Блок логики датчика переднего моста FAW: Почему эти 3 Критические части – это “Мозг” ваших тормозов

Добро пожаловать в это важное техническое руководство по Блок логики датчика переднего моста FAW (Сборка 550). Это полный, high-precision “wheel speed sensing” system for the front steer axle of the FAW Jiefang CA4251P66K24T1A3E5 6×4 дизельный полуприцеп тягач. Эта сборка является основной “глаза и уши” for the vehicle’s Anti-lock Braking System (АБС) and traction control.

The Блок логики датчика переднего моста FAW is a set of components with one vital “логика” функция: to precisely measure the rotational speed of each front 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.

Это подробное руководство является важным ресурсом для профессиональных технических специалистов и специалистов по запчастям.. Мы разберем всю Блок логики датчика переднего моста FAW в свой 3 core serviceable components: the ‘Wheel speed sensor assembly’ (3550360-6С), the ‘Sensor seat’ (3550111Б1Х), and the ‘Sensor sleeve’ (3550361-6С). A failure in this Блок логики датчика переднего моста FAW can compromise the truck’s safety.

The “Логика”: How This Assembly Controls ABS and Traction

The Блок логики датчика переднего моста FAW is the sensory input for the truck’s most critical active safety systems. Его “логика” 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 (АБС) and the Traction Control System (TCS).

**Anti-lock Braking (АБС) Логика:** When a driver performs a “паника стоп” on a wet or icy road, the immense force from the brake chambers can “замок” the front steer wheels. A locked steer wheel has zero steering capability; the truck will simply plow straight ahead, regardless of the driver’s steering input. The Блок логики датчика переднего моста FAW предотвращает это. The moment a sensor (3550360-6С) reports a wheel speed of “ноль” (a lock-up), the ABS computer instantly commands the brake solenoid (см. сборку 539) to release and re-apply the brake on that specific wheel, “pumping” it far faster than any human. Этот “anti-lock” logic keeps the wheel *just* on the verge of locking, providing maximum stopping power while crucially allowing the driver to *steer* around the obstacle.

**Контроль тяги (TCS) Логика:** This same Блок логики датчика переднего моста FAW provides data for traction. If the truck is on a split-traction surface (НАПРИМЕР., one wheel on ice, one on pavement) and the driver accelerates, the wheel on the ice will spin uselessly. The ECU sees this “spin-up” via the sensor and can automatically apply a small amount of brake to *just that wheel*, который “fools” the differential into sending torque to the wheel that has traction. This entire safety net is built on the data provided by the Блок логики датчика переднего моста FAW.

Основной компонент 1: The ‘Wheel Speed Sensor Assembly’ (3550360-6С)

The star of the Блок логики датчика переднего моста FAW is the ‘Wheel speed sensor assembly’ (3550360-6С). В списке запчастей указано два, по одному на каждое переднее колесо. Это электронная “pickup” that generates the speed signal.

This is typically a “Hall-effect” или “magnetic reluctance” датчик. Его “логика” is to detect magnetic fields. It is mounted via the ‘Sensor seat’ (3550111Б1Х) so that its tip is positioned a fraction of a millimeter away from the ‘ABS ring’ (а “тональное кольцо” with teeth, which is part of the wheel hub assembly, см. сборку 523).

As the wheel hub spins, the teeth of the ABS ring fly past the sensor’s tip. Каждый “tooth” и “зазор” создает “пульс” in the magnetic field. The sensor reads these pulses and sends them as a digital signal (а “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.

Это наиболее распространенная точка отказа в Блок логики датчика переднего моста 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 “пух” on the magnetic tip can block the signal.
• **Повреждать:** A rock or road debris can strike the sensor or its wiring, breaking the circuit.
• **Air Gap:** If the ‘Sensor seat’ (3550111Б1Х) is bent or corroded, а “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.

Основной компонент 2: The ‘Sensor Seat’ (3550111Б1Х)

The ‘Sensor seat-front wheel brake’ (3550111Б1Х) это “кронштейн” для Блок логики датчика переднего моста FAW. В списке запчастей указано два из них.. This component is far more than a simple bracket; it is a **precision alignment device**.

Его “логика” is to hold the ‘Wheel speed sensor’ in the *exact* correct position and at the *exact* correct angle relative to the ABS tone ring. The “air gap” (the distance between the sensor tip and the ring’s teeth) is the most critical tolerance in the entire Блок логики датчика переднего моста FAW.

* **If the gap is too large,** the magnetic pulse from the passing teeth will be too weak for the sensor to read, в результате чего “no signal” fault. * **If the gap is too small,** the spinning ABS ring (which can have a tiny “колебаться” или “runout”) can strike the sensor tip, destroying it.

This ‘Sensor seat’ is bolted to the non-rotating steering knuckle (см. сборку 510). It is designed to be a rigid, un-flexing mount that can withstand the constant vibration of the wheel and the high temperatures from the brake drum. A failure of this component (НАПРИМЕР., a crack, or a bolt loosening from vibration) will cause the sensor to lose its alignment, resulting in a failure of the Блок логики датчика переднего моста FAW and the ABS system.

Основной компонент 3: The ‘Sensor Sleeve’ (3550361-6С)

The ‘Sensor sleeve’ (3550361-6С) is the final component of the Блок логики датчика переднего моста FAW. В списке указаны два из них.. Этот компонент “логика” is one of protection and precise fit.

Этот “рукав” 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 seat’ (3550111Б1Х).

This provides two functions. Первый, it ensures a snug, perfect fit, centering the sensor in the bracket’s bore and preventing it from vibrating. Второй, and most importantly, it prevents **galling and corrosion**. The ‘Sensor seat’ is often cast iron or steel, and the ‘Wheel speed sensor’ body may be aluminum or plastic. In a high-salt, high-water environment (like a wheel-end), these two dissimilar metals would corrode and “захватывать” вместе.

This sleeve acts as an “insulator,” preventing this corrosion. Этот “логика” ensures that the sensor can be removed for service years later, without breaking. A failed or missing sleeve will lead to a seized sensor, which will almost certainly be destroyed upon removal, turning a simple inspection into an expensive replacement of the entire Блок логики датчика переднего моста FAW.

FAW Front Axle Sensor Logic Assembly Parts List

В следующей таблице представлена ​​полная, подробная разбивка всех 3 components identified in the ‘Front Axle Sensor Logic Assembly’ (550) схема трактора FAW CA4251P66K24T1A3E5.

Технические характеристики и контекст сборки

Технические характеристики Блок логики датчика переднего моста FAW are defined by its function as the primary data-gathering tool for the vehicle’s active safety systems. The Блок логики датчика переднего моста FAW представляет собой высокоточный, safety-critical system.