How to Pass Subject Two in One Attempt?

[StAnthony]

The pass rate for Subject Two is relatively low. On the shuttle bus, you often hear people complaining about things like the car being bad or the test site being non-standard, as if the examiners are deliberately failing students. In reality, it's not that serious at all. The cars may vary slightly, but the impact is minimal; the test sites are all standardized. Those who struggle the most (a significant portion being middle-aged women) are the ones who fail repeatedly and complain the most. Don't listen to them. Paying for a trial test will make things clear. Theoretical Basis One: The Three-Point Alignment Principle When your eyes, a specific point on the car body, and a marker on the ground form a straight line, you can determine the car's position. For example, when reversing into the garage, if your eyes see the lower edge of the left rearview mirror aligning with the garage line, it means the car is perfectly in the garage. Why? Because your eyes, the lower edge of the left rearview mirror, and the ground in front of the car form a straight line. Another example: if your eyes align with a red dot (or a node on the windshield wiper, which could be a dot or a square) and the line on the right side of the road, it means the right side of the car is about 30 cm away from the line. Theoretical Basis Two: The Parallel Principle Two parallel lines remain roughly parallel even under weak perspective. Therefore, if the car body in the rearview mirror appears parallel to the line on the ground, it is actually parallel. Looking to the left, if the left side of the car body is parallel to the line on the ground, it means the car body is parallel to the line. Theoretical Basis Three: Control Methods For humans, many controls are based on feeling, but for machines, control algorithms are needed. In automatic control, the essential steps are: setting a reference target position, observing the actual feedback position, comparing them, and executing the control. Car Principle One: Clutch and Gear Shifting The engine and the wheel drive shaft are connected via the clutch. Simplified, the engine keeps rotating while the other end is a wheel, connected by the clutch. The clutch can be seen as a friction plate. When tightly pressed together, the engine and the wheel are firmly connected; if completely separated, they don't affect each other; if slightly pressed, it's half-clutch. The role of half-clutch: when starting, the engine rotates, but the car remains stationary. If the clutch is fully released and the friction plate is pressed hard, the high-speed rotating engine suddenly collides with the stationary drive shaft, causing the engine to stall. Thus, half-clutch acts as a buffer, allowing gradual contact. This applies not only to starting but also to gear shifting. Controlling speed and clutch essentially means controlling the engine's output power. Car Principle Two: Forward and Reverse Driving The vehicle's steering revolves around a point on the rear axle, creating an arc. From the diagram, you'll notice: the front wheels have a larger turning radius than the rear wheels, so in an S-curve, the rear wheels are closer to the inner line while the front wheels are farther away. The steering direction is the same whether moving forward or backward. Turning the steering wheel to the left will make the car veer left, regardless of direction. Calibration As an engineering student, I know calibration is crucial. Calibration means "establishing standards." Only under consistent standards can you use familiar, unchanging methods for precise control. Calibration mainly involves adjusting the seat and rearview mirrors. My calibration method: first, park the car accurately in the garage, ensuring the lower edge of the left rearview mirror aligns with the garage line and both mirrors show the rear garage corners. This means the seat and mirrors are adjusted to "my standard position." How to Adjust the Seat and Rearview Mirrors Use the above calibration method to find the standard position. However, during the exam, you can't adjust like this, so establish five calibration results for adjustment. Park the car in the garage, adjust the seat and mirrors to the best position, then "one press, two stretches": press the clutch, lean your back against the seat, stretch your left arm forward horizontally to rest on the steering wheel's upper edge, and use your right hand to adjust the seat. If the clutch feels comfortable and your left wrist just rests on the steering wheel edge, it's suitable. Then, lean your back against the seat and stretch both arms forward. If both wrists can rest on the steering wheel edge, it's perfect. Otherwise, fine-tune the seatback angle. "Up, Down, Left, Right": First, adjust vertically so the front door handle is in the middle of the rearview mirror, and the rear door handle is just visible. Then, adjust horizontally so the white car body occupies a quarter of the mirror. Repeat adjustments, ensuring your back is always against the seat. Exam Process 1: Reversing into the Garage Secure the seat, fasten the seatbelt, adjust the seat and mirrors, and release the handbrake. Adjust the car's position if the previous test-taker left it in a poor state.