摘要:
In a vehicle electromagnetic clutch control device, clutch current calculating means outputs a clutch current analog signal according to given travel control data and engine control data, a current difference detector obtains the difference between the clutch current analog signal and a clutch current feedback signal, a first output transistor is operated according to the difference thus obtained to energize the electromagnetic clutch, the clutch current flowing in a second output transistor is detected with a current detecting resistor, and a voltage corresponding to the clutch current thus detected is applied to an operational amplifier, so as to output the clutch current feedback signal with the aid of a reference resistor, a feedback resistor and the amplification factor thereof. An adjusting resistor is connected in parallel to the reference resistor, to adjust the clutch current. Thus, the adjustment of the clutch current can be achieved without removal of the reference resistor and the feedback resistor from the printed circuit board.
摘要:
A current control apparatus for an electric load can prevent burnout at a short-circuit accident with high control precision. A switching element is interrupted by an overcurrent detection circuit upon occurrence of a load short circuit, but is transitionally limited in current by a current detection resistor. A differential amplifier amplifies a difference voltage between voltages at opposite ends of the current detection resistor to generate a monitored voltage Ef corresponding to a load current. A microprocessor controls the energization rate of the switching element so as to make an estimated load current Ime calculated from the monitored voltage Ef coincide with a target load current Is, and it calculates, upon calibration operation, calibration constants and estimates, during actual operation, a load current Ime from the monitored voltage Ef using the calibration constants.
摘要:
Provided is a small and low-cost resin-sealed electronic control device including a first electronic board and a second electronic board respectively bonded onto an upper surface and a lower surface of a support plate, each of the first electronic board and the second electronic board having an increased mounting area on which circuit components are mounted. A first electronic board (30A) and a second electronic board (40A) respectively bonded onto an upper surface and a lower surface of a support plate (20A) include outer circuit components (31, 41) and inner circuit components (33, 43) respectively mounted on outer surfaces and inner surfaces thereof. The inner circuit components (33, 43) are fitted into a window hole portion (21) of the support plate (20A) and are sealed with a filler (25).
摘要:
Provided is a resin-sealed electronic control device reduced in size, which includes a double-sided mounting board as at least one of a plurality of electronic boards obtained by division so that a large mounting surface with a small plane area is ensured. Each of a first electronic board (30A) and a second electronic board (40A) bonded onto an upper surface and a lower surface of each of a pair of separate beam members (20A) includes two surfaces on which outer circuit components (31, 32, 41, 42) and an inner circuit component (33, 43) are respectively mounted. A height of each of the inner circuit components is equal to or less than a thickness of each of the separate beam members (20A). Heat-generating components (32, 42) in the outer circuit components are provided to be adjacent to and opposed to the separate beam members (20A).
摘要:
A resin-sealed electronic controller obtained by bonding and fixing a circuit board to a thermally-conductive base plate, and integrating circuit components with a molding resin so as to reduce the size. A base plate includes a first exposed portion, a second exposed portion, and an adjacent flat portion adjacent to a central window hole. First circuit components which are low-heat-generating components with large height are located in the central window hole. Second circuit components which are high-heat-generating components with small height are provided on an area corresponding to the adjacent flat portion. A height dimension of the first circuit components at least partially overlaps a thickness dimension of the base plate, to reduce a total thickness dimension. The high-heat-generating components and the low-heat-generating components being provided separately from each other permits increased mounting density of low-heat-generating components, reducing an area of the circuit board.
摘要:
A linear solenoid is configured with an electromagnetic coil and a label resistor that are integrated with each other; the label resistor has a resistance value corresponding to a correction coefficient based on the difference between the actual characteristic of the supply current vs. adjusted hydraulic pressure output of the electromagnetic coil and a standard characteristic; and data for correcting a characteristic variation in the command current vs. output current characteristic of an electromagnetic coil is preliminarily stored in a control module by use of an adjustment tool. When the operation is started, the resistance value of the label resistor is read and an output current corresponding to a utilized linear solenoid is supplied, so that a target adjusted hydraulic pressure is obtained.
摘要:
A standard characteristic which is an average characteristic of multiple samples is approximated in a polygonal-line fashion by first to third lines. The coordinate-point positions of the first and second lines at comparison adjustment points are stored as standard data in a data memory of an electronic control apparatus. An actual-product characteristic as a calibration target is approximated in a polygonal-line fashion by first to third lines. The resistance value of a label resistor is adjusted to a value corresponding to ratios of monitoring outputs. The electronic control apparatus reads the resistance values of one or two label resistors, combines them with the stored standard characteristic, and interpolates a third line portion, thereby restoring and generating the actual-product characteristic.
摘要:
Provided is a small resin-sealed electronic control device with a reduced plane area and volume, which can provide an enlarged area on which circuit components are mounted without increasing a plane area of electronic boards. In the resin-sealed electronic control device, a support member (20A) includes a first support plate (21a), a second support plate (22a), and a pair of rising portions (23a) which form a space portion with a first electronic board (30A) and a second electronic board (40A). An exterior covering material (11) is formed by injecting a melted synthetic resin into the space portion and spaces outside the space portion along the pair of rising portions (23a). Inner circuit components (33) are situated inside window holes formed through the support plate (20A) and face one of the first electronic board (30A) and the second electronic board (40A) opposed to each other with a gap interposed therebetween.
摘要:
A current control apparatus for an electric load can prevent burnout at a short-circuit accident with high control precision. A switching element is interrupted by an overcurrent detection circuit upon occurrence of a load short circuit, but is transitionally limited in current by a current detection resistor. A differential amplifier amplifies a difference voltage between voltages at opposite ends of the current detection resistor to generate a monitored voltage Ef corresponding to a load current. A microprocessor controls the energization rate of the switching element so as to make an estimated load current Ime calculated from the monitored voltage Ef coincide with a target load current Is, and it calculates, upon calibration operation, calibration constants and estimates, during actual operation, a load current Ime from the monitored voltage Ef using the calibration constants.