Abstract: System for detecting stability/instability of behavior of a motor vehicle upon occurrence of tire slip or lock. State of the motor vehicle is determined on the basis of an alignment torque (Ta) applied from a road and a side slip angle (?). By taking advantage of such torque/slip-angle characteristic that although the alignment torque is proportional to a side slip angle when the latter is small, the alignment torque becomes smaller as the side slip angle increases, a normal value is determined from a straight line slope and the side slip angle in a region where the latter is small. Unstable behavior of the motor vehicle is determined when deviation of actual measured value from the normal value increases. Further, unstable state is determined when the slope of the alignment torque for the slip angle departs significantly from that of approximate straight line slope.

Abstract: System for detecting stability/instability of behavior of a motor vehicle upon occurrence of tire slip or lock. State of the motor vehicle is determined on the basis of an alignment torque (Ta) applied from a road and a side slip angle (?). By taking advantage of such torque/slip-angle characteristic that although the alignment torque is proportional to a side slip angle when the latter is small, the alignment torque becomes smaller as the side slip angle increases, a normal value is determined from a straight line slope and the side slip angle in a region where the latter is small. Unstable behavior of the motor vehicle is determined when deviation of actual measured value from the normal value increases. Further, unstable state is determined when the slope of the alignment torque for the slip angle departs significantly from that of approximate straight line slope.

Abstract: System for detecting stability/instability of behavior of a motor vehicle upon occurrence of tire slip or lock. State of the motor vehicle is determined on the basis of an alignment torque (Ta) applied from a road and a side slip angle (?). By taking advantage of such torque/slip-angle characteristic that although the alignment torque is proportional to a side slip angle when the latter is small, the alignment torque becomes smaller as the side slip angle increases, a normal value is determined from a straight line slope and the side slip angle in a region where the latter is small. Unstable behavior of the motor vehicle is determined when deviation of actual measured value from the normal value increases. Further, unstable state is determined when the slope of the alignment torque for the slip angle departs significantly from that of approximate straight line slope.

Abstract: System for detecting stability/instability of behavior of a motor vehicle upon occurrence of tire slip or lock. State of the motor vehicle is determined on the basis of an alignment torque (Ta) applied from a road and a side slip angle (?). By taking advantage of such torque/slip-angle characteristic that although the alignment torque is proportional to a side slip angle when the latter is small, the alignment torque becomes smaller as the side slip angle increases, a normal value is determined from a straight line slope and the side slip angle in a region where the latter is small. Unstable behavior of the motor vehicle is determined when deviation of actual measured value from the normal value increases. Further, unstable state is determined when the slope of the alignment torque for the slip angle departs significantly from that of approximate straight line slope.

Abstract: A drive recorder system includes vehicle control devices that conduct arithmetic operation on the basis of input information from sensors and outputs the arithmetic operation result to an actuator to control a vehicle, in-vehicle LANs which are connected with the vehicle control devices, a gateway that mutually connects the in-vehicle LANs to enable communication, and a recording device which is mounted on the gateway and records the data outputted from the vehicle control device.

Abstract: A vehicular alternator failure determination apparatus is capable of making a failure determination accurately. The apparatus includes a maximum voltage detection part (1) for detecting a maximum voltage of an alternator commutating device which commutates an AC output of the alternator driven by an engine, a minimum voltage detection part (2) for detecting a minimum voltage of the alternator commutating device, a voltage difference calculation part (3) for detecting a difference voltage from outputs of the maximum and minimum voltage detection parts, and a failure determination part (4) which determines that the alternator is in a failure state, when an output of the voltage difference calculation part is equal to or greater than a prescribed voltage.

Abstract: System for detecting stability/instability of behavior of a motor vehicle upon occurrence of tire slip or lock. State of the motor vehicle is determined on the basis of an alignment torque (Ta) applied from a road and a side slip angle (&bgr;). By taking advantage of such torque/slip-angle characteristic that although the alignment torque is proportional to a side slip angle when the latter is small, the alignment torque becomes smaller as the side slip angle increases, a normal value is determined from a straight line slope and the side slip angle in a region where the latter is small. Unstable behavior of the motor vehicle is determined when deviation of actual measured value from the normal value increases. Further, unstable state is determined when the slope of the alignment torque for the slip angle departs significantly from that of approximate straight line slope.

Abstract: A failure diagnosis apparatus for a vehicle enables communications between a gateway, which automatically and effectively collects information on a condition of a vehicle having a plurality of network buses, and an information center outside the vehicle in an automatic and efficient manner. A failure diagnosis section is mounted on the gateway installed on the vehicle. The vehicle-installed gateway has a connecting section for connection to information communications terminals such as portable telephones through wireless communications. In addition, the vehicle-installed gateway has a protection processing section for performing security processing on possession information possessed by the gateway.

Abstract: A drive recorder for a motor vehicle capable of ensuring high security against a third party without need for using a password system. The drive recorder includes a volatile memory (102) for constantly recording various vehicle operation data concerning operation of a motor vehicle, a collision detecting means (120) for detecting a collision event of the motor vehicle, a transfer means for transferring the vehicle operation data stored in the volatile memory (102) before, upon or after occurrence of the collision event, and a nonvolatile memory (104) for recording and holding the vehicle operation data transferred thereto, wherein the transfer means includes an encryption means (103) which is designed for encrypting the vehicle operation data. The nonvolatile memory (104) is designed for recording and holding the encrypted vehicle operation data.

Abstract: A drive recorder system includes vehicle control devices that conduct arithmetic operation on the basis of input information from sensors and outputs the arithmetic operation result to an actuator to control a vehicle, in-vehicle LANs which are connected with the vehicle control devices, a gateway that mutually connects the in-vehicle LANs to enable communication, and a recording device which is mounted on the gateway and records the data outputted from the vehicle control device.

Abstract: A failure diagnosis apparatus for a vehicle enables communications between a gateway, which automatically and effectively collects information on a condition of a vehicle having a plurality of network buses, and an information center outside the vehicle in an automatic and efficient manner. A failure diagnosis section is mounted on the gateway installed on the vehicle. The vehicle-installed gateway has a connecting section for connection to information communications terminals such as portable telephones through wireless communications. In addition, the vehicle-installed gateway has a protection processing section for performing security processing on possession information possessed by the gateway.

Abstract: A case which accommodates electronic control circuit is housed in a housing box. An air passage is formed between the case and a main body of the housing box to introduce cooling air for cooling an electronic control circuit in the case. A heat sink is attached to an inner surface of the case by a screw placed in a through hole formed in an area of the case to which the cooling air is not introduced. Accordingly, the electronic control circuit in the case is prevented from dust, water and the like. Further, the electronic control circuit is efficiently cooled down by the cooling air passes through the air passage via the heat sink and the case because an exothermic electronic element of the electronic control circuit is making a contact with the heat sink.