HeightControl: Difference between revisions
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http://minkara. | Custom height controllers are common on "air suspension" (UZZ31) cars, but not on UZZ32. | ||
After market controllers are advertised as being for uzz31/32 but apparently do not work with UZZ32 | |||
A custom-built controller is theoretically possible and there are some public examples, albeit without technical details. | |||
http://minkara.car view.co.jp/en/userid/289550/car/281361/1199579/note.aspx | |||
Service manuals suggest the (stock) height control ECU includes connections for: | |||
ECU inputs include: | ECU inputs include: | ||
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ECU outputs include: | ECU outputs include: | ||
* 5 x suspension control solenoid valves. | * 5 x suspension control solenoid valves. | ||
The inputs and outputs are apparently analogue (voltage) signals rather than eg frequencies or digital data. | |||
Source: | Source: | ||
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Therefore; intercept the value from the height control sensors, and add / remove a fudge factor | Therefore; intercept the value from the height control sensors, and add / remove a fudge factor | ||
This should make the system think the car is at different height and adjust. | |||
Eg if suspension switch is high, increase values at sensor by x | Eg if suspension switch is high, increase values at sensor by x | ||
The principle would be the same as manually adjusting the height by using the fine-tuning rod at each corner of the vehicle. Ie confirm what that rod controls (eg a resistor to adjust voltage?) and the emulate / modify that value as input to the ECU,which will then adjust the car height accordingly. | |||
To ensure there is minimal side effect on the system as designed by Toyota, only allow this to work when vehicle is stationery / low speed / height switch is on high? (All those inputs are also provided in the wiring to suspension ECU). | |||
Revision as of 23:18, 21 March 2014
Custom height controllers are common on "air suspension" (UZZ31) cars, but not on UZZ32.
After market controllers are advertised as being for uzz31/32 but apparently do not work with UZZ32
A custom-built controller is theoretically possible and there are some public examples, albeit without technical details.
http://minkara.car view.co.jp/en/userid/289550/car/281361/1199579/note.aspx
Service manuals suggest the (stock) height control ECU includes connections for:
ECU inputs include:
- 4 x pressure sensors
- 4 x height control sensors
ECU outputs include:
- 5 x suspension control solenoid valves.
The inputs and outputs are apparently analogue (voltage) signals rather than eg frequencies or digital data.
Source:
Therefore; intercept the value from the height control sensors, and add / remove a fudge factor This should make the system think the car is at different height and adjust.
Eg if suspension switch is high, increase values at sensor by x
The principle would be the same as manually adjusting the height by using the fine-tuning rod at each corner of the vehicle. Ie confirm what that rod controls (eg a resistor to adjust voltage?) and the emulate / modify that value as input to the ECU,which will then adjust the car height accordingly.
To ensure there is minimal side effect on the system as designed by Toyota, only allow this to work when vehicle is stationery / low speed / height switch is on high? (All those inputs are also provided in the wiring to suspension ECU).