The 4A91T engine is derived from Japan's Mitsubishi engine technology. It was jointly developed by Shenyang Aerospace and Mitsubishi. It was mass-produced in 2013. It was awarded the title of “2014 Power Pioneer†for 14 years due to its strong power and economic fuel consumption in the same displacement engine. The maximum torque is 215N.M and the power is 115kw.
This engine has been upgraded from the Mitsubishi 4A91 engine. Although it is not currently available in the current market, it is considered a medium-to-high configuration in domestic models. With its small size, light weight, high performance, low fuel consumption and environmental performance (European five emission standards, it is upgrading Euro 6), it has occupied a large position in the Chinese market. Moreover, its reliability has been unanimously recognized in the industry. For the stability of the 4A9 series engine, there is such a saying: the vehicle is not scrapped, and the engine does not need to move the wrench.
First, the following describes the structure of the 4A91T engine:
1. Turbocharger: The 4A91T uses the turbocharger of Mitsubishi's original technology. Its core components, turbine, high-speed bearing and pump wheel assembly are imported from Japan, and only the volute is assembled and assembled in China. It uses the engine exhaust to push the turbine, which drives the pump wheel to pressurize the intake air to improve the engine intake efficiency and achieve the performance improvement. Compared with natural inhalation, the power is increased by 30%, the torque is increased by 40%, and the fuel consumption is quite equal. Take the DX3 and DX7 of the Mitsubishi 4A91 and 4A91T engines respectively as an example. The fuel consumption per 100 kilometers is 5.8L and 5.9L respectively.
The external engine characteristic refers to the maximum torque that the engine can exert at each speed. The higher the better, the figure can be seen from the engine idle speed, turbocharging and starting function (don't believe what turbo 2000 rpm Only then began to intervene.), the torque of the supercharged engine to about 1400 rpm is greater than the maximum torque of the naturally aspirated engine, and you can feel the obvious power boost. And unlike the naturally aspirated engine, the maximum torque range of the supercharged engine is expanded to 2000-4500 rpm.
Developing good driving habits is also the basis for both motivation and low fuel consumption. Summarize the driving habits that are fuel efficient and enjoy good power:
(1), to master the timing of shifting, let the engine run as high as possible in the high-speed range, 2000-2500 shift is a good time.
(2) In the starting or low-speed taxiing conditions, you can properly step on the throttle to allow the engine to run at a higher speed, with higher torque, smoother acceleration, and higher fuel efficiency.
(3) Try to avoid stepping on the throttle as soon as possible. At this time, the engine will enter the external characteristic condition, the fuel injection will be thickened, part of it will be used for power reinforcement, and part will be used to reduce the discharge temperature (to avoid knocking and too much heat radiation). Inefficient, and because the combustion is not complete, it is not environmentally friendly.
(4), try to avoid high-end low-speed driving, low efficiency, easy to accumulate carbon deposits, further loss of engine performance
(5) A car that has been driven in the urban area for a long time, occasionally running on a highway, blowing carbon deposits is also necessary to protect the engine and improve efficiency.
2, double overhead camshaft DOHC and MIVEC variable valve timing technology
The MIVEC technology used in the 4A91 not only optimizes the valve's opening time phase, but also changes the valve's opening stroke to increase the intake air volume. It can achieve low fuel consumption, low emissions and high performance in a wide speed range. This technology is superior to VTEC and VVTI technologies, and they do not have both functions.
3, aluminum-magnesium alloy pressure casting cylinder: the use of aluminum alloy cylinders, can achieve engine weight, improve heat dissipation, acceleration performance and fuel economy, but will reduce the yield and increase a lot of manufacturing costs.
4. Resin material intake manifold and rocker chamber cover, reverse exhaust manifold: Most conventional engines use aluminum or cast iron intake manifolds, and the exhaust manifold is placed forward. The 4A91 is designed to reduce weight and reduce fuel consumption.
5, timing chain transmission: most of the old-fashioned engines, in order to reduce production costs, the use of timing belts, every tens of thousands of kilometers, must replace the belt and tensioner. Timing chain, normal use, life expectancy of hundreds of thousands of kilometers, the engine does not need to be replaced until scrap, this alone, the user's life cycle cost can be reduced by 5000 to 10,000 yuan!
6. Electronic throttle: matched with the electronic throttle, the sensor detects the accelerator pedal signal, and the ECU controls the DC stepping motor action on the electronic throttle to control the intake air volume of the engine to realize the change of the rotational speed. Electronic throttles not only save fuel but also reduce harmful emissions. The 4A9 series engine can easily meet the most stringent Euro 5 emission standards.
7. Independent ignition device: The 4A91 uses independent ignition, and each cylinder has a separate ignition coil. The ignition energy will be higher, the ignition timing control will be more precise, and the combustion will be more thorough.
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