Table of Contents
Engine management is a complex task, managing different types of engines is an even bigger task. The VEMS module is capable of managing almost any engine, but the "downside" is that a lot of engine paramters must be configured.
The purpose of this section is to show what parameters influence at which stages during engine operation.
The process of bringing a cold engine from stopped to operating temperature is a process with several stages and events. Different parameters at each stage have a big impact on how the engine moves from one stage to the next. When all parameters are spot on the transition from cold to operating temperature should pass almost unnoticed.
| State | Previous event |
|---|---|
| Ready | Ignition has been turned on or engine stalled |
| Cranking | Engine rotating below the running/cranking threshold |
| Afterstart | Engine rotating above the running/cranking threshold |
| Warmup | An adjustable number of cycles have elapsed |
| Running | Engine coolant has reached operation temperature |
Table 3.1. Startup states
After the engine has reached its operating temperature and reached the 'Running' state (as seen in Figure 3.1, “ECU startup procedure diagram” ), the engine is in one of three states:
| State | Previous event |
|---|---|
| Running | Engine is idling or cruising |
| Accelerating | Throttle has been opened |
| Deccelerating | Throttle has been closed |
Table 3.2. Driving states
The three states can also be represented graphically as seen in Figure 3.2, “ECU driving diagram” .
EFI and Ignition Process - TODO
