What is hardcore off-road? Perhaps many people think of the SUV first, right! It is also possible that some people will think of non-loaded bodies, which is also true, but only a few people will say that hard-off cross-country must have a differential lock. And these people are the "tough guys" who are knowing off-road.
In the real cross-country circle, there is such a saying: "There is nothing that can't be solved by a lock. If you have two words, you can talk about it." The lock mentioned here refers to the differential lock. It can be seen that this lock is in the lock. The status of the cross-country industry.
To say that the differential lock is the first to talk about the differential. The most popular way to say the differential is to control the speed of the two drive wheels. The turn of a car can be seen as a circular motion, which involves angular velocity and linear velocity. Since the wheels of the car are all on one axis, the angular velocity is the same, then the line speed is seen at this time.
The wheels that are closer to the center of the circle should be turned a little slower to keep pace with the wheels that are far from the center of the circle, or they will slip and roll over. So smart humans invented the differential in order to fit the two wheels well. Differential differential means that the speed of the two wheels is different. Interested students can watch this video, which has a very intuitive explanation.
Please watch the video under WiFi status
Then, with the differential, a problem is revealed, that is, when one wheel of the car is suspended or slipped, the wheel will keep turning, while the other side of the wheel will not move. This situation is simply impossible. Then at this time, we need this wheel to move.
Therefore, the differential lock came into being. As the name suggests, the differential lock is to lock the differential. When you are in trouble, only one wheel has adhesion. At this time, the differential lock is opened, and the differential will temporarily fail, allowing the two horizontal wheels to achieve a "hard shaft connection." The wheels on both sides rotate at the same speed, and the car can be smoothly removed.
However, the differential lock can no longer be opened on the normal road, because once the turn is in danger, the slip will be out of control, and the rollover will be in danger. So everyone should remember!
In addition to the manual mechanical differential lock (toothed type) there is also an electronic differential lock. The electronic differential lock detects the rotational speed of the driving wheel through the sensor of the ESP system, and then judges whether the wheel loses the adhesion force through the on-board computer, and brakes the wheel on the side that is slipping or floating, and the tire with adhesion is improved. Power output helps the vehicle get out of trouble, a bit like vector distribution power.
The above is some knowledge of the differential and the differential lock. I hope that friends who like off-road can understand and learn, and will be useful later.
HDMI, known as High Definition Multimedia Interface, is mainly used for transmitting HD audio and video signals.
There are three types of data transmitted by HDMI TMDS (plus Hsync and Vsync count as four) :
1.Preamble (control information) is mainly used to control the Data to be transmitted next, namely Data Island or Video Data
2.Data Island, all kinds of packet information, including audio packet, image packet, etc
3.Video Data, Video pixel Data. HDMI can transmit pixel Data in RGB and YUV formats
4. And Hsync and Vsync
HDMI Source device (HDMI HPD) will monitor the Hotplug port of the sink device. If the Hotplug is High, it will prove that the device can work, and then read DCC; if it is low, it will prove that the device is disconnected.
The HDMI Sink device should notify the source device that EDID has been changed by pulling the Hotplug down, and the source device will read the new EDID again after the Hotplug is pulled up, which should be more than 100ms.
HDMI provides that the EDID can be read by DCC when the 5V pin of HDMI is powered on, that is, the Hotplug needs to be high, and some Hotplug is directly connected to the 5V
TMDS Clock is the Pixel Clock, the Clock frequency used for a Pixel point. Through TMDS Clock CLK pins transmitted to the receiver, but the receiver is not clear for what TMDS Clock frequency of the sender sent, so you need to through the Phy (Phy is analog to digital conversion section, is different from the ADC, Phy is don't know the sampling frequency, the need to lock frequency and phase lock, detect the exact input frequency) to lock.
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