Go Back   Team-BHP > Under the Hood > Technical Stuff


Reply
 
Thread Tools Search this Thread
Old 17th October 2006, 19:26   #1
BHPian
 
Join Date: Feb 2006
Location: Pune
Posts: 487
Thanked: 110 Times
Default Central locking versus remote locking

Would like to know more about what the difference\similarity is between remote & central locking mechanisms!!! I will be taking delivery of a 1.2 ELX Palio next week, & it has central locking as a standard fitment, but I just dint know enough to differentiate between the two systems.
mb_jg is offline   Reply With Quote
Old 17th October 2006, 20:44   #2
Senior - BHPian
 
gd1418's Avatar
 
Join Date: May 2006
Location: Gurgaon
Posts: 3,578
Thanked: 655 Times
Default

As I understand and was told when I got my Safari 4x4 in 1998, the central locking means if you lock the door of the driver side by the key from outside or from inside then all the four doors and the boot door gets locked. And inversely if you open then all doors open.

Remote locking is a bit advanced version of this wherein you don't have to turn the key to lock or unlock. In this a small console is fitted inside the car and you get a remote key chain with buttons for locking and uncloking. You press the button for locking and the all the doors lock and similarly unlock as well. It works on infrared principle if I am not wrong and operates comfortable from a distance of 100 meters.

Quote:
Originally Posted by mb_jg
Would like to know more about what the difference\similarity is between remote & central locking mechanisms!!! I will be taking delivery of a 1.2 ELX Palio next week, & it has central locking as a standard fitment, but I just dint know enough to differentiate between the two systems.
gd1418 is offline   Reply With Quote
Old 17th October 2006, 20:57   #3
DRC
BHPian
 
DRC's Avatar
 
Join Date: Dec 2004
Location: Cockpit
Posts: 907
Thanked: 42 Times
Default

What ever GD1418 mentioned is correct and with a small correction, It works on Radio frequency 27 MHz (official keyless entry frequency)

Also, in a car with central locking feature, the fitment is easy by wiring this console only to the driver's door lock solenoid, otherwise you have to install solenoids on all the door locks.
DRC is offline   (1) Thanks Reply With Quote
Old 17th October 2006, 21:00   #4
Senior - BHPian
 
gd1418's Avatar
 
Join Date: May 2006
Location: Gurgaon
Posts: 3,578
Thanked: 655 Times
Default

Thanks DRC for correcting and enlightening..much appreciated.

Quote:
Originally Posted by DRC
What ever GD1418 mentioned is correct and with a small correction, It works on Radio frequency 27 MHz (official keyless entry frequency)

Also, in a car with central locking feature, the fitment is easy by wiring this console only to the driver's door lock solenoid, otherwise you have to install solenoids on all the door locks.
gd1418 is offline   Reply With Quote
Old 17th October 2006, 21:38   #5
Ram
Senior - BHPian
 
Ram's Avatar
 
Join Date: Dec 2005
Location: Singapore, Mumbai, Nagpur
Posts: 2,165
Thanked: 144 Times
Default

The Daewoo Cielo/Nexia had central locking system without a radio remote control.

Central locking
The two rear doors and the front passenger door
had electric motor-driven rack-and-pinion actuators (not mere solenoids) on their doorlock rods.

Each actuator consisted of an electric motor turning a pinion that wound up or down a rack, locking or unlocking its own door alone.

The driver's door had no motor-driven rack-and-pinion actuator -- only a simple SPDT (single-pole-double-throw) switch to activate or reverse the other three doorlock motors.

Remote locking
To enhance this set-up to remote locking, you had to add a motorized rack and pinion actuator for the driver's doorlock rod too.

This actuator would be energized by power-transistors driven by the radio receiver circuit.

Aftermarket suppliers like Autocop provided
  1. the radio transmitter
  2. receiving circuit plus
  3. this additional actuator for the driver's door.
By radio-controlling the driver's door rack-n-pinion actuator, you could lock/unlock all passenger cabin doors.

Hope this clarifies the difference between central locking and remote locking.

Postscript
Inspired by Daimler-Benz’s “Keyless Go” product on the 2000 Mercedes S-class, I had wired my Daewoo Nexia with a Philips "Mifare" contactless SmartCard reader instead of the Autocop analog radio circuits. With the Schlumberger contactless smart-cards, I could separately unlock the passenger cabin and the trunk of my Nexia. Being able to remotely pop-open the trunk was a great convenience.

The idea was to have a contactless SmartCard peripheral interfaced to an in-car embedded computer to automatically secure the car. Back in 2000, my prototype could autonomously wind-up and wind-down the windows and control the central locking system of my new 2000 model Daewoo Nexia.

My current Baleno VXi has a mechanical cable-release for the trunk, instead of the Cielo/Nexia's electric release, so it's a little more complex to remotely unlock the trunk.

Ram

--------------------------------------------------------------------------------
Off topic:
I used a Philips MiFare ISO 14443A contactless SmartCard peripheral. It fit beautifully into an autorickshaw taillamp lens which I used as the casing. The assembly was fixed on the rear parcel shelf, flush with the rear quarter window.

The main Atmel microcontroller based motherboard was mounted in a polypropylene bread-box in the trunk.

A Schlumberger contactless smart-card presented within five inches of the rear quarter window from outside, unlocked the car and disabled the ignition immobilizer. My carputer also recorded timestamps of when the car was last used. Had to replace the driver's doorlock inside lever, with a motorized one from Autocop.

Used another Schlumberger contactless smart-card with a different digital signature-id to unlock the Nexia's trunk.

The system would also automatically windup the windows and lock the car, if the car was left unsecured for some (programmable amount of) time. One early issue that bugged me, was that after 8-hours in the hot sun, the car's battery voltage would drop below the design 11.5 V.

In summary, it was a hugely successful project, but SmartCard peripheral costs in 2000-2001 prevented me from making it a viable commercial product for India.

Last edited by Ram : 17th October 2006 at 21:46.
Ram is offline   (1) Thanks Reply With Quote
Old 17th October 2006, 21:51   #6
Senior - BHPian
 
gd1418's Avatar
 
Join Date: May 2006
Location: Gurgaon
Posts: 3,578
Thanked: 655 Times
Default

Very very interesting. That was then in 2000-01. what about now?

Quote:
Originally Posted by ram
--------------------------------------------------------------------------------
Off topic:
I used a Philips MiFare ISO 14443A contactless SmartCard peripheral. It fit beautifully into an autorickshaw taillamp lens which I used as the casing. The assembly was fixed on the rear parcel shelf, flush with the rear quarter window.

The main Atmel microcontroller based motherboard was mounted in a polypropylene bread-box in the trunk.

A Schlumberger contactless smart-card presented within five inches of the rear quarter window from outside, unlocked the car and disabled the ignition immobilizer. My carputer also recorded timestamps of when the car was last used. Had to replace the driver's doorlock inside lever, with a motorized one from Autocop.

Used another Schlumberger contactless smart-card with a different digital signature-id to unlock the Nexia's trunk.

The system would also automatically windup the windows and lock the car, if the car was left unsecured for some (programmable amount of) time. One early issue that bugged me, was that after 8-hours in the hot sun, the car's battery voltage would drop below the design 11.5 V.

In summary, it was a hugely successful project, but SmartCard peripheral costs in 2000-2001 prevented me from making it a viable commercial product for India.
gd1418 is offline   Reply With Quote
Old 18th October 2006, 13:06   #7
Senior - BHPian
 
esteem_lover's Avatar
 
Join Date: Jul 2006
Location: Madras/Py
Posts: 7,554
Thanked: 445 Times
Default

surprising that no one mentioned the alarm system that comes with the remote locking system. After the car has been locked using the remote, it can be re-opened only with the remote. if a miscreant tries to open the car with a key, then all hell will break loose. or even if he gains entry into the car & tries to start, there are alarms that go off & some even have engine immobilisers.
esteem_lover is offline   Reply With Quote
Old 11th November 2006, 04:38   #8
BHPian
 
ankitahuja's Avatar
 
Join Date: Oct 2006
Location: Gurgaon & Delhi
Posts: 887
Thanked: 46 Times
Default A bit offtopic

An comment.

Recently there were emails going around that you can open your remote locked car via a cell phone and spare remote located anywhere if you've lost the keys or something. Well, its true.

All you need to do is take the call on your cell phone, let the other person put the remote to their cell and press the unlock button. Your cell needs to be near your front door / hood. It Pops open!

Its tried and tested! A very neat and handy way to get out of the lost-key situations!
ankitahuja is offline   Reply With Quote
Old 12th January 2007, 21:05   #9
Senior - BHPian
 
rr_zen's Avatar
 
Join Date: Sep 2006
Location: Chennai, India
Posts: 1,711
Thanked: 262 Times
Default

Quote:
Originally Posted by ankitahuja View Post
An comment.

Recently there were emails going around that you can open your remote locked car via a cell phone and spare remote located anywhere if you've lost the keys or something. Well, its true.

All you need to do is take the call on your cell phone, let the other person put the remote to their cell and press the unlock button. Your cell needs to be near your front door / hood. It Pops open!

Its tried and tested! A very neat and handy way to get out of the lost-key situations!
Yes. It is indeed true. One of my friends tried it out on his car and it really worked !
rr_zen is offline   Reply With Quote
Old 12th January 2007, 21:24   #10
BHPian
 
Join Date: Mar 2006
Location: Hyd
Posts: 252
Thanked: 19 Times
Default

did work here as well. But something which i dont like remote lockin system as ive read in the newspapers quiet some time ago that family got burned up in the car itself while trying to unlock. the car wouldnt unlock at all and they even tried to break the glass but was too late.... i rather prefer central lock ....... no offence to any remote locking system users here.
nosfreak is offline   Reply With Quote
Old 13th January 2007, 23:36   #11
Senior - BHPian
 
gd1418's Avatar
 
Join Date: May 2006
Location: Gurgaon
Posts: 3,578
Thanked: 655 Times
Default

Even if the car is remote locked and you are inside, the doors can still be opened by shifting the lock button to unlock position. The only minus point would be that by opening in such mode the alarm would go off. But who cares if your life is at stake!!!

Secondly, while sitting inside if the car catches fire, the sheer terror clouds the brain and in the panic nothing seems to work.. In Benares in the parking of Taj Ganges I parked my esteem and got out and locked it with remote lock forgetting that my wife too was sitting in. When she tried to open the door, it wouldn't and she panicked and started screaming and banging the windows. All she could have done was to roll down the windows as they were not power windows and called me. Fortunately the parking guard saw her and alerted me and I opened the car.

My point is that prescence of mind is very important in dicey situations..

Quote:
Originally Posted by nosfreak View Post
did work here as well. But something which i dont like remote lockin system as ive read in the newspapers quiet some time ago that family got burned up in the car itself while trying to unlock. the car wouldnt unlock at all and they even tried to break the glass but was too late.... i rather prefer central lock ....... no offence to any remote locking system users here.
gd1418 is offline   Reply With Quote
Old 14th January 2007, 20:30   #12
BHPian
 
theexister's Avatar
 
Join Date: Aug 2006
Location: Hyderabad...now moved to Bangalore
Posts: 172
Thanked: 4 Times
Default

Quote:
Originally Posted by gd1418 View Post
Even if the car is remote locked and you are inside, the doors can still be opened by shifting the lock button to unlock position. The only minus point would be that by opening in such mode the alarm would go off. But who cares if your life is at stake!!!

Secondly, while sitting inside if the car catches fire, the sheer terror clouds the brain and in the panic nothing seems to work.. In Benares in the parking of Taj Ganges I parked my esteem and got out and locked it with remote lock forgetting that my wife too was sitting in. When she tried to open the door, it wouldn't and she panicked and started screaming and banging the windows. All she could have done was to roll down the windows as they were not power windows and called me. Fortunately the parking guard saw her and alerted me and I opened the car.

My point is that prescence of mind is very important in dicey situations..
OT but I dare to imagine what consequences this had considering it was your wife!
theexister is offline   Reply With Quote
Old 15th January 2007, 07:32   #13
Senior - BHPian
 
gd1418's Avatar
 
Join Date: May 2006
Location: Gurgaon
Posts: 3,578
Thanked: 655 Times
Default

Ah..! the consequences...Can't write them here....To relive that itself is a nightmare...(and my wife is not reading this)....

Quote:
Originally Posted by theexister View Post
OT but I dare to imagine what consequences this had considering it was your wife!
gd1418 is offline   Reply With Quote
Old 15th January 2007, 08:19   #14
Senior - BHPian
 
esteem_lover's Avatar
 
Join Date: Jul 2006
Location: Madras/Py
Posts: 7,554
Thanked: 445 Times
Default

Quote:
Originally Posted by gd1418 View Post
In Benares in the parking of Taj Ganges I parked my esteem and got out and locked it with remote lock forgetting that my wife too was sitting in. When she tried to open the door, it wouldn't and she panicked and started screaming and banging the windows. All she could have done was to roll down the windows as they were not power windows and called me. Fortunately the parking guard saw her and alerted me and I opened the car.

My point is that prescence of mind is very important in dicey situations..
man, i hope you had the presence of mind after getting yourself into that dicey situation !
BTW, did you know that there are better ways of getting rid of your wife ??
esteem_lover is offline   Reply With Quote
Old 15th January 2007, 12:54   #15
BHPian
 
nkapoor777's Avatar
 
Join Date: Nov 2006
Location: New Delhi
Posts: 583
Thanked: 87 Times
Default

man gd1418, you got some guts to do that to your wife....
nkapoor777 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
central locking remote not working silver_shadow Technical Stuff 12 3rd November 2011 07:07
Alto Xcite - Upgrade Manual Central Locking to Remote Central locking Laxminarayan Technical Stuff 1 28th December 2009 15:02
Which Central Locking with keyless entry and remote boot opener sabret00the Technical Stuff 6 27th April 2009 16:18
Remote Central Locking for Swift Melody Modifications & Accessories 54 26th November 2008 23:41
Is Remote Central Locking not possible in a Palio ? YsableKid Modifications & Accessories 16 12th January 2007 01:12


All times are GMT +5.5. The time now is 11:12.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks