1 Acura MDX hybrid version of the technology overview and analysis
From Honda to Acura, from limousines to supercars, the Acura brand is full of Japanese artisan culture, and even has many similarities with Lexus and Infiniti. The first is the high-end products of Japanese brands, followed by the main products. The markets are all overseas based on the United States. The sales volume of Yingge has been tepid in the country. Although its hybrid version of MDX uses the same technology as the super-running NSX, it still cannot be escaped by the netizens who are nicknamed the millionaires. In the end, is the MDX after this small change different from the usual one?
Written in the front: Although Yangge has the blood of Japanese brands, he was born in the United States, and its sales are naturally mainly contributed by the United States. After all, there is no such brand in Japan. In modern terms, it is a mixed-race ABJ-America Born Japenese. Of course, the recent CDX and TLX extensions for China are a follow-up.
Acura MDX Sport Hybrid Technology Overview
Let me talk about how this MDX Sport Hybrid is going on. The new MDX is still the original third-generation model. It belongs to the category of remodeling. The most significant change is to change the powertrain from the original 3.5L V6 to "3.0. L+7 speed dual clutch + three motors", followed by the change of the front face of the middle net to the latest family style.
The main body of the hybrid system is a 3.0L V6 engine. The drive is a 7-speed dual clutch. A small motor is built into the gearbox to assist the front axle drive. Everyone will inevitably ask, what about the other two motors?
In fact, they are used to achieve the original SH-AWD four-wheel drive function in an electric way. The two motors of the rear axle can each output different torques. The main function is to increase the outer rear wheel torque during cornering, thus generating a torque for assisting the bending, so that the vehicle has stronger cornering performance. Unlike the 3.5L model, this motor solution eliminates the need for a complex transmission.
It can be said that this year, the song is very slanted. MDX is one of the top sales of Acura in China, and it is all replaced with a low-aware hybrid. Of course, on the one hand, it is a displacement tax, on the other hand, it is a compromise to the harsh and punitive fuel consumption regulations.
Although the V6 naturally aspirated engine is also used in the same displacement, the MDX of the hybrid version is much more fuel-efficient than the MDX of the fuel version. The overall fuel consumption can reach 7.9L/100km, and the fuel consumption is reduced by 22%.
MDX hybrid system technology analysis
Acura MDX hybrid system mainly consists of 3.0L V6 self-priming engine, 7-speed DCT transmission with built-in motor, motor drive inverter Power Drive Unit (PDU), power control unit Intelligent Power Unit (IPU) and dual motor unit Twin Motor Unit (TMU) is composed. Acura MDX places the motor drive inverter (PDU) and power control unit (IPU) under the front seats. This layout provides a flat floor for the rear seats, ensuring a spacious legroom while the trunk is Space has not been affected.
3.0L V6 engine
Back to this 3.0L engine itself, this MDX abandoned the 3.5L V6 engine on the old model and changed it to the full 3.0L+ hybrid. Of course, this move can greatly improve the power. At the same time, both fuel consumption and carbon dioxide emissions are reduced. The downside is that the 0.5L cut off makes the hybrid version of MDX lose the sense of smoothness when the large displacement engine overtakes.
The 3.0L self-priming engine injected by this intake manifold on the hybrid version MDX is not weak in terms of data. The maximum power is 192kW (261PS) and the maximum torque is 296Nm. After the three motors, the combined maximum power is 239kW (321PS). The maximum torque is 391Nm. The data is 23kW (31PS) higher than the fuel version MDX, and fuel economy is improved by 45%.
7-speed DCT gearbox
As a gearbox that is inseparable from the MDX Sport Hybrid hybrid system, Acura gave up the ZF's 9-speed automatic transmission with chaotic shifting logic (and sometimes shifting gears), while the new seven-speed transmission The cooperation with the hybrid power system is smoother. However, due to the innate cause of the hybrid system, even if the gearbox is downshifted, the motor will still emit motor noise due to continuous operation.
Three motors look faint? Not afraid, I will explain it to everyone. The layout of these three motors is located in the front axle (single motor) and rear axle (dual motor).
The front motor provides a peak output of 47PS. The motor is built into the 7-speed dual-clutch transmission and is geared to the front drive shaft. The front motor has three functions:
(1) Provide auxiliary power/torque for the V6 engine when driving the front wheels;
(2) Provide regenerative braking capability to help the vehicle bend or brake;
(3) Use this regeneration function to convert engine power to electricity to help charge the lithium-ion battery.
Two motor units (TMU) with a peak horsepower of 36PS are mounted on the rear axle of the cast aluminum housing (the inside of the rear differential of the traditional AWD model). The TMU provides advanced all-wheel drive capability and enhanced cornering performance (collectively referred to as steering vector technology) through dynamic torque vectors by providing torque (positive and negative torque) independently to the left and right rear wheels, while also providing regenerative braking to assist the battery. Recharge. The clutch allows each motor to be separated from the associated wheel under certain operating conditions to increase efficiency.
Power Control Unit (IPU)
If the three motors of the MDX in the front and rear axles are the flesh and blood of the hybrid system, then the power control unit (IPU) and the power control unit (PCU) are the brain and nerve centers of the MDX.
An IPU consisting of 72 1.3kWh lithium batteries is placed underneath the center console and cooled by air cooling.
The hybrid MDX's battery design was derived from the RLX Sport Hybrid, which evolved from a smaller battery and optimized electrode material, which increased battery power density by 10% and energy density by 20%.
Power Control Unit (PCU)
The Power Control Unit (PCU) is installed under the floor of the passenger compartment. It is liquid-cooled and equipped with a motor ECU. The ECU specifies the power management strategy for the Sport Hybrid SH-AWD system and three independent inverters. DC power is converted to AC for use with the three motors of the Sport Hybrid SH-AWD power unit.
2 Acura MDX hybrid four-wheel drive system technology analysis back to the top
MDX hybrid four-wheel drive system technology analysis
After learning about the MDX hybrid system, let's take a look at how the hybrid system converts power into driving force through the drive system.
Before you start, you need to have a general understanding of Honda's SH-AWD and SPORT HYBRID SH-AWD systems. You can understand SH-AWD as a set of original and more complicated mechanical drive systems, and SPORT HYBRID SH- AWD is a drive system that adds a lot of electronic elements, and it represents Honda's top production black technology.
The traditional SH-AWD is translated as Super Handling-All Wheel Drive. The front and rear axles can be distributed between 70:30 and 30:70, and the rear axles can be outputted to the rear axle. The torque is adjusted from 0 to 100%. You can't understand how the torque is distributed from 0 to 100%. You can see the following animation to understand.
So what about the performance of SPORT HYBRID SH-AWD on MDX?
The biggest highlight of the hybrid version of MDX is on the SPORT HYBRID SH-AWD system. This four-wheel drive hybrid system actually comes from the Acura RLX Sport Hybrid, and it also has many similarities with the hybrid system on the NSX. It can be said that it integrates the current top production technology of Honda, and MDX is also a carol. The first mass-produced hybrid SUV.
The essence of the SPORT HYBRID SH-AWD four-wheel drive system lies in the rear axle. The rear axle of the hybrid version MDX is driven by a dual motor unit TMU consisting of two motors. These two motors replace the traditional SH-AWD torque distribution unit (two sets of multi-plate clutches), which can distribute the driving force and braking force to the left and right rear wheels through two motors.
MDX hybrid SH-AWD drive mode
The Honda patent's steering vector technology mentioned above, the application of the large SUV such as MDX is different from the overrun handling of the super-running NSX. More consideration is given to optimizing the electronic four-wheel drive system to improve the passability and safety. The MDX's four-wheel drive system is not only equipped with traditional urban and off-road modes, but also optimized for high-speed crosswind and snowy driving conditions. Of course, fuel consumption is also an important consideration.
The MDX hybrid version has four driving modes: pure electric drive, engine drive, engine + motor drive and electronic four-wheel drive.
When the speed reaches 90km/h, the engine stop power output is only driven by the rear axle motor, but it will also be driven by the engine when the speed is 65km/h. According to the Yangge engineers, such setting logic can be the largest. To the extent that the performance of this hybrid system is achieved.
Written at the end
In summary, the Acura MDX uses the hybrid system used in the super-running NSX as a large seven-seat SUV. Optimizing the electronic four-wheel drive system improves the passability and safety without occupying too much space inside the vehicle, eliminating the complicated mechanism of the traditional four-wheel drive and reducing the fuel consumption to improve the driving performance of the vehicle. The goal of Acura to introduce the V6 hybrid system is to provide the performance of the V8 engine while only the fuel consumption of the four-cylinder machine. As for this mixed version of MDX can save the singer's tepid situation in China? We will wait and see, after all, sales are the best proof.
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