Electronic Gear Selector / Electronic Gear-shift

**honza** · September 18th, 2017 01:38 AM

Originally Posted by yebo

question on electronic parking brake. can you apply it when the vehicle is in motion and tranny is in gear? kasi one function of the hand brake is also to act as an emergency brake. kung hindi mag-engage ang electronic parking brake e di hindi siya pwedeng emergency brake?

Good question. I'd be interested to know the answer too.

**oj88** · September 18th, 2017 06:49 AM

Electronic parking brake behvior while moving probably depends on the make and model of the vehicle.

What Happens If You Pull The Electronic Parking Brake WHILE driving ? - YouTube

**Walter** · September 18th, 2017 10:41 AM

Originally Posted by oj88

About the only primary analog controls you have left in a car are the steering, accel. pedal and the brakes.

Power steering these days are electronic ... accelerator pedal has been electronic for a decade already ... these are not physically connected anymore ... they are drive by wire ...

Mercedes Benz tried electronic braking system on the W211 E-class but consumers did not like it and reverted back to analog during the facelift of W211 model ...

**Walter** · September 18th, 2017 10:43 AM

Originally Posted by yebo

question on electronic parking brake. can you apply it when the vehicle is in motion and tranny is in gear? kasi one function of the hand brake is also to act as an emergency brake. kung hindi mag-engage ang electronic parking brake e di hindi siya pwedeng emergency brake?

Some cars have fail safe ... but mechanical is still faster during emergency situations ... and stunt driving ...

**oj88** · September 18th, 2017 11:02 AM

Originally Posted by Walter

Power steering these days are electronic ... accelerator pedal has been electronic for a decade already ... these are not physically connected anymore ... they are drive by wire ...

Mercedes Benz tried electronic braking system on the W211 E-class but consumers did not like it and reverted back to analog during the facelift of W211 model ...

I agree with you, but that's not the point I'm making.

Yes, we have electronic steering assist and drive-by-wire accel pedal.... but they're still analog. Obviously, you can't have a steering system that can only do full left, right, and center. Same with the accel and brake pedals. They're not simple ON and OFF switches.

As opposed to shifting... where gear selection is fixed. Even cars with CVTs, the driver does not have override control over the gears.... if it has 7 forward gears, you can select 1 to 7, but not 1.5, 3.8, or some other odd gear ratios that, in reality, the CVT could probably do in "D".

Same deal with electronic parking brakes... it's either ON (engaged) or OFF (disengaged). How often have ordinary people actually used their parking/e-brakes in an actual emergency? And wouldn't you think that activating a button is easier for everyone than tugging on a traditional lever, where locking the rear tires is possible? Not everyone drifts.

**yapoy86** · September 18th, 2017 11:46 AM

Originally Posted by Walter

Power steering these days are electronic ... accelerator pedal has been electronic for a decade already ... these are not physically connected anymore ... they are drive by wire ...

Mercedes Benz tried electronic braking system on the W211 E-class but consumers did not like it and reverted back to analog during the facelift of W211 model ...

Analog pa din ang steering.. yung assist lang nya ang electronic.. yung accelerator pedal ang not physically connected.. kaya may delay yan ng konti

**oj88** · September 18th, 2017 12:02 PM

Originally Posted by yapoy86

Analog pa din ang steering.. yung assist lang nya ang electronic.. yung accelerator pedal ang not physically connected.. kaya may delay yan ng konti

Actually, instantaneous ang response ng drive-by-wire. Any inherent delays are designed and controlled by the ECM (ie. "rev-hang"), depending on the current driving conditions.

The pedal-to-throttle ratio is not always 1:1. This is very prominent sa A/T with drive-by-wire. If you put the pedal to the metal while in D, you will notice that the engine rev will "hang" near where the next shift point is, giving you a smoother transition to the next gear with little shift-shock and engine still within its powerband.

Kung 1:1 yun and you take off at WOT, you will experience a lot of shift-shock and hindi magtatagal yung A/T.

**Vodka** · September 18th, 2017 12:11 PM

i think people are confused w/ electric vs electronic. analog vs digital

electric refers to things moved by electricity. e.g. electric power steering is assisted by electric motors. which is controlled by a bunch of electronics. that's the crucial distinction here. that's why you shouldn't say electronic power steering

as for drive by wire accel pedal it's actually digital. the pedal position sensor encodes and communicates the position as well as a whole bunch of checksums, error-correction, etc. it's not safe to transmit this as an analog signal, interference would cause SUA-like disasters

but that's not to say digital systems don't go SUA coz they do if they're buggy LOL

**oj88** · September 18th, 2017 12:18 PM

Semantics lang... electric/electronic power steering means the same thing. It's essentially a giant servo/stepper motor... which is controlled electronically... to provide just the right amount of torque.

And sa accel pedal... Yes, it is digital under the skin, but the manner in which it is operated is analog. Again, semantics na lang. An analogy (no pun intended) is digital music. Yes, the music is encoded digitally, but when you listen to it, it's analog.