Search Results

The authors have developed a long range version human body sensing module. This module has a high measurement accuracy with a capacitance of less than two femto Farads and can detect more distant human bodies compared with conventional sensors. Furthermore, optimizing the electrode structure of this module, noise tolerance and directivity have been improved. We produced some prototypes of this sensor module and evaluated the sensitivity of them in a vehicle. The results show that the prototype can detect a hand at the distance of 300 mm from the sensor electrode.

14V/42V dual voltage system is being introduced. Wiring harness is one of the important components in the 42V system, but it has a lot of subjects to be solved. Among these subjects, we focused on arc discharge phenomenon which occurs while unmating connectors. This paper describes the influence of the arc discharge on connector terminals, and the very promising solution, which is a new type of connector for 42V automotive electrical system.

The thermal stresses of various joints between contacts and wire conductors in Insulation Displacement Contact (IDC) connectors were calculated by the finite element method, and the life of each joint was predicted qualitatively. Next, several connectors evaluated well durable at the prediction were subjected to 1,000-hour combined environmental testing. Consequently, a highly reliable IDC connector for automotive applications was developed. Furthermore the predicted life trend of the connectors virtually agreed with the environmental test results.

The on board multiplexing communication system is regarded as a necessary technology for the future of electronics in automobiles. Many companies are developing multiplexing systems, and the ISO and SAE have been active in establishing standards for communication protocols. The proposed communication protocols have different specifications. Consequently, no compatible evaluation standards exist, so it was difficult to compare one protocol to another. Therefore, to assist the standardization activities of the ISO and SAE, we have developed an evaluation method for distributed multiplexed communication systems and have evaluated each of the proposed protocols using this method. These evaluations were performed from the point of view of the future users of these systems. In this paper we present the results of the experiments on eight distributed multiplexed communication systems, each of which consists of a communication IC and the proposed physical layer.

A complete multiplex system intended primarily for Class A applications was implemented in a sub-compact car and potential wire harness reductions such as weight, number of wires, and other factors were evaluated. It was found that a multiplex system can have a considerable effect in simplifying the harness, particularly in reducing its weight.

While basic automobile performance is improving along with the growth of higher value-added features, rapidly increasing use of electrical and electronics systems with complex wire harnesses is becoming a problem. This is bringing the automotive distributed control multiplex system to commercial reality. At present, standardization of protocols is under deliberation by SAE and ISO, and several protocols are being considered as candidates. To select a multiplex LSI having an optional protocol, we have established a method to evaluate automotive distributed control multiplex system from the standpoint of users. The method will permit comparison of various multiplex LSIs including physical layers and their protocols' performance/reliability, while helping clarify their features and areas of applications. It is our hope that through this activity of ours, we will be able to make some contribution to global standardization in the field.

On board multiplexing communication system is regarded as a necessary technology for the future of electronic system in automobiles. Many companies are developing multiplexing systems and the ISO and SAE are active in establishing standards for communication protocols. The proposed communication protocol specifications have different specifications. Consequently, no compatible evaluation standards existed, and it was difficult to compare one protocol to another. Therefore, to assist the standardization activities of the IS0 and SAE, we have developed an evaluation method for distributed multiplexed communication systems and evaluated each of the proposed protocols using this method. These evaluations were performed from the point of view of the future users of these systems. In this paper we present the results of the experiments on distributed multiplexed communication systems each of which consists of communication IC and the proposed physical layer.

Several types of wire harness were designed and then harness characteristics, harness weight, cost and reliability were estimated in order to verify the change of wiring system of a sub-compact car model with the class A multiplex system implemantation.