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MacPherson strut suspension, track control arm coloured dark blue. In automotive suspension, a control arm, also known as an A-arm, is a hinged suspension link between the chassis and the suspension upright or hub that carries the wheel. In simple terms, it governs a wheel's vertical travel, allowing it to move up or down when driving over ...
The front suspension uses MacPherson struts with a new, more rigid control-arm design, while the rear uses a torsion beam arrangement. The spring rates on Corolla are relaxed, but the S model equipped with 17-inch wheels includes unique coil, damper, and bushing tuning to offering stiffer handling.
TEMS (Toyota Electronic Modulated Suspension) is a shock absorber that is electronically controlled (Continuous Damping Control) based on multiple factors, and was built and exclusively used by Toyota for selected products during the 1980s and 1990s (first introduced on the Toyota Soarer in 1983 [1]).
With the advent of electronic throttle control, accelerator pedals consist of a spring-loaded pedal arm connected to an electronic transducer. This transducer , typically a potentiometer or Hall effect sensor , converts the position of the pedal arm to an electronic signal which is sent to an electronic control unit (ECU).
The leading arm / trailing arm swinging arm, fore-aft linked suspension system, together with in-board front brakes, had a much smaller unsprung weight than existing coil spring or leaf designs. The interconnection transmitted some of the force deflecting a front wheel up over a bump, to push the rear wheel down on the same side.
The shock absorber and coil spring mount to the wishbones to control vertical movement. Double wishbone designs allow the engineer to carefully control the motion of the wheel throughout suspension travel, controlling such parameters as camber angle, caster angle, toe pattern, roll center height, scrub radius, scuff (mechanical abrasion), and more.