boostcontrol
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boostcontrol [2010/07/29 11:19] twdorris |
boostcontrol [2024/03/15 11:16] (current) |
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| Instead, you want to start with a good base duty cycle table and then let the ECU fine tune from there. | Instead, you want to start with a good base duty cycle table and then let the ECU fine tune from there. | ||
| - | <more to come> | + | |
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| + | ===== Main sections ===== | ||
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| + | To keep this page more "readable", we're going to split the following sections out. | ||
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| + | * [[bcsoverview|Operational overview]] | ||
| + | * [[bcschoice|Which solenoid to use]] | ||
| + | * [[bcsinstall|Installation, including hose configurations and wiring]] | ||
| + | * [[bcssetup|Dial-in and setup]] | ||
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| + | ===== Logging support ===== | ||
| + | There are several log values available for working with the Boost tab. These include the following. | ||
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| + | * **WGSBoostTarget** - The current value the ECU is using from the Boost Target table. This is what the ECU considers its current boost target value used to drive error correction (when enabled). | ||
| + | * **WGSGear** - The gear the ECU is using for both the Boost Target Target and Base Duty Cycle tables. This is just a sanity check so you can see for sure which gear the ECU believes you're in. | ||
| + | * **WGSDuty** - The current WGS duty cycle used by the ECU. This is the final duty cycle, which will include any active error correction (WGSTrim). | ||
| + | * **WGSTrim** - The current amount of error correction applied on top of the base duty cycle. | ||
| + | * **ECUBoost** - The ECU's idea of boost based on the configuration entered into the ECU-side of the ECU Inputs tab. | ||
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| + | ===== Technical details ===== | ||
| + | The ECU's WGS output is fixed at 17hz (period of 0.06 seconds). | ||
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| + | A "duty cycle" here refers to how much of each 0.06-second period is considered "active" versus "deactive". A duty cycle (DC) of 100%, for example, just means the output is always active (tied to ground). Likewise, a DC of 0% just means it's always deactive (the output is floating). | ||
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| + | Values between these two extremes indicate how long the output is held active before being deactivated during each 0.06-second interval. A DC of 75%, for example, means the output will be tied to ground (active) for 0.75 * 0.06 = 0.045 seconds and then switched off (deactive) for the remaining 0.015 seconds, then switched on again for 0.045 seconds and switched off again for 0.015 seconds, etc. | ||
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| + | This provides a relatively smooth analog approximation to a variable value using an on-off solenoid and a digital output from the ECU. Digital outputs and simple solenoid air valves are much less expensive than analog alternatives and provide reasonable approximations. | ||
boostcontrol.1280416743.txt.gz · Last modified: 2010/07/29 11:19 by twdorris
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