jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Power Window Relay
Personally, I would prefer to have time to operate the windows after the key is removed from the ignition.
There is also an option to have the windows go up automatically as soon as you remove the key and this is the way some guys got it set-up with the upgraded aftermarket alarm kits, except with the upgraded alarm modules they have the option to arm the alarm for the windows to go up (meaning when you're out of the car and about to lock it)
Jaycar does sell the windows auto wind-up modules and I think they cost about $50 each from memory.
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3/Nov/2006, 3:45 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Power Window Relay
Nath,
Based on what we talked about today in regards to building the time delay circuit ourselves, I have done some research and found this set-up. Let me know if it's close to what you already have in hand.
Power-Off Time Delay Relay
The two circuits below illustrate opening a relay contact a short time after the ignition or light switch is turned off. The capacitor is charged and the relay is closed when the voltage at the diode anode rises to +12 volts. The circuit on the left is a common collector or emitter follower and has the advantage of one less part since a resistor is not needed in series with the transistor base. However the voltage across the relay coil will be two diode drops less than the supply voltage, or about 11 volts for a 12.5 volt input. The common emitter configuration on the right offers the advantage of the full supply voltage across the load for most of the delay time, which makes the relay pull-in and drop-out voltages less of a concern but requires an extra resistor in series with transistor base. The common emitter (circuit on the right) is the better circuit since the series base resistor can be selected to obtain the desired delay time whereas the capacitor must be selected for the common collector (or an additional resistor used in parallel with the capacitor). The time delay for the common emitter will be approximately 3 time constants or 3*R*C. The capacitor/resistor values can be worked out from the relay coil current and transistor gain. For example a 120 ohm relay coil will draw 100 mA at 12 volts and assumming a transistor gain of 30, the base current will be 100/30 = 3 mA. The voltage across the resistor will be the supply voltage minus two diode drops or 12-1.4 = 10.6. The resistor value will be the voltage/current = 10.6/0.003 = 3533 or about 3.6K. The capacitor value for a 15 second delay will be 15/3R = 1327 uF. We can use a standard 1000 uF capacitor and increase the resistor proportionally to get 15 seconds.
Last edited by jalalski, 6/Nov/2006, 8:06 am
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4/Nov/2006, 5:04 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Power Window Relay
Guys,
I think I found the solution that will not only be possible for the xtrail, but any other car that has central locking and power windows
Automatic Window Closer
The system I found can do this as quoted by the manufacturer:
quote:
Features:
* Strong practicality. The perambulate device will automatically check and declare the state of windows after driver gets off and locks the door. Function as theft-proof, water-proof.
* Automatically protective function: power supply will be automatically shut down in case of motor, door or window stuck, and the system will skip to the next window and work, so that it protects the power window system.
* Broad scope of application: It can be installed on a car even without alarms or central lock.
I am in the process of obtaining pricing on this system.
Last edited by jalalski, 6/Nov/2006, 2:56 pm
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6/Nov/2006, 12:08 pm
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jalalski
Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29100
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Re: Power Window Relay
Good stuff Nath. I'll await the results of your experiment and hopefully by that time, I will have pricing on the ready made set-up, but I doubt it'll beat the estimated price you mentioned for the DIY option
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6/Nov/2006, 8:00 pm
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