Technicals of ICEs

[AeonBlaire]

Technical question:
Ano ba nangyayari pag apak mo ng accelerator pedal?

A. You invoke a mechanism that forces more fuel (and air) into the engine.
A.1 Gradual increase
A.2 Almost instant increase

B. The accelerator pedal is actually hooked to a mechanism that limits the rev of the engine, kasi by my intuition, ICE's tend to increase the rpm even the initial feed of fuel and air is low.

C. The accelerator pedal is actually hooked to a mechanism that limits the maximum amount of fuel and air that can be pumped by the engine.

D. Something else.

[meledson]

Akala ko In Car Entertainment.

[Dr.Kamiya]

Before you can have in-car entertainment, you had to have the internal combustion engine. =D

The accelerator more or less synonymous with throttle. Throttle governs the amount of air, and by a function of that fuel that is let into the engine. Yung revs etc. etc. are just a by-product of this.

Case A is more or less correct, pero instead of the amount of air being a function of the fuel you let in, it's the reverse. The amount of fuel is a function of the amount of air you let into the engine. Conversely, C is also correct. Since the accelerator governs the throttle, stepping off the accelerator also closes the throttle, meaning you stop/limit air, and therefore fuel from entering the engine.

Before the days of electronic fuel-injection, the amount of fuel is more or less linearly related to the amount of air, both being fed into the carbuerator. Because of this linear relationship, old carb cars are often run rich for safety, kaya pag dating sa high-altitude environment (i.e. baguio) minsan nalulunod sa gas.

These days, the amount of fuel needed is calculated by the ECU, by sensing the amount of air coming into the engine via a MAF (mass airflow sensor) or MAP (mass air pressure sensor).

Yun lang po! Basta to summarize: at the very basic level, the accelerator controls the amount of AIR coming into the engine, tapos yung ECU or carb mo na ang bahala sa amount of fuel. More air = more power = more revs. Lahat na ng succeeding driving characteristics ng engine madederive mo dito.

[alwayz_yummy]

yup--kaya di ako sumabat,e...no subz and amps here

ICE on topic = internal combustion engine, isa sa mga major ko to,e..

teka ha.. tanda ko letter A sagot....

[AeonBlaire]

Thanks.
I meant A and C to be different, so based on Dr. Kamiya's explanation, C is the answer. Now please let me follow-up and expand.

The amount of pressing on the accelerator pedal (how much you press it)

A. Translates to how fast the engine revs to full rev (and increases torque?), so essentially "ICE's tend to increase the rpm even the initial feed of fuel and air is low."

B. Dictates at what rpm (and torque) the engine stays, and stays that way.
B.1 The carburetor/ECU regulates (up and down cycle) air/fuel intake so that the engine stays at that rpm (and torque).

C. Both actually, translates to how fast the engine revs (and increase torque) to the limit dictated, and the air/fuel intake is regulated (up and down cycle) so that the engine stays at that rpm (and torque).
C.1 Only ECUs can do this.
C.2 Only carburetors can do this.
C.3 Both ECUs and carburetors can do this.

Kasi when the clutch is engaged the tendency is to eventually stop the revolution, due to friction. Thats why sometimes you need to rev the engine first before engaging the clutch, so that the engine has a headstart against the incoming friction, tama ba?

Arrgh when pondering on this topic, it tends to be complicated, kasi may mga issues na lalabas, kaya ung modern vehicles ay dapat talaga ECU.

[4JGtootsie]

ICE is the engine as a whole. I just get the impression the ICE is just a part of an engine. The fuel system, air induction and advance mechanism (vacuum, electronics,etc) facilitate the increase in engine speed.

The engine should maintain speed (atleast minimum capacity) even if the clutch starts to engage. The sudden load to the engine is obsorbed/desipated by the flywheel, pressure plate and torque converter.

In diesels which is also an internal combustion engine, the pistons, cylinder and turbo acts as an air pump. The increase in fuel injected at an ideal compression ratio will increase engine speed therefore increasing air pumping capabilities.