Multifunction Display Question about "Charge"
10-27-2016, 10:48 AM
#1
Multifunction Display Question about "Charge"
Here's something I don't understand and the owner's manual gives little help. I have a 2017 RWD GLC300.
Within the multifunction display, there is a screen that shows fuel remaining range. Lower down on the screen there is a graphic display that the manual describes as a "recuperation display" with a bar graph showing current rates of fuel consumption. On the right side of the graphic display, there is a section labelled "Charge" that illuminates when braking.
If my GLC300 was a hybrid, I could understand the display, but with a gasoline engine, what could possibly be charging?
There is a drawing of this feature on page 213 of the owner's manual, but it offers no clues what this means. The manual explains:
"Recuperation display (3) shows you if energy has been recuperated from the kinetic energy in overrun mode and saved in the battery. Recuperation display (3) depends on the engine installed and is therefore not available in all vehicles."
Are they trying to say, "If this were a hybrid, you would be recovering the kinetic energy from braking instead of wasting the energy?"
(Recuperation is a strange word to use. Was the engine sick? I think of recuperation from illness.)
Within the multifunction display, there is a screen that shows fuel remaining range. Lower down on the screen there is a graphic display that the manual describes as a "recuperation display" with a bar graph showing current rates of fuel consumption. On the right side of the graphic display, there is a section labelled "Charge" that illuminates when braking.
If my GLC300 was a hybrid, I could understand the display, but with a gasoline engine, what could possibly be charging?
There is a drawing of this feature on page 213 of the owner's manual, but it offers no clues what this means. The manual explains:
"Recuperation display (3) shows you if energy has been recuperated from the kinetic energy in overrun mode and saved in the battery. Recuperation display (3) depends on the engine installed and is therefore not available in all vehicles."
Are they trying to say, "If this were a hybrid, you would be recovering the kinetic energy from braking instead of wasting the energy?"
(Recuperation is a strange word to use. Was the engine sick? I think of recuperation from illness.)
10-27-2016, 11:44 PM
#4
MBWorld Fanatic!
If the car has eco stop-start mode, it uses that time to charge the auxiliary battery during coasting. That way, the alternator isn't putting a load on the engine when it's actually using fuel to accelerate the vehicle. The vehicle will disable the alternator when possible to save energy. The deceleration time, no motive power is needed so the car can switch the alternator on to full charge mode with no extra fuel burned.
10-28-2016, 02:36 PM
#6
Junior Member
10-28-2016, 06:40 PM
#8
MBWorld Fanatic!
There is a small battery somewhere around the spare tire well (I haven't changed one in a GLC yet to say exactly where) that the SAM uses for additional power when the engine is turned off to not excessively drop voltage in the main battery all the time.
There's a TON of power management going on all the time. Relays turn on and off the charging paths to that rear battery, the alternator is switched on and off all the time, the batteries are tested for internal resistance, voltage, and temperature. It's amazing when it's all working, but it's a nightmare when it's not right.
There's a TON of power management going on all the time. Relays turn on and off the charging paths to that rear battery, the alternator is switched on and off all the time, the batteries are tested for internal resistance, voltage, and temperature. It's amazing when it's all working, but it's a nightmare when it's not right.
