Abstract: An on-vehicle engine control apparatus carries out engine drive control and throttle control using one single CPU and improves safety. The apparatus includes a load relay for feeding a power to a motor that controls throttle valve opening, a first IC (integrated circuit element) containing a CPU, and a second IC connected to the first IC via serial interfaces. The apparatus further includes a first mutual diagnostic device incorporated in the first IC and diagnoses operation of the second IC, a second mutual diagnostic device incorporated in the second IC to diagnoses operation of the first IC, and a detector for detecting an abnormality in operation of each system involved in throttle valve control. Operation of the load relay is controlled based on diagnostic results and abnormality detection results of the first and second mutual diagnostic devices.

Abstract: Evacuation operation performance is improved when any abnormality occurs in an electronic throttle control system. When any serious abnormality occurs, a first abnormality storage element (133) operates, a load relay for a power supply circuit (104a) of a throttle valve open/close controlling motor (103) is de-energized to operate a first alarm and display (109a). Thus a first device carries out the evacuation operation by a fuel cut control. When any slight abnormality occurs, a second abnormality storing element (136) comes to actuate thereby a second alarm and display (109b) being operated. Thus a second device carries out the evacuation operation using together a throttle valve opening control by the motor 103 and the fuel cut control.

Abstract: A drive control circuit generates a conduction drive output responsive to a detection output of an accelerator pedal depression degree sensor and an air-intake throttle-valve opening sensor, and controls a driving switch element connected to an air-intake throttle-valve opening control motor. A monitoring control circuit drives a control circuit power supply interruption element that closes a control power supply circuit of the driving switch element, and stops control operation of the driving switch element by a conduction-inhibit output. The drive control circuit can stop operation of a power supply interruption element by a feed-inhibit output. At the time of starting operation, a status signal determines activeness of the feed-inhibit output and conduction-inhibit output, after confirming that those outputs are normal, the inhibition is released.

Abstract: To miniaturize and standardize an on-vehicle electronic controller by improving an input filter circuit in the device. Direct input interface circuits and a direct output interface circuit are connected to a data bus of a microprocessor, which has a nonvolatile memory for storing a control program and so on and a RAM memory for computing. ON/OFF signals inputted from indirect input interface circuits are transmitted to the RAM memory via a variable filter circuit, in which a filter constant is set by a constant setting register, and interactive serial communication circuits. A filter constant stored in the nonvolatile memory is stored in the constant setting register via the interactive serial communication circuits.

Abstract: An engine control system provides a gas concentration detection output irrespective of variation in product or change due to passage of time using an on-vehicle exhaust gas sensor. An exhaust gas sensor 107 and an electric heater 119 are connected to a microprocessor 120a, and an oxygen-concentration detection output Ip of exhaust gas, a calibration signal Vc and an internal resistance detection signal Vr are inputted through A/D converter 125. A program memory 121a stores standard characteristic data of the exhaust gas sensor 107. An atmospheric air oxygen-concentration detection output Ip0 under fuel-cut drive is measured and monitored. The electric heater 119 controls temperature so that the output coincides with the stored value. Current internal resistance of the exhaust gas sensor 107 is read and stored as target resistance. In normal driving, the electric heater 119 is controlled so that the internal resistance becomes the target resistance.

Abstract: An IC element 20a provided with input-output interface circuits 23, 24 and a control circuit 22a includes: a constant voltage control circuit 21a comprising a switching circuit 25a for conduction control of a switching element 11a connected to a power supply terminal 2a of an on-vehicle electronic control device 1a; and a comparison circuit 26 for opening the switching element 11a when a voltage of the first terminal Vdd1, to which an output voltage of the switching element 11a is supplied, is below a predetermined value; in which the input-output interface circuits 23, 24 is supplied with power from the first terminal Vdd1, while the control circuit 22a is supplied with power from the second terminal Vdd2 connected to an output circuit of the switching element 11a.

Abstract: A vehicular electronic control apparatus is provided with a program memory, a data memory, a RAM, a microprocesser, a reference data storage memory, a data memory abnormality judging section, and at least two transfer sections for a RAM. The reference data storage memory stores reference data corresponding to variable control data stored in the data memory. The data memory abnormality judging section judges whether the variable control data stored in the data memory are normal or abnormal. The first transfer section transfers and writes the variable control data from the data memory to the RAM. The second transfer section writes estimated variable control data based on the reference data from the reference data storage memory to the RAM.

Abstract: Escape running performance at the time of the occurrence of an abnormality in an electronic throttle control system is improved. At the time of the occurrence of a severe abnormality, an abnormality storage element is operated, and an electric supply load relay of a throttle valve driving motor is de-energized to return a throttle valve to the default, and further, an alarm display is actuated, and an upper limit engine rotational speed is suppressed by control of a fuel injection valve, and escape running is carried out. As a suppression rotational speed, a lower limit threshold at a stop, a rotational speed substantially in proportion to the output of an accelerator position sensor, a rotational speed substantially in inverse proportion to the output of a throttle position sensor, or a default threshold rotational speed is selected, and multiple escape running can be carried out.

Abstract: A core integrated circuit device has a microprocessor. A first ancillary integrated circuit device has an indirect parallel input circuit that receives low-speed digital signals parallel, and the first ancillary integrated circuit device outputs the received digital signals serially to the core integrated circuit device. A second ancillary integrated circuit device has a multi-channel A/D converter that receives analog signals parallel and converts those into digital signals, and the second ancillary integrated circuit device outputs the digital signals serially to the core integrated circuit device. The core integrated circuit device generates control signals based on the received signals and outputs the control signals to control object devices.

Abstract: Intake air quantity control system, for internal combustion engine, ensuring improved response behaviors incorporates an abnormality supervisor and a fail-safe controller in a duplex CPU system configuration. System includes throttle valve control motor, engine driving machinery, load relay for supplying electric power to a throttle valve, peripheral auxiliary equipment, an alarm display device, main CPU for controlling the throttle valve control motor and the engine driving machinery, subsidiary CPU for controlling a load relay and the peripheral auxiliary equipment through cooperation with the main CPU, sensor groups and, serial interfaces for enabling signals to be transferred between the main CPU and the subsidiary CPU, and an abnormal event storage device for electrically deenergizing the load relay while electrically energizing the alarm display device.

Abstract: The invention relates to an on-vehicle electronic controller and intends to lighten the burden on a microprocessor in processing input and output of the controller and miniaturize and standardize the controller. A plurality of ON/OFF data inputted from indirect input interface circuits are transmitted to a RAM memory via a variable filter circuit and a two-way serial communication circuit. A filter constant of the variable filter circuit is set by a constant setting register, and a filter constant stored in the nonvolatile memory is stored in the constant setting register via two-way serial communication circuit.

Abstract: In a vehicle built-in electronic control apparatus, second control programs are written, second RAM memory for calculation processing and second input/output ports, and a serial-parallel converter for full duplex two-way serial communication for mutually conducting data communications between the main CPU and the sub CPU in operation of the controlled vehicle, and at the time of starting operation of the controlled vehicle, a part of the control constants stored in the first nonvolatile memory is transferred to the second RAM memory through the serial-parallel converter for the serial communication and the sub CPU performs predetermined calculation based on the contents of the second control programs of the second nonvolatile memory and the contents of the control constants transferred to the second RAM memory.

Abstract: Escape running performance at the time of the occurrence of an abnormality in an electronic throttle control system is improved. At the time of the occurrence of a severe abnormality, an abnormality storage element is operated, and an electric supply load relay of a throttle valve driving motor is de-energized to return a throttle valve to the default, and further, an alarm display is actuated, and an upper limit engine rotational speed is suppressed by control of a fuel injection valve, and escape running is carried out. As a suppression rotational speed, a lower limit threshold at a stop, a rotational speed substantially in proportion to the output of an accelerator position sensor, a rotational speed substantially in inverse proportion to the output of a throttle position sensor, or a default threshold rotational speed is selected, and multiple escape running can be carried out.

Abstract: An on-vehicle engine control apparatus carries out engine drive control and throttle control using one single CPU and improves safety. The apparatus includes a load relay for feeding a power to a motor that controls throttle valve opening, a first IC (integrated circuit element) containing a CPU, and a second IC connected to the first IC via serial interfaces. The apparatus further includes a first mutual diagnostic device incorporated in the first IC and diagnoses operation of the second IC, a second mutual diagnostic device incorporated in the second IC to diagnoses operation of the first IC, and a detector for detecting an abnormality in operation of each system involved in throttle valve control. Operation of the load relay is controlled based on diagnostic results and abnormality detection results of the first and second mutual diagnostic devices.

Abstract: The invention relates to an on-vehicle electronic controller and intends to lighten the burden on a microprocessor in processing input and output of the controller and miniaturize and standardize the controller. A plurality of ON/OFF data inputted from indirect input interface circuits are transmitted to a RAM memory via a variable filter circuit and a two-way serial communication circuit. A filter constant of the variable filter circuit is set by a constant setting register, and a filter constant stored in the nonvolatile memory is stored in the constant setting register via two-way serial communication circuit.

Abstract: A vehicle-mounted electronic control apparatus comprises: a main CPU including a first nonvolatile memory in which at least control programs and control constants, in correspondence with types of controlled vehicles, transmitted from an external tool are written, the main CPU including a first RAM for calculation processing; a sub CPU including a second nonvolatile memory in which programs for input/output processing are written and a second RAM for calculation processing; and a serial-parallel converter for serial communication adapted to transmit a plurality of input signals, which are input to the sub CPU, to the main CPU, wherein a plurality of filter constants corresponding to the plurality of input signals are stored in at least one of the first and second nonvolatile memory; and the sub CPU has a digital filter section adapted to perform predetermined calculation based on the filter constants to transmit a result of the calculation to the main CPU.

Abstract: A core integrated circuit device has a microprocessor. A first ancillary integrated circuit device has an indirect parallel input circuit that receives low-speed digital signals parallel, and the first ancillary integrated circuit device outputs the received digital signals serially to the core integrated circuit device. A second ancillary integrated circuit device has a multi-channel A/D converter that receives analog signals parallel and converts those into digital signals, and the second ancillary integrated circuit device outputs the digital signals serially to the core integrated circuit device. The core integrated circuit device generates control signals based on the received signals and outputs the control signals to control object devices.

Abstract: Evacuation operation performance is improved when any abnormality occurs in an electronic throttle control system.

Abstract: An IC element 20a provided with input-output interface circuits 23, 24 and a control circuit 22a includes: a constant voltage control circuit 21a comprising a switching circuit 25a for conduction control of a switching element 11a connected to a power supply terminal 2a of an on-vehicle electronic control device 1a; and a comparison circuit 26 for opening the switching element 11a when a voltage of the first terminal Vdd1, to which an output voltage of the switching element 11a is supplied, is below a predetermined value; in which the input-output interface circuits 23, 24 is supplied with power from the first terminal Vdd1, while the control circuit 22a is supplied with power from the second terminal Vdd2 connected to an output circuit of the switching element 11a.

Abstract: A microprocessor runaway monitoring control circuit with which self-diagnosis of a watchdog timer WDT can be carried out safely and cheaply even during operation of the microprocessor (CPU). A microprocessor 101 supplies first and second watchdog clearing signals WD1 and WD2 to first and second watchdog timers WDT1 and WDT2, and when the both of the watchdog clearing signals WD1 and WD2 stop, the microprocessor 101 is reset by way of a logical connector circuit 122. The microprocessor 101 has failure diagnosing means 103 which intentionally stops the first watchdog clearing signal WD1 and diagnoses the response of the first watchdog timer WDT1 on the basis of a monitor signal MN1 and stops the second watchdog clearing signal WD2 and diagnoses the response of the second watchdog timer WDT2 on the basis of a monitor signal MN2, whereby diagnosis of the watchdog timers WDT1, WDT2 is carried out without the microprocessor 101 being stopped.