or should we include a 230V => 12V supply with the test setup ?