Abstract: An in-vehicle electronic control device for diagnosing the details of an abnormality of a microcomputer appropriately is provided. A monitoring function for detecting a malfunction by monitoring input/output of a main function of a hardware part and a monitoring function for detecting an abnormality by monitoring the calculating result of a main function in a software part are provided in a microcomputer. The main function to be monitored is implemented with a different structure than the malfunction/abnormality monitoring function. Furthermore, a malfunction processing circuit for monitoring an abnormality of the microcomputer is provided outside the microcomputer.

Abstract: An in-vehicle electronic control device for diagnosing the details of an abnormality of a microcomputer appropriately is provided. A monitoring function for detecting a malfunction by monitoring input/output of a main function of a hardware part and a monitoring function for detecting an abnormality by monitoring the calculating result of a main function in a software part are provided in a microcomputer. The main function to be monitored is implemented with a different structure than the malfunction/abnormality monitoring function. Furthermore, a malfunction processing circuit for monitoring an abnormality of the microcomputer is provided outside the microcomputer.

Abstract: An in-vehicle electronic control device for diagnosing the details of an abnormality of a microcomputer appropriately is provided. A monitoring function for detecting a malfunction by monitoring input/output of a main function of a hardware part and a monitoring function for detecting an abnormality by monitoring the calculating result of a main function in a software part are provided in a microcomputer. The main function to be monitored is implemented with a different structure than the malfunction/abnormality monitoring function. Furthermore, a malfunction processing circuit for monitoring an abnormality of the microcomputer is provided outside the microcomputer.

Abstract: An in-vehicle electronic control device for diagnosing the details of an abnormality of a microcomputer appropriately is provided. A monitoring function for detecting a malfunction by monitoring input/output of a main function of a hardware part and a monitoring function for detecting an abnormality by monitoring the calculating result of a main function in a software part are provided in a microcomputer. The main function to be monitored is implemented with a different structure than the malfunction/abnormality monitoring function. Furthermore, a malfunction processing circuit for monitoring an abnormality of the microcomputer is provided outside the microcomputer.

Abstract: An in-vehicle electronic control device for diagnosing the details of an abnormality of a microcomputer appropriately is provided. A monitoring function for detecting a malfunction by monitoring input/output of a main function of a hardware part and a monitoring function for detecting an abnormality by monitoring the calculating result of a main function in a software part are provided in a microcomputer. The main function to be monitored is implemented with a different structure than the malfunction/abnormality monitoring function. Furthermore, a malfunction processing circuit for monitoring an abnormality of the microcomputer is provided outside the microcomputer.

Abstract: An in-vehicle electronic control device for diagnosing the details of an abnormality of a microcomputer appropriately is provided. A monitoring function for detecting a malfunction by monitoring input/output of a main function of a hardware part and a monitoring function for detecting an abnormality by monitoring the calculating result of a main function in a software part are provided in a microcomputer. The main function to be monitored is implemented with a different structure than the malfunction/abnormality monitoring function. Furthermore, a malfunction processing circuit for monitoring an abnormality of the microcomputer is provided outside the microcomputer.

Abstract: The present invention provides a controller of an electric power steering device which does not apply an uncomfortable feeling to a operation of steering wheel while securing a fault determination confirming period enough long to prevent an erroneous detection of a torque sensor fault, and can secure a safety operation of steering wheel, even in the case that an output value of a torque sensor detecting a steering torque of a steering wheel becomes abnormal.

Abstract: The invention relates to a control apparatus of an electric power steering apparatus structured such as to apply a steering assist force generated by a n-phase motor to a steering system of a vehicle, the control apparatus is provided with at least (n?1) numbers of current detecting means for detecting a current Im in each of phases of the motor, a current command value calculating means for outputting a current command value Imref in each of the phases, and n numbers of current control means, and the control apparatus executes a current control of each of the phases by the current control means having the current command value Imref in each of the phases and the current Im in each of the phases as an input.

Abstract: An electric power steering apparatus includes a first torque command value calculating means that calculates a first torque command value on the basis of steering torque detected by a steering torque detecting means, a malfunction torque detecting means that detects malfunction of the steering torque detecting means, and a self aligning torque estimating means that estimates self aligning torque transmitted from a road surface to a steering mechanism, and the apparatus further includes a second torque command value calculating means that calculates a torque command value on the basis of the self aligning torque estimated by the self aligning torque estimating means, and an switching means that selects the second torque command value calculating means.

Abstract: The present invention includes a control part for controlling switching elements on diagonal lines in the upper and lower stage of an H bridge circuit respectively by different duty ratios based on a steering torque exerted on a steering system, and an electric power supply source for supplying an electric power. When the voltage of the electric power supply source is lower than a prescribed voltage, the control part causes the switching element EET 1 or FET2 on the upper-stage side to be driven by a pulse width modulation signal PWM1 or PWM2, the switching element FET 4 or FET3 on the lower-stage side to be turned on, and the frequency of the pulse width modulation signal to be lowered to an audible frequency range.

Abstract: In the present invention, only an abnormality of detection of a rotating direction of a motor is detected and therefore, with simple processing and by using a table for judging the abnormality of the detection of a rotating direction of a motor and the rotating direction of the motor, the abnormality of the detection of a rotating direction and the rotating direction of the motor are judged at one time.

Abstract: In order to solve a problem that a motor generates a noise so as to deteriorate an environment in a vehicle if a field weakening control is executed to the motor of a electric power steering apparatus, in the case that a vehicle speed is high, the same field weakening control as the conventional one is applied to the motor because a noise generated due to a friction between a tire and a road surface and a wind noise of a vehicle body are large, and in the case that the vehicle speed is low, the field weakening control is weakly applied in comparison with the conventional one because the noise generated by the motor is felt relatively largely. Accordingly, the field weakening control can be executed in response to the vehicle speed in such a manner as to make the motor noise smaller.

Abstract: Since an abnormality is judged by executing a square calculating process with respect to sin ? and cos ? for detecting an abnormality in an angular resolver, a processing time is elongated, and a burden to a CPU is great. Since the invention prepares a map which can judge whether the combination of sin ? and cos ? is normal or abnormal, and judges by mapping the combination of the detected sin ? and cos ?, a process can be easily executed, a processing speed is high, and a burden to the CPU can be reduced. Further, an assist can be maintained by controlling a motor by a rectangular wave current by detecting a rotation angle signal at low resolution level, such as Hall sensors arranged around the motor.

Abstract: An initial abnormality analysis data is reliably retained by a controller of an electric power steering apparatus.

Abstract: An electric power steering apparatus has a steering mechanism SM having universal joints 4, 6 in a torque transmitting system, a steering toque detecting unit 14, a steering angle detecting unit 18, a torque fluctuation detecting unit 43 for detecting a torque fluctuation due to the crossing angle ? in the universal joints 4, 6 on the basis of the steering angle ? detected by the steering angle detecting unit 18 and any one of the steering torque T detected by the steering torque detecting unit, a current command value It and self-aligning torque SAT; and a current command value correcting unit 44 for correcting the current command value on the basis of the torque fluctuation detected by the torque fluctuation detecting unit 43 and the steering angle ? detected by the steering angle detecting unit 18.

Abstract: A computed SAT value SATa is computed, and an estimated SAT value SATb is estimated from lateral force. A grip loss level “g” is computed from difference between the computed self aligning torque value SATA and the estimated SAT value SATb. Torque correction value ?T which becomes greater with an increase in grip loss level “g” and an increase in angular speed ? is set in accordance with the grip loss level “g” and the angular speed ? of an electric motor 12 serving as corresponding steering angular speed. The corresponding torque correction value ?T is subtracted from the current command value Itv responsive to the steering torque T and the vehicle speed V, thereby correcting the current command value Itv. The thus-corrected current command value Itv is taken as a steering assist command value Im, and the electric motor 12 is driven based on the steering assist command value.

Abstract: In a control apparatus of an electric power steering apparatus constructed so as to calculate a current command value of a motor for applying steering assist force to a steering mechanism based on steering torque and a vehicle speed and drive and control the motor based on the current command value, there are provided an SAT detection part for detecting or estimating an SAT detection value, a standard SAT calculation part for calculating a standard SAT value based on a steering angle and the vehicle speed, and a correction part for calculating a correction amount based on the SAT detection value and the standard SAT value and correcting the current command value.

Abstract: The present invention includes a control part for controlling switching elements on diagonal lines in the upper and lower stage of an H bridge circuit respectively by different duty ratios based on a steering torque exerted on a steering system, and an electric power supply source for supplying an electric power. When the voltage of the electric power supply source is lower than a prescribed voltage, the control part causes the switching element EET 1 or FET 2 on the upper-stage side to be driven by a pulse width modulation signal PWM1 or PWM2, the switching element FET 4 or FET3 on the lower-stage side to be turned on, and the frequency of the pulse width modulation signal to be lowered to an audible frequency range.

Abstract: The present invention provides an excellent electric power steering apparatus in which torque ripple caused by a quantization error of a current control system generated in case of slow steering state and steering holding state, namely, vibration and noise on a steering wheel can be suppressed. A current controller in which a steady state gain of feedback control is a finite value is used so as to be capable of suppressing the vibration and noise. Further, according to the present invention, a smoothing filter is included in a current control system so that the quantization error is smoothed so that the torque ripple is suppressed.

Abstract: Since an abnormality is judged by executing a square calculating process with respect to sin ? and cos ? for detecting an abnormality in an angular resolver, a processing time is elongated, and a burden to a CPU is great. Since the invention prepares a map which can judge whether the combination of sin ? and cos ? is normal or abnormal, and judges by mapping the combination of the detected sin ? and cos ?, a process can be easily executed, a processing speed is high, and a burden to the CPU can be reduced. Further, an assist can be maintained by controlling a motor by a rectangular wave current by detecting a rotation angle signal at low resolution level, such as Hall sensors arranged around the motor.