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Hitachi

Hitachi Automotive Systems Ltd.

Research and Development / Simulation & Analysis Technologies

The Hitachi Group’s formidable simulation & analysis technologies for phenomena such as vibration, electromagnetic fields, vehicle motion dynamics, and autonomous driving are applied to the development of automotive technologies to create a safe, clean, and comfortable automotive society.

xEV System Simulation Technorogy

For vehicles driven by electric motors, quietness is a valued product characteristic, and vibration control is the key to quietness. Vibration generated from the powertrain is determined by the mechanical vibration (resonance point) and the excitation force associated with device operation. The resonance point can be determined using structural analysis during product design. However, the excitation force—the electromagnetic force synthesized by the influence of the current pulsation caused by the magnetic circuit and the control—changes according to the operating state. In order to evaluate vibration during the design phase, we have developed a technology that models the electrical characteristics of the motor and inverter, and is linked to the control in order to analyze the electromagnetic force and utilize it to achieve low Noise Vibration Harshness (NVH). Calculations are reduced due to one dimensioning, and it becomes possible to conduct an analysis of vibration that includes the control logic, replicating an environment close to that of an actual vehicle.

images : xEV System Simulation Technorogy

Vehicle Motion Control

G-Vectoring Control (GVC) is a vehicle motion control technology developed from research conducted in collaboration with the Kanagawa Institute of Technology. Our vehicle control algorithm ensures smooth and efficient vehicle motion by linking the horizontal and vertical motion of the vehicle in order to optimize the ground load between the four wheels, resulting in the vehicle moving as if handled by a skilled driver.

images : Vehicle Motion Control

Autonomous Driving Simulator

In order to verify the safety of Autonomous Driving, extensive test driving is required. In response, we have developed simulation technology that enables virtual test driving. On a computer, a virtually driven vehicle sends sensor information to an actual Autonomous Driving ECU. Based on the sensor information, the ECU then generates vehicle control information and reproduces vehicle behavior. Through this technology, we can perform functional verification and quality improvement of Autonomous Driving systems.

images : Autonomous Driving Simulator

  • *Previously, sensor and map data was individually processed and managed. However, we have developed an ECU that utilizes a built-in, real-time database to organize data by type, thereby reducing registration and search time to approximately 10 microseconds, 1/100th of the time compared to previous in-house figures.

Motorsports
Motorsports