Skip to main content

Glossary: P

PART-TIME FOUR-WHEEL DRIVE

Part-time four-wheel drive is the most common type of all wheel drive. It usually operates only in two-wheel drive mode and it can be switched to all-wheel drive whenever the situation requires.

By employing a center differential or a transfer box, these types of all-wheel drive systems can transfer power to either the front only, rear or to all the drive wheels, depending on the driver's wishes.

On older designs, the all-wheel drive mode had to be manually engaged and the vehicle had to be stopped in order for the (usually front) wheel hubs to be locked, but it can now be done from the inside of the vehicle and on some vehicles even while they're moving.
Permanent Four-Wheel drive

PERMANENT FOUR-WHEEL DRIVE

Permanent four-wheel drive systems send power to all four wheels in a continuous manner. There is no need for the driver to engage two or four-wheels drive mode, since all of the wheels are always powered. Power curve (powerband)

POWER CURVE

The power output of an internal combustion engine forms a curve if charted on a graph, since the engine has different outputs at different rpms. This is called the power curve, or powerband. The power curve can be more abrupt, or relatively flat, depending on the power output along the rev range.
Power steering

POWER STEERING

Power steering was developed in order to reduce the effort needed to steer the vehicle. In other words, the driver can change the vehicle's direction with the help of an external power source that can assist this operation.

Most power steering systems employ hydraulic pressure and are operated using power from the engine, but in recent years, electro-hydraulic and even 100% electric systems have been introduced.

Some modern steering systems can provide a variable amount of assist, depending on the speeds at which the vehicle is moving, while others are even using the "drive-by-wire" technology, with no direct linkage between the steering wheel and the the wheels. Power Train Electronic Control

PTEC

The Power Train Electronic Control (PTEC) is the Aston Martin moniker for a system which controls the engine management, fuel-injection, ignition and other diagnostics. Employing a central ECU, the PTEC technology is capable of transmitting information between different electronic elements in the engine in microseconds. Push-Button Four-Wheel Drive

PUSH-BUTTON FOUR-WHEEL DRIVE

In some modern part-time four-wheel drive systems the "all-wheel drive mode" can be engaged electronically by simply pushing a button somewhere on the instrument panel, thus relieving the driver of locking the wheel hubs manually. Pushrods (or rods)

PUSHRODS

Pushrods are found only in OHV (Overhead Valve) engines. Essentially, they are metallic rods which are actuated by the camshaft in order to operate (open and close) via rocker arms the intake and exhaust valves.

Popular posts from this blog

Chevrolet’s 2019 Mid-Engine Corvettes caught in spy mode heading South i...

Zukunftsaussicht: Corvette C8 (2019) Details/Erlkärung

Ferrari 488 Pista 2019 review - 710bhp supercar on road and track

24 Hours of Le Mans 2018 Live - Qualifying // Session 2 & 3

Das ist (die Neue) BMW 8 (G17). Well...?

Like? Unlike? Unlike the concept, this is...

Les meilleurs spots du circuit des 24 Heures du Mans !

2018 Chevy Silverado - Battle Scars: Chevy Commercial | Chevrolet

IF Clause | Mercedes-Maybach Coupe

2017 new BMW Motorrad Vision Next 100 features promo video

Toyota GR Super Sport concept

previously on GR Super Sport Concept
Today TOYOTA GAZOO Racing (TGR) unveiled the GR Super Sport Concept at the 86th edition of the 24 Hours of Le Mans.
First revealed at the 2018 Tokyo Auto Salon in January, this next-generation hyper car incorporates hybrid electric technology honed through Toyota's participation in the FIA World Endurance Championship (WEC).
Meanwhile, the development of Toyota's next generation of super sports car has started. It takes the cutting-edge hybrid electric systems and fuel economy technology that the TGR WEC team has tested and refined during the past six years in WEC, and showcases them in one superb package.
The GR Super Sport Concept is powered by a V6 twin turbocharger and the Toyota Hybrid System-Racing (THS-R), delivering a combined output of 1,000 DIN hp, which it shares with the TS050 Hybrid LMP1 race car.
Shigeki Tomoyama, President of GAZOO Racing Company, said: "Competing in the World Endurance Championship -one of the most deman…