Abstract: An electronic unit includes a double-sided substrate having an insulation substrate, a patterned first metal plate bonded on one side of the insulation substrate, and a patterned second metal plate bonded on the other side of the insulation substrate, and also includes a heat radiation member for releasing heat from the double-sided substrate. The heat radiation member is disposed adjacent to one of the first metal plate and the second metal plate generating a larger amount of heat than the other of the first metal plate and the second metal plate.

Abstract: Disclosed is a wiring substrate that is provided with a wiring pattern formed from a metal plate, and an insulation layer as a base material to which the wiring pattern is to be fixed. The wiring pattern has a mounting pad for having electronic parts (11) surface-mounted. Electronic parts are mounted onto the surface of the wiring pattern, by pouring solder into the mounting pad of the wiring pattern.

Abstract: A loudspeaker system capable of simultaneously providing listeners with a listening environment not giving them a feeling of strangeness. The loudspeaker system (100) comprises drive motors (111 to 113, 121 to 123) for so driving at least first R-channel loudspeaker (101) that the current first listening position is substantially included in the perpendicularly bisecting plane of a line joining the intersecting point of the first R-channel speaker (101) and its directivity axis and the intersecting point of the second R-channel loudspeaker (120) and its directivity axis and so driving at least fourth L-channel loudspeaker (104) that the current second listening point is substantially included in the perpendicularly bisecting plane of the line joining the intersecting point of a third L-channel loudspeaker (103) and its directivity axis and the intersecting point of a fourth L-channel loudspeaker (104) and its directivity axis. The loudspeaker system (100) further comprises their motor driver section (130).

Abstract: An anti-theft system is arranged so that an operation of an engine of a vehicle is maintained as it is even when a CPU of an engine control unit is reset for some reason during when the engine is operative. A CPU of a security ECU performs arithmetic operations for enabling or inhibiting injection of fuel to the engine and for enabling to start a starter on condition that a door key switch and an ignition switch are both turned on. The CPU of the engine ECU performs arithmetic operations to maintain the injection of fuel to the engine based on data of fuel injection enabling or inhibiting process stored in a B/U RAM even when it is reset after receiving the data of process for enabling or inhibiting the injection of fuel from the CPU.

Abstract: An anti-theft system is arranged so that an operation of an engine of a vehicle is maintained as it is even when a CPU of an engine control unit is reset for some reason during when the engine is operative. A CPU of a security ECU performs arithmetic operations for enabling or inhibiting injection of fuel to the engine and for enabling to start a starter on condition that a door key switch and an ignition switch are both turned on. The CPU of the engine ECU performs arithmetic operations to maintain the injection of fuel to the engine based on data of fuel injection enabling or inhibiting process stored in a B/U RAM even when it is reset after receiving the data of process for enabling or inhibiting the injection of fuel from the CPU.

Abstract: Disclosed is a fuel injection control apparatus wherein the quantity of fuel supplied to an internal combustion engine is derived from engine operating parameters including a voltage signal which is generated by electromagnetic induction as a function of engine speed. A fuel injection quantity calculation circuit derives the fuel quantity in accordance with the detected operating parameters of the engine. A fuel injection controller provides injection of fuel in accordance with the calculated fuel quantity when the sensor voltage is valid and provides forced fuel injection regardless of the calculated fuel quantity when the sensor voltage is invalid and the engine starter is being operated.

Abstract: In a fuel amount control apparatus arranged to determine the amount of fuel to be fed to respective cylinders so that the scattering in torque generation throughout the cylinders is suppressed, the amount of correction which is either added to or subtracted from a basic fuel amount, is computed such that a sum total of fuel amount correction factors substantially equals zero. To this end the sum total of the correction factors is first computed and is then checked whether an absolute value of the sum total is greater than a predetermined value. When greater, a given amount is either added to or subtracted from correction factors respectively provided for respective cylinders.

Abstract: Fuel amount control apparatus arranged to determine the amount of fuel to be fed to respective cylinder so that the scattering in torque generation throughout the cylinders is suppressed. Correction amounts are first obtained during idling, and these correction amounts are then modified using at least one engine parameter so that they can be used not only in idle state but also other operating states. To this end, a correction factor is computed using engine speed or the like so as to modify the correction amounts thereby. As a result, a basic fuel amount is corrected by correction factors provided for respective cylinders where the correction factors are further modified to be suitable for any engine operating conditions, providing smooth rotation without uncomfortable vibrations.

Abstract: The engine speed is periodically detected at every predetermined crankshaft angles for obtaining a plurality of engine speed data whose number equals an integral multiple of the number of cylinders of an internal combustion engine. Either maximum or minimum values among the plurality of engine speed data is determined, and such operations are repeated for a duration covering all power strokes within all the cylinders, thereby obtaining a plurality of sets of engine speed data. Then the order of engine speed data giving the maximum or minimum value within each set is obtained, and majority decision is effected to determine which order of data gives the maximum or minimum most frequently throughout all the sets. The difference between the maximum and minimum values is obtained for each set, and the amount of fuel to be supplied to the engine is controlled so that the difference becomes common to all the cylinders.