The choice of reversing radar should be "data" in mind"

With the increasing number of cars and the increasing shortage of parking spaces, parking becomes a headache for many car owners. At this time, the reversing radar becomes your good assistant. Now, the reversing radar is no longer unique to high-end vehicles. You can select a reversing radar for your car.

Reversing radar, also known as parking assistance system or reversing computer warning system. Generally, a reversing radar consists of an ultrasonic sensor (commonly known as a probe), a controller, a display (or a buzzer), and other components. The system adopts the principle of Ultrasonic Ranging, In-control Under the control of the Controller, the sensor emits ultrasonic signals. When an obstacle is encountered, an echo signal is generated. After the sensor receives the echo signal, the controller processes the data and determines the location of the obstacle, display distance by the monitor and other warning signals, get timely warning, so that when the driver reversing to make the heart of the "Number", so that reversing more easily.

At present, there are more than 20 brands of reversing radar on the market, with prices ranging from 300 or 400 yuan to 1000 or 2000 Yuan. Many car owners do not know how to compare and choose from. Through the analysis of reversing radar products on the market, the author prompts users to pay attention to the six major considerations for reversing radar products.

1. Functions

The fully functional reversing radar should provide distance display, sound alarm, regional warning and direction indication. Some products also have the power-on self-check function. At present, there are also products with the voice alarm function on the market, which gives people a direct feeling, but the main problem is that the alarm lags behind, so that the driver is not practical after the brake is delayed.

2. Performance

The performance mainly includes the detection range, accuracy, display stability, and target capturing speed.

Detection range. Most products range from 0.4 ~ 1.5 m, good products can reach 0.35 ~ 2.5 m, see Figure 2. The wide range of reversing radar can always measure the target in advance when reversing, And it is meaningless to excessively pursue the minimum detection distance, because the inertial Factors During automobile braking must be fully taken into account in actual use.

The accuracy of the detection mainly depends on two aspects: first, the display resolution, the average product is 10 cm, and the good product can reach 1 cm; second, the detection error, that is to say, the error between the display distance and the actual distance. We can use a pipe with a diameter of 10cm and place it at a position around 1 m. The Probe Error of good products should be less than 3 cm.

The display stability refers to whether the obstacle distance can always be captured and displayed stably when the obstacle reflector is not good.

The target capturing speed reflects the ability of the reversing radar to capture mobile objects. This is especially important to avoid collision accidents that are similar to children or cyclists who suddenly pass through the vehicle while the driver does not have sight.

In short, the performance requirements of the reversing radar are: accurate measurement, stable measurement, wide range, and fast capturing.

3. Appearance Process

As the interior and exterior decoration of a car, consider whether the display and sensor are beautiful after installation, and whether they are in harmony with the car.

From the sensor shape, you can choose two types: Buckle and converged. The surface of the buckle sensor is flat, and the surface of the fusion sensor is changed, the pursuit of a natural transition with the rear bumper. From the perspective of size, there are super small, medium-sized and large sizes, the size is relatively large, small relatively hidden, mainly depends on the size of the rear bumper and personal preferences. In terms of color, you should select the same or similar color as the rear bumper of the car.

The front-or back-mounted display should be selected based on the driver's reversing habits. The display should be clear and beautiful. Some products can use two monitors at the same time.

4. Quality and reliability

As a car product, the reversing radar has a high requirement on its quality and reliability. However, it is difficult for consumers to determine this indicator. Good quality products provide better services, and the promised replacement period and repair period are relatively long. We suggest you choose products with a repair period of more than 2 years.

5. Installation and after-sales service

The main consideration is the distributor's installation capability, service level, and Manufacturer's commitment to users.

6. Product Prices

The price of products should be considered only when the reversing radar functions and performance requirements are met. The price of a reversing radar with 4-way sensors and high cost performance should be around 1000 yuan. The price may be too high, but the price is too low, you need to pay more attention to the product quality and after-sales service to meet the basic requirements.

Che xuetang

Control and stability of vehicles

Cars, as people's mounts, have high expectations for them. They want them to be "Obedient"-rapid and accurate responses; they hope they can be easily and stably manipulated; it is hoped that it will not be moved in the face of ground convex and concave, strong winds and other interference; in case of danger approaching, it is hoped that it will be able to save danger. These expectations are closely related to the stability of vehicle control.

The control and stability of a car means that a car can follow the directions given by the driver through the steering wheel without being overly nervous or fatigued, in addition, it can maintain stable driving ability in the event of external interference. Control stability is related to steering systems, tires, suspension, and loads.

There are many items to evaluate the control stability, including steering sensitivity, positive response, steering radius, steering light, linear driving, and typical driving performance (such as cylinder bypass and parallel thread) ultimate driving performance (ultimate lateral acceleration, ultimate speed, and control capability when a side slide occurs.

There are two methods to evaluate control stability: subjective evaluation method and objective evaluation method. Subjective evaluation is based on the tester's own feelings, but the results are often different from person to person, and the causal relationship between automobile performance and automobile structure cannot be given. The objective evaluation method is to test through an instrument. The best evaluation method is to complement and correct each other.

However, after all, cars are driven by humans. Therefore, the subjective perception evaluation method is always the Final Evaluation Method for manipulating stability. A car that makes people feel like "everyone and vehicles" must be a good car.