Abstract: An engine control apparatus for shifting an ignition timing signal to an ignition coil (48) so that the engine produces optimum torque generates a pseudo random signal (26) which is preferably an M series signal and applies the pseudo random signal to a parameter of the engine having a noise frequency component such as the engine rotational speed y(t). The M series signal is a signal having a impulse type self correlation function. A mutual correlation function of the number of revolutions of the internal combustion engine and of the M series signal is computed (30-44) and an optimum ignition advance angle is supplied to an adder (46). The adder (46) combines the optimized signal ignition advance angle with a basic ignition timing signal (.theta..sub.advB) to provide an ignition timing signal (.theta.ig) to the ignition coil (48).

Abstract: A system and method for self diagnosing an engine controlling system such as an ignition system, fuel injection system, and an EGR (Exhaust Gas Recirculation) system are disclosed in which a periodic pseudo random signal is superposed on a control signal such as an ignition signal, fuel injection signal, or EGR rate controlled value indicating signal during an engine steady state condition, a cross-correlation function is calculated from both the superposed periodic random signal and output signal related to deterioration of the engine controlling system, and a value related to the cross-correlation function is compared with a reference value over which a performance of the engine controlling system cannot be maintained. If the value related to the cross-correlation function exceeds the reference value, the diagnostic system determines the occurrence of deterioration in the engine controlling system.

Abstract: The present specification discloses a diagnosis system and an optimum control unit for an internal combustion engine. The basic concept of the present invention resides in that a random retrieved signal of which auto correlation function is an impulse shape is superposed on a signal of an internal combustion engine, said superposed signal is used to measure a change of an operation state of the internal combustion engine, and an optimum direction of a control value is detected by a correlation between said measured value and retrieved signal.

Abstract: A control device for an automobile capable of changing the relationship between the driver's input and the controlled variable of the automobile by the driver's individual characteristics so as to characterize the automobile.

Abstract: The present specification discloses a diagnosis system and an optimum control unit for an internal combustion engine. The basic concept of the present invention resides in that a random retrieved signal of which auto correlation function is an impulse shape is superposed on a signal of an internal combustion engine, said superposed signal is used to measure a change of an operation state of the internal combustion engine, and an optimum direction of a control value is detected by a correlation between said measured value and retrieved signal.

Abstract: A car control apparatus in which correction characteristics indicating whether or not various control constants are proper or not are calculated through loop control of one of the car's operation parameters, such as the air-fuel ratio, on the basis of the air-fuel ratio correction factors subjected to learning to thereby rationalize the control constants such as the fundamental injection time so as to realize proper fuel injection and proper ignition timing control.

Abstract: An engine controller equipped with a device for judging occurrence of knocking of the engine, having a sensor for sampling a vibration based on an internal pressure vibration arisen in a cylinder of the engine and a knocking detecting means for judging the occurrence of the knocking by obtaining at least two frequencies contained in an output from the sensor, obtaining a knocking judgement index from two vibration power factors corresponding to the two frequencies and comparing the knocking judgement index with a threshold value. As being judged from the knocking judgement index, the occurrence of the knocking is accurately detected when the background vibration is great at the time of the high load high speed operation.

Abstract: An engine control system is disclosed in which the air-fuel ratio is controlled by feedback in accordance with the oxygen concentration detected of the exhaust gas, and a feedback control system thereof separate learning compensation values for compensating for the changes of the input/output characteristics of an air flow meter and a fuel injector respectively.

Abstract: A control system for the internal combustion engine is disclosed, in which the operating conditions (such as vehicle speed) and the control conditions (such as throttle opening degree) of the operating elements of the internal combustion engine are used to determine a resistance index (such as an equivalent gradient) for specifying the driving force corresponding to the operating conditions under the prevailing load conditions. Further, this resistance index data is accumulated, so that the operating elements are controlled on the basis of a target operating condition and a corresponding resistance index.

Abstract: A throttle control apparatus of an internal combustion engine comprises an accelerator opening detector, an engine revolution speed detector, a throttle actuator and a control unit constructed so as to generate and output, to the throttle actuator, a throttle driving signal for operating the throttle valve according to a throttle opening pattern determined on the basis of an accelerator opening, an accelerator opening speed and engine revolution speed, the throttle opening pattern includes a first target opening to which throttle valve is opened upon a rapid accelerator operation and which is determined according to an accelerator depression quantity, an accelerator depression speed and an engine revolution speed, a second target opening to which said throttle valve is opened after a predetermined time lapsed from the starting of the rapid accelerator depression and which is determined according to an accelerator depression quantity, an accelerator depression speed and an engine revolution speed.

Abstract: In order to provide information for searching for a desired destination on the basis of the purpose of use of a facility at that destination and for selecting an optimum destination out of several candidates for a distination at which are located facilities having the same purpose of use an automobile driving guide apparatus is so configured that search information indicating the relations between the purposes of use and various destinations which satisfy that purpose is memorized in memory means, and candidates for a desired destination are indicated on a display when the driver inputs a purpose of use and a destination is indicated on the display when the driver selects and inputs a selected destination.

Abstract: A method for feedback controlling air-fuel ratio of the mixture supplied to an internal combustion engine having a plurality of cylinders comprises the steps of, detecting respective air-fuel ratios of the exhaust gas from the respective cylinders with an air-fuel ratio sensor having a substantially linear output characteristic; calculating an average air-fuel ratio by using the latest detected air-fuel ratios of the respective cylinders; determining a fundamental feedback correction coefficient .beta..sub.0 for a cylinder of which air fuel ratio is feedback controlled next; retrieving a learning correction coefficient .beta..sub.1 for the cylinder of which air-fuel ratio is feedback controlled next from a learning map prepared by learning for the corresponding cylinder; and determining new learning correction coefficients .beta..sub.

Abstract: A method position measurement in which position about satellite orbits and information about time are received from satellites to determine a position of a point. The method includes a step to calculate a direction in which an error occurs based on positional information of a satellite and a step to determine the position of the point by use of road map information in the direction of the error.

Abstract: An apparatus for controlling an internal combustion engine comprises a position sensor for detecting an operational position of an accelerator pedal operated by a driver, a microprocessor for generating a target throttle valve opening in accordance with a predetermined function in response to the operational position of the accelerator pedal, and a servo motor provided with a throttle valve opening sensor and a servo drive circuit for controlling the opening of the throttle valve of the engine to the target throttle valve opening. In the microprocessor, there is provided a compensation circuit for compensating, during the acceleration, for the target throttle valve opening in response to the operational positions of the accelerator pedal immediately before and after the acceleration and an engine operational parameter immediately before the acceleration.

Abstract: A combustion control method wherein manipulated variables or the amounts of fuel and air in at least one combustion zone of a boiler are regulated so that both the amount of nitrogen oxides and the amount of unburned coal in the ash at an outlet of a burner furnace or at least one of them passes the regulation standards and satisfies the requirements for operating a plant.

Abstract: This invention relates to the supervision of a combustion state of a combustion furnace. A flame formed concentrically with the direction of a fuel jetted from a burner being the center is measured from its side, and two oxidizing flame zones as high luminance zones are extracted. Using the shape parameters of the flame, an index for reducing NOx and unburnt components in ash are calculated and estimated so as to supervise the combustion state. The positions or centroids of the flames and the distance between the centroids are used as the shape parameters, and the flame shape is divided into two zones for easy display of each zone.

Abstract: A method of diagnosing a combustion state in a furnace of a boiler wherein the shape of the root part of a flame (namely, the part closer to the fuel jet port of a burner) is picked up by an image sensor or the like, and the combustion state is diagnosed from the shape. Concretely, the relationships between the shapes of the root parts of flames and the combustion states of the furnace, e.g., the amount of CO or the amount of NOx are experimentally or empirically ensured and are stored in advance, one of the patterns of the stored flame shapes is selected on the basis of the shape of the root part of the flame actually observed, and the combustion state of the furnace is judged the combustion state of the selected flame shape.

Abstract: A method of controlling combustion in a furnace of a boiler or the like having a burner for a main combustion and a burner for a reducing combustion in order to effect combustion for furnace denitrification. The method comprises the steps of: estimating the NO.sub.x generation amount from data on a flame formed by the main combustion; estimating the reducing agent generation amount from data on a flame formed by the reducing combustion; and controlling the flow rates of fuel and air supplied for the main and reducing combustions so that the amount of NO.sub.x emission as the difference between the NO.sub.x generation amount and the reducing agent generation amount is below a specified value. In practice, each of the NO.sub.x generation amount and the reducing agent generation amount is estimated from the flame pattern, the flame volume, the distance between the outlet of the burner concerned and the root of the flame concerned, etc.

Abstract: A method of symptom diagnosis by continuously detecting vibration of the shaft of a rotary machine and monitoring a signal indicative of detected shaft vibration for the diagnosis of the operating condition of the rotary machine. In the method, a symptom of unusual operation of the rotary machine is diagnosed. The rotation speed range of the rotary machine is classified into a safety region, an alarm region and a trip region depending on the level of the shaft vibration signal. According to the disclosed method, symptom diagnostic regions are established within the safety region at time intervals of a symptom diagnostic period, and whether or not the level of the detected shaft vibration signal deviates from that of the symptom diagnostic regions is continuously monitored for the diagnosis of a symptom of unusual operation of the rotary machine.

Abstract: From the viewpoint of the preventive maintenance operation of a rotary machine, it is a very important subject to monitor the shaft vibration of the rotary machine and grasp the operating state of the machine. This invention relates to input processings in the case of executing the frequency analysis of a shaft vibration signal by digital processings.This invention describes the rotational frequency synchronization of a sampling frequency, the phase synchronization of the rotary machine to a reference phase, the relationship between an analytical wave number and a sample nunber, etc. in that case.