Hitachi, Ltd.

Yasunari Tanaka

Kazuaki Takano

Makoto Shioya

Tatsuhiko Monji

Shigemitsu Higuchi

Akihiro Asada

Yoshihiro Ohta

Tadashi Saito

Tohru Sampei

Hiroshi Tomita

Kazuto Nakamura

Toshiyuki Sakamoto

Kazuhiko Hanawa

Syunji Iwasaki

Hiroshi Ozawa

Eiryoh Ondoh

Tatsuhiko Monzi

Eiryo Ondo

A vehicle-mounted device for an automatic charge receipt system capable of being designed, manufactured and installed while an encrypting/decrypting algorithm and/or encrypting/decrypting keys remain hidden. Included is an arrangement for discrimination (i.e., identification) of a vehicle-mounted device or user each time a utilization charge is determined/settled, wherein an initial portion of communications concerning discrimination is conducted without encrypting/decrypting, and remaining portions of communications are conducted with encrypting/decrypting so as to protect an integrity and security of the automatic charge receipt system. Confindential components/information, e.g., the encrypting/decrypting algorithm and/or keys, and components directly handling such information are arranged within a tamper-/access-resistant unit (preferably as a sealed integrated circuit package) in the vehicle-mounted device. Since an encryptor and a decryptor directly read the encrypting/decrypting key without such key being detectable outside of the sealed unit, it is not necessary for components outside the sealed unit to receive and/or handle the aforesaid encrypting/decrypting key or their contents. Accordingly such key remains hidden (i.e., inaccessable) within the sealed unit. The arrangement can further include an authentication protocol such as a 3-way authentication protocol, a 2-way.times.2 authentication protocol and a Fiat-Shimir authentication protocol.

Vehicle-mounted device for automatic charge receipt system

Image processing apparatus for vehicles

An environment recognition device formed in such a manner that an image sensor is installed so that an image sensor mounting location recognition mark falls within an image pickup area, comparator for comparing mark locations the images of which are picked up sequentially by the image sensor with respect to the initial location of the recognition mark in the image pickup area is provided, and, when it is detected that the mark location recognized sequentially has changed with respect to the initial location, an indication signal for indicating that correction of the location of installing the image sensor is required is outputted, thereby to prevent erroneous decision in image processing when the mounting position changes by vibration, contact or the like.

Imaging system for a vehicle which compares a reference image which

An alarm device for a vehicle comprises sensors for detecting abnormal states of the vehicle, a logic circuit for receiving the outputs of the sensors and producing one or more alarm speech designation signals and an alarm speech generator responsive to the alarm designation signal. The logic circuit includes a priority circuit for determining the order of precedence of the abnormal states represented by the detection signals on the basis of the degree of emergency, so that the alarm speech is concerned with the most emergent alarm when two or more abnormal states are detected simultaneously. The logic circuit may further include a switch circuit for disabling at least one of the detection signals so that a vehicle driver having taken notice of particular alarms is not disturbed by excessive alarming.

Alarm device for a vehicle including priority control for plural alarm

Growing community of inventors

Mito, Japan

Yasunari Tanaka