Abstract: Provided is an on-vehicle control apparatus capable of automatically initializing control variables in a backup RAM only in rewriting a control program in the market. The on-vehicle control apparatus includes a CPU for controlling an on-vehicle device according to a control program, a non-volatile ROM for storing the control program therein, a backup RAM for storing control variables therein, a backup power supply circuit for supplying power to the backup RAM, a boot program for rewriting the control program, an address changeover circuit for making a changeover in execution address, and a memory rewrite unit. The memory rewrite unit outputs a rewrite signal, a command signal group including a command for activating the boot program, and an erasure command signal for erasing a diagnostic code. The control program initializes the control variables in the backup RAM in response to the erasure command signal when being activated after having been rewritten.

Abstract: An ignition timing control apparatus for an internal combustion engine is provided which is capable of preventing the generation of knocking immediately after an intake air control valve is driven to operate. An intake air control valve (23) is provided in an intake passage (5) of an engine (1). A swirl control element (10) controls the opening and closing of the intake air control valve in accordance with operating conditions of the engine thereby to adjust a magnitude of an intake air swirl. An ignition timing calculating element (10) determines ignition timing of the engine through interpolation using ignition timing map data corresponding to the number of revolutions per unit time of the engine and an engine load. A map data setting element (10) switches and sets the ignition timing map data in accordance with opening and closing of the intake air control valve (23).

Abstract: An ignition timing control apparatus for an internal combustion engine is provided which is capable of preventing the generation of knocking immediately after an intake air control valve is driven to operate. An intake air control valve (23) is provided in an intake passage (5) of an engine (1). A swirl control element (10) controls the opening and closing of the intake air control valve in accordance with operating conditions of the engine thereby to adjust a magnitude of an intake air swirl. An ignition timing calculating element (10) determines ignition timing of the engine through interpolation using ignition timing map data corresponding to the number of revolutions per unit time of the engine and an engine load. A map data setting element (10) switches and sets the ignition timing map data in accordance with opening and closing of the intake air control valve (23).

Abstract: A main sensor 101a and a subsensor 101b are two sensors adapted to operate in the same direction. A voltage of the same polarity is applied to both the sensors 101a and 101b from a common power supply of a voltage application 100. Then, an offset 103 causes an output value of the subsensor 101b to deviate from an output value of the main sensor 101a by a predetermined value. When the difference between outputs of both the sensors is outside a predetermined range, an abnormality decision 102 decides that an anomaly occurs in the sensor.

Abstract: An automotive controller permits easy reading of a program identification code in a ROM without the need for using any special readout device. The automotive controller is equipped with: a processing unit (10) which has various sensors (3a, 5 through 7, 31) for supplying various types of data indicative of the operational state of a motorcar, a RAM (103), and a ROM (102), and which performs arithmetic processing on the data; and output devices (4, 11) driven according to the operation results given by the processing unit. Stored in advance in the ROM are the set values matched to predetermined conditions of the operational states, and program identification codes keyed to the contents of programs. The output devices include an output unit (111) for displaying the program identification codes. The processing unit enables the program identification codes in the ROM to be displayed on the output device only when the data indicating the operation states agrees with the present values.

Abstract: An improvement to a controller of a step motor for a by-pass valve of an internal combustion engine is disclosed. After the engine is shut off, the valve is initialized to obtain accurate correspondence between the controller, the step motor, and the valve's position. The valve is first driven to a maximum open position. Thereafter, the valve is driven to a target position. In addition, a motor excitation pattern which the controller generates upon resetting is stored in a memory. According to one embodiment, the amount of motor rotation for reaching the target position is so determined that the last excitation pattern delivered to the motor matches the excitation pattern stored in the memory. According to another embodiment, a stopper is provided on the valve at the fully open position. After the engine is turned off, the motor is first energized to bring the valve against the stopper. Thereafter the motor is energized in the direction surpassing the fully open position.

Abstract: A controller for an automotive engine sets an activation time T when the key switch of the vehicle is turned on, and controls the radiator fan 8 and the fuel pump 10 for the set activation time after the key switch is turned off, such that the temperature rise of the fuel within the injectors and the generation of vapor therein at the restart of the engine is prevented. The activation time T is set at a predetermined positive value when the coolant water temperature is higher than a predetermined level, and at 0 otherwise (FIG. 2). Alternatively, the activation time T may be set at a value which depends on the sensed coolant water temperature (FIG. 3). Still alternatively, after the key switch is turned off, the radiator fan 8 and the fuel pump 10 may be controlled until the measured coolant water temperature falls below a predetermined level (FIG. 4).

Abstract: In a fuel control apparatus for an n-cycle engine, when a cylinder discriminating means detects a value obtained by counting turning angle position signals is out a predetermined range, or when a detecting means detects that data of cylinder do not have values according to a predetermined order, a fuel-injection control means performs simultaneous injection of fuel to all cylinders, and thereafter the fuel injection is prohibited until the cylinder discriminating means detects a specified cylinder among the six cylinders.