Technology surpasses Toyota? Uncovering Honda Fuel Cell Vehicle Technology

Honda held the "2015 Honda Meeting" at the Honda Institute of Technology Automotive Research and Development Center in October to introduce the new technology being developed to the news media. In addition to the miniaturization technology of the new fuel cell vehicle (FCV) and its components, the prototype of the new "NSX", plug-in hybrid electric vehicle (PHEV), the world's first 10-speed AT (in the world) Automatic transmission), high efficiency engine and automatic driving technology. In addition, automated driving was demonstrated using a test vehicle.

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In terms of FCV, the miniaturization technology of the powertrain system was introduced. The miniaturization of fuel cell stacks, voltage control units (VCUs), power control unit (PCU) integrated drive motors, speed reduction mechanisms, and electric compressors has been achieved. For the first time in the mass production FCV, the powertrain system has been deployed. Under the front hood. According to reports, the powertrain is about the same size as the V-type 6-cylinder engine.

Technology surpasses Toyota? Uncovering Honda Fuel Cell Vehicle Technology

FCV's integrated powertrain

Technology surpasses Toyota? Uncovering Honda Fuel Cell Vehicle Technology

Chassis used by FCV

The fuel cell stack has a 50% increase in current density compared to the FCV "FCX Clarity" that began to be rented in 2008, reducing the number of stacked cells by 30%. In addition, the laminate size was reduced by 20% by reducing the interval between each battery cell to 1 mm. This achieves miniaturization of the fuel cell stack. The fuel cell stack has an output density of 3.1 kW/L, the highest level in the world.

Technology surpasses Toyota? Uncovering Honda Fuel Cell Vehicle Technology

Original fuel cell stack (left) and new fuel cell stack (right)

Technology surpasses Toyota? Uncovering Honda Fuel Cell Vehicle Technology

Improvement project of fuel cell stack (Honda's slide)

According to reports, the vehicle chassis used in this FCV is planned to be used in Honda's pure electric vehicles (EV), PHEVs and FCVs. The chassis can be equipped with an engine and a motor under the front hood, and a battery is provided in the hydrogen fuel tank portion below the front seat and below the rear seat, which can be widely used in a variety of models. The PHEV currently being developed by Honda is scheduled to use the chassis of the FCV. The relevant technical staff said, "It should be practical to be implemented around 2018." On the same day, the test drive of the PHEV trial car was also carried out.

Technology surpasses Toyota? Uncovering Honda Fuel Cell Vehicle Technology

Test vehicle for plug-in hybrid electric vehicle (PHEV)

With regard to the new gearbox equipped with the engine car, Honda announced that it is developing the world's first FF car (front engine, front-wheel drive) with a 10-speed AT for the purpose of improving efficiency and driving performance. Compared with the company's 6-speed AT, it not only improves fuel efficiency by 6%, but also increases the transmission ratio range (speed ratio range) to 10, and the acceleration performance at low speed and the quiet performance at high speed are also excellent. The length can be controlled at the same level as the 6-speed AT and is planned to be equipped with a 3.5L displacement vehicle.

Technology surpasses Toyota? Uncovering Honda Fuel Cell Vehicle Technology

Increase fuel efficiency and acceleration with a 10-speed AT (automatic transmission). (Honda's information)

In terms of the thermal efficiency of gasoline engines, Honda has previously increased thermal efficiency through supercharging. In the future, if we want to further improve the thermal efficiency, we cannot do without the advancement of combustion technology. As a related technology, the company is mainly studying two technologies of "introduction of EGR (exhaust gas recirculation) by supercharged engine" and "super-homogeneous lean combustion".

The former is a technique for suppressing knocking by an increase in pressurization and EGR, and reducing heat loss by low-temperature combustion. The latter is a technique for igniting combustion of a combustion gas in a cylinder more uniformly to reduce uneven combustion temperature and reduce NOx (nitrogen oxide). In order to stabilize the ignition, a high-energy ignition must be performed using a discharge spark plug. The relevant technical personnel said that the establishment of these technologies "before and after 2020".

The main technical aspects of autonomous driving introduce Honda's independent research to improve driving safety and comfort. The center content is a project "action plan" for the self-driving car to select the best route, and the vehicle control technology "route tracking vehicle control" that runs correctly on the route. This is a relatively difficult item of "judgment" and "control" in autonomous driving.

Technology surpasses Toyota? Uncovering Honda Fuel Cell Vehicle Technology

Honda’s main technology for autonomous driving

The "action plan" is a technique for judging which kind of travel route the vehicle should travel according to the information obtained by the on-vehicle sensor to drive safely and comfortably. In a timely manner, changes in driving conditions such as lane change and queue cutting can be handled at any time, and the best route is selected from a plurality of driving routes. "Route Tracking Vehicle Control" uses a vehicle-mounted camera, high-precision GPS (Global Positioning System), high-precision three-dimensional map, yaw rate (rotational angular velocity) sensor, etc. to estimate the position and posture of the vehicle, and detects the deviation from the target route through the steering wheel. The technique of correcting the control of the throttle and brakes. Honda plans to autopilot on highways around 2020, and these are the technologies being developed to achieve this goal.

Honda is conducting an empirical test using test vehicles, and demonstrated autopilots using GPS and route tracking vehicle control technology at the venue. In the test field, GPS is used to accurately track the route set in advance with an accuracy of tens of centimeters.

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Breaking load between 40kN and 240kN
Frequencies up to 100 Hz are supported.
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Parameters

Currency Designation U70B/140 U70B/146 U70B/127 U100B/146 U100B/127 U120B/146 U120B/127
Designation LXP3-70 LXP1-70 LXP2-70 LXP-100 LXP2-100 LXP-120 LXP2-120
Diameter D,mm 255 255 255 255 255 255 255
Spacing H,mm 140 146 127 146 127 146 127
Creepage L,mm 320 320 320 320 320 320 320
Socket Soupling,mm 16 16 16 16 16 16 16
Mechanical Falling Load,KN 70 70 70 100 100 120 120
Mechanical Routine Test,KN 35 35 35 50 50 60 60
Wet Power Frequency withstand voltage,KV 40 40 40 40 40 40 40
Dry Lighting Impulse withstand voltage,KV 100 100 100 100 100 100 100
Impulse Puncture Voltage,PU 2.8 2.8 2.8 2.8 2.8 2.8 2.8
Power Frequency Puncture Voltage,KV 130 130 130 130 130 130 130
Radio Influence Voltage,μv 50 50 50 50 50 50 50
Corona Visual Test,KV 18/22 18/22 18/22 18/22 18/22 18/22 18/22
Power Frequency Electric arc voltage 0.12S/20KA 0.12S/20KA 0.12S/20KA 0.12S/20KA 0.12S/20KA 0.12S/20KA 0.12S/20KA
Net Weight per unit,KG 3.6 3.6 3.5 4 4 4 4


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