Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Mitsubishi Denki Kabushiki Kasiha

Akihiro Ishii

Yuki Iwagami

Kohji Hashimoto

Katsuya Nakamoto

Yuji Zushi

Shoso Tsunekazu

Shinsuke Suzuki

Koji Hashimoto

Manabu Yamashita

Mitsunori Nishida

Osamu Nishizawa

Susumu Tanaka

A first external tool (A) serially connected to an electronic controller (A) through a pair of communication lines (LANH, LANN) applies a high voltage (Vaa) higher than a normal control voltage (Vcc) to the communication line (LANH) when a program is written. The electronic controller (A) recognizes connection of the first external tool (A) by a comparison circuit (A) for monitoring a received voltage and a write-mode determination circuit (A), initializes a microprocessor (), and receives and stores an total control program (TCPRG) in a program memory (A) based on a content of a boot program memory (). During an operation of the electronic controller (A), the external tool (A) is removed and the high voltage (Vaa) is not applied to the communication line (LANH). Therefore, the electronic control apparatus is not erroneously placed in the write mode.

Electronic controller to be connected to program tool

Provided is a drive control device capable of surely detecting, by a monitoring/controlling unit, an abnormality of a short circuit and a disconnection in a power supply circuit to an electric load, and of decreasing a load required for a quick response imposed on the monitoring/controlling unit. A switching element is controlled to open/close by a control output signal generated by a monitoring/controlling unit, and a determination storing circuit determines whether circuit opening and circuit closing have been correctly carried out and stores a result of the determination, and periodically reports to the monitoring/controlling unit. While the stored content of the determination is periodically reset, the determination operation is updated and continues. The monitoring/controlling unit does not need to immediately monitor the determination storing signal when the open/closing command is generated.

Drive control device for an electric load

An electronic control apparatusA is configured in such a way that a CPUA reads the conduction current of an opening/closing devicein an IPMA, by way of serial-parallel convertersandand a second multi-channel A/D converter; the opening/closing deviceis opening/closing-controlled through a serial control signal SRn or a parallel control signal PWMn; and a reading timing control circuitadjusts the reading timing in such a way that, regardless of the kind of the control signal, reading is performed during the period in which the opening/closing deviceis driven to be closed. As a result, the serial-parallel converter can reduce the number of wiring leads between the IPM and the microprocessor, and the digital conversion value is accurately read, by adjusting the error between the serial-signal timing and the parallel-signal timing.

Electronic control apparatus

An in-vehicle electronic control apparatus, having a monitoring control circuit, according to the present invention is configured in such a way that serial interface circuitsandare connected between a main control circuit unitA and a monitoring control circuit unitA, high-speed full-duplex block communication is performed by use of a communication permission signal ALT and a communication synchronization signal CLK, the same question information included in uplink communication information UPD is recurrently transmitted in a plurality times of communication and updated after being transmitted a predetermined times, and the main control circuit unitA returns answer information by use of downlink communication information DND, within a predetermined duration after the update of the question information; because the question update period is prolonged, the control load on the main control circuit unitA is reduced.

In-vehicle electronic control apparatus having monitoring control circuit

A first control circuit section (master station) and a second control circuit section (substation) communicate with each other via series-parallel converters. The master station includes regular transmission device and transmission-permitting signal generation device; and the sub station includes regular report device, confirmation reply device relative to a transmission data from the master station, and an unprocessed data table. The unprocessed data table prevents jam-up in upstream communication from the sub station to the master station, enabling to carry out timely regular transmission and regular reporting. Transmission from the sub station to the master station is performed based on a transmission-permitting control signal that the master station generates. Consequently, it is possible to execute communication error processing and diminish communication control burden on the master station while properly performing the regular transmission and regular report between the master station and sub station.

Electronic control unit

In an electronic control unit, a control constant stored in a program memory is transmitted to a data memory via a serial communication circuit. First control circuit section (master station) and second control circuit section (substation) mutually communicate through series-parallel converters. The master station includes regular transmission device and storage constant confirmation processing device. The substation includes regular report device and confirmation reply device to a data transmitted from the master station. A constant set data transmitted from the master station by regular transmission device is stored in the data memory at the time of normal receiving. Confirmation information such as sum value of the entire data in the data memory is reported by regular report device. At the master station, if there is any error in the confirmation information, a constant set data is retransmitted with regular transmission device. Reliability of data in the data memory is improved.

First and second control circuit sections that mutually communicate via a series-parallel converter comprise first and second adder-subtracter respectively. When any receiving error occurs in each control circuit section, a variation valueis added to the adder-subtracter on the receiving side. When data is normally received, a variation valueis subtracted from the adder-subtracter. Initial value of the adder-subtracter is set to 9. When a current value exceeds 11, first and second error detection signal is generated to carry out alarm display or initialization, and initialization and restart of the other-side control circuit section.

An electronic control unit includes a serial communication circuit capable of easily confirming presence or absence of communication error while regular transmission/regular report between master station and sub station are performed timely. First and second control circuit sections(master station) and(substation) communicate mutually via series-parallel converters. The master station includes regular transmission deviceand irregular transmission device. The substation includes regular report device, confirmation reply deviceand report reply devicerelative to transmission data from the master station, and unprocessed data table. The confirmation reply deviceand report reply deviceconfirm whether or not downstream communication from the master station to sub station is normal. When any error is present in regular report data through upstream communication, the error is confirmed on the fact the irregular transmission devicemakes retransmission readout request.

Power generation by an alternator is controlled by switching a target charging voltage by a signal from an engine control unit so that engine-starting characteristics when the engine starts are prevented from deterioration due to the load of the alternator. The circuit initiates the generation by the alternator according to a gradual excitation control signal when the engine starts and makes the alternator generate according to a prohibit-power-generation signal after the completion of the starting.

Alternator controller

A fuel injection amount controller for engines capable of decreasing the shocks caused by the correction of increasing or decreasing the amount of fuel at the time of changing over the operation mode. The fuel injection amount controller includes an operation condition detector for detecting the operation conditions of an engine inclusive of an intake pipe pressure and a crank angle. An air-to-fuel ratio controller controls the air-to-fuel ratio of the engine to a ratio more lean than stoichiometric when operation conditions represent a predetermined operation condition. A pressure deviation detector calculates a pressure deviation in the intake pipe pressure within a predetermined period of time or between predetermined crank angles. A fuel amount correction device injects the fuel in an amount corresponding to the pressure deviation when the deviation is not smaller than a predetermined value. A correction coefficient change-over device changes a correction coefficient for the amount of fuel over to a suppressing direction in response to a timing for changing the operation condition at the stoichiometric air-to-fuel ratio and the operation condition at the lean air-to-fuel ratio over to each other.

Growing community of inventors

Chiyoda-ku, Japan

Akihiro Ishii