Abstract: A start-up assisting degree by a motor is set at an appropriate level on the basis of a catalyst condition represented by a catalyst temperature, an oxygen storage (degree) in the catalyst, a change in combustion control represented by an air-fuel ratio for combustion, an ignition timing, or an engine condition such as an engine stopping time period, an engine cooling water temperature, a crank stopping position or rotational load.

Abstract: A start-up assisting degree by a motor is set at an appropriate level on the basis of a catalyst condition represented by a catalyst temperature, an oxygen storage (degree) in the catalyst, a change in combustion control represented by an air-fuel ratio for combustion, an ignition timing, or an engine condition such as an engine stopping time period, an engine cooling water temperature, a crank stopping position or rotational load.

Abstract: A method and system for starting an internal combustion engine by utilizing combustion energy produced by injecting and igniting fuel in an engine cylinder under the expansion stroke, which can eliminate the necessity of precisely computing the combustion energy, can minimize an amount of energy, other than the combustion energy, supplied from a second energy supply unit, and can realize stable engine startup without causing a startup failure due to a combustion failure. At startup of the engine, energy is supplied to the engine from both a first energy supply unit performing direct injection and ignition of fuel, etc. and a second energy supply unit employing, e.g., a starter motor, thereby starting the engine. After the engine has started motion, the motion status of the engine is determined based on, e.g., the engine revolution speed, and the energy supply to the engine from the second energy supply unit is stopped based on a determination result.

Abstract: Control equipment for an electric car and a control method thereof can be realized with control equipment for an electric car mounted with a plurality of rotating machines equipped with a plurality of microcomputers for individually controlling each rotating machine with a simple configuration in such a manner as to enable diagnosis of abnormalities of the control equipment to a high degree of precision. The plurality of microcomputers for individually controlling each rotating machine at the control equipment of the electric car comprise a control data calculator for generating control data for controlling respective target rotating machines and a fault diagnosis module for transmitting and receiving the control data to and from another microcomputer as control data for diagnosis use via a communication device, comparing the control data and the control data for diagnosis use, and diagnosing the presence or absence of a fault. An electric car comprising a plurality of microcomputers, e.g.

Abstract: A more compact and light-weight drive unit is required for an electric vehicle in order to improve its mileage per charge, acceleration performance and overall efficiency. A control apparatus which generates drive signals to drive power devices in the power converter includes: a current reference generator calculates from a torque reference value a d-axis exciting current reference value on the basis of which the ac motor generates a magnetic flux, and a q-axis torque current reference value, the d-axis and the q-axis being orthogonal to each other; a current control circuit generates ac voltage reference values Vu*, Vv* and Vw* from the d-axis exciting current reference value and the q-axis torque current reference value; and a drive signal generator generates drive signals to drive power devices from the ac voltage reference values. Both the current reference generator and the current control circuit are processed digitally by the same arithmetic unit.

Abstract: An apparatus for steadily and efficiently controlling a synchronous motor is equipped with a function for generating dq-axis current commands so that the terminal voltage of the synchronous motor may not exceed the voltage which a power converter can output even at a current transition time, a current control function for correcting a fluctuation of a D.C. input voltage, and a function for eliminating the D.C. input power to zero when performing field weakening control. The dq-axis current command generator is so built as to retrieve current command tables listing high-efficiency data in advance by torque commands and rotational speeds of the synchronous motor. There are a plurality of current command tables converting maximum terminal voltages of the synchronous motor. A means is provided to select an optimum one of said current command tables according to the D.C. input voltage. In this case, a value obtained by subtracting a preset value from the D.C.

Abstract: A control device for controlling a motor of an electrical vehicle is provided with a motor control circuit 7 having a first calculation control circuit 11 and a second calculation control circuit 12. In operation, the motor control circuit 7 allows the first and second calculation control circuits 11, 12 to respectively calculate motor control commands It*, Im* and Its*, Ims* on the basis of inputted identical driving condition. The circuit 7 compares the motor control commands It*, Im* calculated by the first calculation control circuit 11 with the motor control commands Its*, Ims* by the second calculation control circuit 12, respectively. When a difference between the calculated commands It* and Its* and another difference between the calculated commands Im* and Ims* are equal to or more than a predetermined value, then the motor control circuit 7 outputs a stop command to stop an operation of the motor.

Abstract: An inverter main circuit has a DC link capacitor for driving a motor with a power of a battery. An inverter relay is arranged to feed a power of the battery to the inverter main circuit. An auxiliary relay is arranged to feed a power of the battery to the inverter main circuit through a resistor. A main key switch connects the battery to the inverter main circuit through the inverter and auxiliary relays when assuming ON, causing the motor to serve as a generator to charge the DC link capacitor when assuming OFF. When, upon turning the main key switch ON, a speed sensor senses that the rotation speed of the motor is within a predetermined range, a control unit turns the auxiliary relay ON, then the inverter relay ON after shorting armature coils of the motor with the aid of the inverter main circuit and then stops the shorting of the armature coils with the aid of the inverter main circuit.

Abstract: In an electric vehicle having a synchronous motor as the driving source, a control system and a control method for the electric vehicle can prevent over current in the main circuit or over charging of the battery at the re-closing of an opened inverter relay and is always capable of operating the power-train system in a better condition. A control method for an electric vehicle having an inverter for supplying a direct current electric power from a battery to the synchronous motor, a smoothing capacitor, connected to the inverter in parallel for smoothing the direct current electric power, an inverter control circuit and an inverter relay for connecting and disconnecting the inverter and the smoothing capacitor to and from the battery. The inverter is controlled so as to prevent current from flowing into or flowing out of the inverter until the re-closing operation of the inverter relay is completed when the opened inverter relay is re-closed.

Abstract: A braking apparatus for an electric vehicle in which a mechanical anti-lock brake and regenerative braking cooperate with each other to improve a braking performance is realized. On condition that an accelerator is released off, the wheel rotation number is large, and a brake is trod on, a large regeneration mode is selected by a motor controller when a wheel slip is small, and a regeneration mode is selected when the wheel slip is large. When the wheel slip is small, the braking force exerted on each wheel is increased by the brake controller and the regenerative braking force is also increased so that a slip ratio comes quickly closer to 0.2. When the wheel slip is large, the brake controller reduces the braking force so that the slip ratio comes closer to 0.2. In this case, the regenerative braking force is smaller than the above case of the small wheel slip to such an extent that the operation of the brake controller is not disturbed.

Abstract: Disclosed is a car air conditioner in which a variable-capacity compressor can be stopped on the basis of judgment as to the failure of a variable capacity mechanism of the compressor to prevent the injury of the compressor when a signal, such as a failure signal, an engine revolution speed signal, or the like, reaches a predetermined value because of the failure. Further disclosed is a car air conditioner in which an uncomfortable feeling caused by the change of the air temperature can be eliminated.

Abstract: An air-conditioning apparatus for automobiles comprises a device for detecting the internal air temperature providing the temperature in the automobile cabin, a device for detecting the atmospheric air temperature, a device for setting a target value of the internal air temperature, a device for calculating a target value of the air blowdown temperature from the output signals of the aforementioned three devices, a device for calculating a compensation amount for the compressor capacity from the difference between the target value and the output signal of a device for detecting the actual air blowdown temperature, and a device for controlling the compressor capacity in accordance with the result of the calculation.

Abstract: An air conditioner system for an automotive vehicle includes air cooling means, air heating means arranged downstream of the air cooling means, a bypass air passage bypassing the air heating means, means for detecting the temperature of intake air immediately before passing through the air cooling means, and means for comparing the intake air temperature detected by the intake air temperature detecting means and a desired temperature. The amount of air flow through the bypass air passage is controlled when the intake air temperature is lower than the desired temperature by a first predetermined deviation value, and the amount of air flow through the bypass air passage is controlled at the maximum value when the intake air temperature is greater than the desired temperature value by a second predetermined deviation value. The compressor is actuated when the intake air temperature is larger than the desired air temperature.

Abstract: An automatic air-conditioning apparatus, especially suitable for air-conditioning of an automotive vehicle, comprises a microcomputer controlling the air-conditioning operation and a temperature display element selectively displaying an internal air temperature of the vehicle compartment sensed by an air temperature sensor and a temperature setting set by a temperature setting unit. The temperature display element displays normally the internal air temperature but displays the temperature setting for a predetermined period of time only when the temperature setting unit is manipulated. In the main control flow including the steps of air-conditioning control and temperature display stored in the microcomputer, an interrupt routine is periodically run for the purpose of analog data processing requiring a relatively long period of time, so that the microcomputer can efficiently carry out other controls.