The simpler the structure, the better the stability. For cars, the more traditional and simple the control system, the better the durability and stability. The simpler the structure, the fewer the control variables, and the lower the possibility of problems. It is impossible for such a vehicle to have unstable performance. After all, it has no room for damage. The more complex the structure is, the more elements are involved, and the difficulty of coordinated control of the whole system is multiplied. This structure is naturally easy to be destroyed.
Manual transmission vehicles For manual transmission vehicles, engineers only need to calibrate the engine parameters and control the fuel injection, air intake and spark plug ignition time of the engine in the process of calibrating the vehicle power system. The direct installation of the transmission does not need to consider the matching control between the engine and the transmission, which makes the control system of the vehicle less difficult. When the manual transmission vehicle shifts gears, only the owner needs to manually control it himself. The left foot controls the clutch and the right foot controls the throttle, which is simple and convenient.
It is very difficult to control the automatic transmission car. Engineers need to calibrate not only the engine, but also the transmission, such as transmission upshift, downshift, PRND shift and so on. They also need to conduct high and low temperature tests to verify whether the stability of the transmission will be affected under extreme working conditions.
In addition to the calibration of the transmission itself, the control protocol between the engine and the transmission should match. For example, the car mainly starts the engine, and the transmission must be in P gear; When the owner steps on the accelerator to accelerate, the transmission should be in D gear. In order to ensure the smooth shift, it is necessary to control the output torque of the engine in time, and sometimes it is necessary to control the torque to ensure the driving comfort of the vehicle. When the temperature of CVT transmission is low, the engine output torque should not be too high to prevent slipping; If there is a big fault in the transmission, the engine work will also be affected, and there may be a situation where the accelerator is not injected and the vehicle cannot accelerate.
The overall level of manual transmission and automatic transmission in China has been severely tested due to the introduction of automatic transmission. Domestic cars, however, have a weak foundation and do not have their own transmissions, so they can only import automatic transmissions of joint venture brands. However, the control process of engines and transmissions of domestic cars is not accurate, which leads to the unreliability of automatic transmissions of domestic cars, while the structure of manual transmissions is relatively simple and the quality of domestic cars is acceptable.
But technology is always improving, and the development speed of domestic cars is also staggering. Now Geely, Great Wall, Chery and other car companies have developed their own automatic transmissions, with their own independent control systems, which can't be said to be very accurate, but at least the stability and durability have been obviously improved. More and more car owners have purchased automatic transmissions of domestic cars, such as Geely Emgrand, Changan Yidong, Great Wall Haval H6 and Changan CS75.
To sum up, it is best to buy manual transmission for domestic cars, which is a distrust of the quality of automatic transmission for domestic cars and an recognition of the durability and stability of manual transmission. However, the technology of domestic cars is progressing rapidly now, and the overall performance of automatic transmission cars of domestic cars is also good, so car owners can try to buy them.