Conjunto lógico do sensor do eixo traseiro FAW: Uma análise crítica de 4 Componentes principais ABS/TCS

Bem-vindo a este guia técnico crítico sobre o Conjunto lógico do sensor do eixo traseiro FAW (Conjunto 555). Este é o completo, high-precision “wheel speed sensing” sistema para os *eixos motrizes* traseiros do FAW Jiefang CA4251P66K24T1A3E5 6×4 trator semirreboque diesel. Esta montagem é a principal “eyes and ears” for the vehicle’s Anti-lock Braking System (Abs) and Traction Control System (TCS).

O Conjunto lógico do sensor do eixo traseiro FAW is a set of components with one vital “lógica” função: to precisely measure the rotational speed of each rear drive wheel and report it, in real-time, to the truck’s main ECU and ABS computer. This data is the foundation of all modern active safety systems on the 6×4 trator.

This in-depth guide is an essential resource for professional diesel technicians and parts specialists. Vamos desconstruir todo Conjunto lógico do sensor do eixo traseiro FAW em seu 4 core serviceable components: the ‘Wheel speed sensor’ (3605360-A6T-S), the ‘Sensor bracket’ (3550117A377-S), the ‘Sensor sleeve’ (3550361-6S), and the ‘Wire guide bushing’ (3605221-A6T-S). A failure in this Conjunto lógico do sensor do eixo traseiro FAW can compromise the truck’s safety and braking performance.

O “Lógica” of ABS and Traction Control (TCS)

O Conjunto lógico do sensor do eixo traseiro FAW is the sensory input for the truck’s most critical active safety systems. Isso é “lógica” is not mechanical, but electronic. It answers one question, hundreds of times per second: “How fast is this wheel turning?” This data is essential for both the Anti-lock Braking System (Abs) and the Traction Control System (TCS).

**Anti-lock Braking (Abs) Lógica:** When a driver performs a “panic stop” on a wet or icy road, the immense force from the brake chambers can “trancar” the drive wheels. A locked wheel has zero traction and can cause a dangerous “jackknife” situation. O Conjunto lógico do sensor do eixo traseiro FAW prevents this. The moment a sensor (3605360-A6T-S) reports a wheel speed of “zero” (a lock-up), the ABS computer instantly commands the brake solenoid (veja Montagem 539/545) to release and re-apply the brake on that specific wheel, “pumping” it far faster than any human. Esse “antibloqueio” logic keeps the wheel *just* on the verge of locking, providing maximum stopping power while maintaining stability.

**Traction Control (TCS) Lógica:** This same Conjunto lógico do sensor do eixo traseiro FAW provides the “lógica” for acceleration. If the 6×4 tractor is on a split-traction surface (Por exemplo, one wheel on ice, one on pavement) and the driver accelerates, the wheel on the ice will spin uselessly, wasting power. The ECU sees this “spin-up” (one wheel spinning much faster than the others) via the sensor signal. It then can automatically apply a small amount of brake to *just that wheel* (or cut engine power). Esse “lógica” fools the axle’s differential into sending torque to the wheel that *does* have traction, allowing the truck to move. This entire safety net is built on the data provided by the Conjunto lógico do sensor do eixo traseiro FAW.

Componente principal 1: ‘Wheel Speed Sensor’ (3605360-A6T-S)

The star of the Conjunto lógico do sensor do eixo traseiro FAW is the ‘Wheel speed sensor’ (3605360-A6T-S). A lista de peças pede dois, one for each side of the drive axle. Este é o eletrônico “escolher” that generates the speed signal.

This is typically a “Hall-effect” ou “magnetic reluctance” sensor. Isso é “lógica” is to detect magnetic fields. It is mounted via the ‘Sensor bracket’ (3550117A377-S) so that its tip is positioned a fraction of a millimeter away from the ‘ABS ring’ (a “anel de tom” with teeth, which is part of the wheel hub assembly, veja Montagem 524/525).

As the wheel hub spins, the teeth of the ABS ring fly past the sensor’s tip. Each “tooth” e “brecha” creates a “pulse” in the magnetic field. The sensor reads these pulses and sends them as a digital signal (a “square wave”) to the ECU. The *frequency* of these pulses is directly proportional to the wheel’s speed. The ECU counts these pulses and knows, with pinpoint accuracy, how fast the wheel is turning.

This is the most common failure point in the Conjunto lógico do sensor do eixo traseiro FAW. The sensor itself is a sealed electronic unit, but it lives in a hostile environment. It can be damaged by:

• **Debris:** A buildup of brake dust and metallic “fuzz” from the brake drum on the magnetic tip can block the signal.
• **Dano:** A rock or road debris can strike the sensor or its wiring, breaking the circuit.
• **Air Gap:** If the ‘Sensor bracket’ (3550117A377-S) is bent or corroded, o “air gap” between the sensor and the ring will be too large, resulting in a weak or non-existent signal.

A failure of this sensor will immediately trigger an ABS warning light on the dashboard and disable both the ABS and traction control systems, reverting the truck to standard, non-logic braking. Um defeito Conjunto lógico do sensor do eixo traseiro FAW is a critical safety issue.

Componente principal 2: O sistema de montagem (Suporte & Manga)

The ‘Sensor bracket’ (3550117A377-S) and ‘Sensor sleeve’ (3550361-6S) são os “Bracket Logic” parte do Conjunto lógico do sensor do eixo traseiro FAW.

**’Sensor bracket’ (3550117A377-S):** This is far more than a simple bracket; it is a **precision alignment device**. Isso é “lógica” is to hold the ‘Wheel speed sensor’ in the *exact* correct position and at the *exact* correct angle relative to the ABS tone ring. O “air gap” (the distance between the sensor tip and the ring’s teeth) is the most critical tolerance in the entire Conjunto lógico do sensor do eixo traseiro FAW.

* **If the gap is too large,** the magnetic pulse from the passing teeth will be too weak for the sensor to read, resultando em um “no signal” fault. * **If the gap is too small,** the spinning ABS ring (which can have a tiny “oscilar” ou “acabar”) can strike the sensor tip, destroying it.

**’Sensor sleeve’ (3550361-6S):** Este componente “lógica” is one of protection and precise fit. Esse “sleeve” is a bushing, typically made of a non-corroding material like bronze, brass, or a high-temperature polymer. The ‘Wheel speed sensor’ is inserted *through* this sleeve, which is itself pressed into the ‘Sensor bracket’. This prevents the sensor body (plastic/aluminum) from corroding and “seizing” to the steel or iron bracket, garantindo o Conjunto lógico do sensor do eixo traseiro FAW can be serviced.

Componente principal 3: ‘Wire Guide Bushing’ (3605221-A6T-S)

The final component of the Conjunto lógico do sensor do eixo traseiro FAW is the ‘Wheel speed sensor wire guide bushing’ (3605221-A6T-S). This simple-looking part is a critical “lógica” component for reliability.

The sensor wire must run from the wheel-end, along the axle housing, and up to the chassis frame harness. This entire path is a “hostile environment” full of heat (from the brakes and differential), vibração, and flying road debris (rocks, ice, etc.).

Esse “guide bushing” is a specialized, high-temperature rubber or polymer grommet. It is used to safely pass the wire through a hole in a chassis bracket. Isso é “lógica” is to prevent **chafing**. Without this bushing, the sharp, metal edge of the bracket hole would, under constant vibration, rub through the wire’s insulation. This would cause a short-circuit, grounding out the sensor signal and disabling the ABS. This simple bushing is the “armor” that protects the “sistema nervoso” do Conjunto lógico do sensor do eixo traseiro FAW.

FAW Rear Axle Sensor Logic Assembly Parts List

A tabela a seguir fornece o completo, detalhamento de todos 4 components identified in the ‘Rear Axle Sensor Logic Assembly’ (555) diagrama para o trator FAW CA4251P66K24T1A3E5.

Especificações Técnicas e Contexto de Montagem

As especificações para o Conjunto lógico do sensor do eixo traseiro FAW are defined by its function as the primary data-gathering tool for the vehicle’s active safety systems. O Conjunto lógico do sensor do eixo traseiro FAW is a high-precision, safety-critical system.