Abstract: A method is provided for measuring remaining hydrogen capacity of hydrogen storage canister incorporating tag information. An information identification tag is attached to a hydrogen storage canister. The information identification tag contains therein at least one record of tag information indicating the hydrogen storage quantity of the hydrogen storage canister. Once the hydrogen storage quantity is read from the tag information of the information identification tag and hydrogen consumption quantity supplied from the hydrogen storage canister is detected, the hydrogen storage quantity is operated by subtracting the hydrogen consumption quantity therefrom to calculate a hydrogen residue, which is then used to update the tag information of the information identification tag or is stored for subsequent use.

Abstract: A method and system of gas refilling management for gas storage canister utilizing identification accessing control includes an identification information transmission device, a control device, and a gas refilling equipment, which are applicable for management of refilling of at least one storage canister. The storage canister is provided with an information identification label, which contains at least one record of canister information. By using the identification information transmission device to first read the information contained in the label of a storage canister, the control device may then set a refilling condition based on which the gas refilling equipment carries out a refilling operation to the storage canister, so as to suit for management of refilling various types of gas storage canisters to provide the best performance in a practical application.

Abstract: A method is provided for measuring remaining hydrogen capacity of hydrogen storage canister incorporating tag information. An information identification tag is attached to a hydrogen storage canister. The information identification tag contains therein at least one record of tag information indicating the hydrogen storage quantity of the hydrogen storage canister. Once the hydrogen storage quantity is read from the tag information of the information identification tag and hydrogen consumption quantity supplied from the hydrogen storage canister is detected, the hydrogen storage quantity is operated by subtracting the hydrogen consumption quantity therefrom to calculate a hydrogen residue, which is then used to update the tag information of the information identification tag or is stored for subsequent use.

Abstract: A method and system of gas refilling management for gas storage canister utilizing identification accessing control includes an identification information transmission device, a control device, and a gas refilling equipment, which are applicable for management of refilling of at least one storage canister. The storage canister is provided with an information identification label, which contains at least one record of canister information. By using the identification information transmission device to first read the information contained in the label of a storage canister, the control device may then set a refilling condition based on which the gas refilling equipment carries out a refilling operation to the storage canister, so as to suit for management of refilling various types of gas storage canisters to provide the best performance in a practical application.

Abstract: Provided is a brushless DC motor speed controller in which the speed feedback signal needed for speed control is obtained from the commutation signals generated by the magnetic-pole sensor in the brushless DC motor. The-brushless DC motor speed controller includes an edge detector, which generates a pulse each time a rising or falling edge is detected in the signal from the magnetic-pole sensor of the brushless DC motor. A frequency multiplier is used to multiply the frequency of the pulse train from said edge detector. A frequency-to-voltage converter is used to convert the output pulse train from said frequency multiplier into a positive analog voltage, with the level of the positive analog voltage being in proportion to the speed of the brushless DC motor. A motor rotating direction detecting circuit receives the output signal from said magnetic-pole sensor and thereby detects in which direction the brushless DC motor currently rotates.

Abstract: A method and device for controlling the torque of a brushless DC motor used in an electric motorcycle, in which a single current loop is employed to obtain a feedback current by a current detector from a DC bus which simplifies the construction of the circuit scheme. The device of this invention operates by two input signals; one of them is a torque command signal to generate a positive torque of the motor, and the other is brake command signal to generate a negative torque of the motor so as to operate a control brake command and to store the energy generated during a braking operation into a battery of the motorcycle, as well as to stop the rotation of the brushless DC motor within 120.degree. of its electrical angle of reversed rotation.

Abstract: The speed of a brushless DC motor driving an electric vehicle is controlled with a speed feedback signal proportional to rotation speed of the motor by processing the back electromotive force (EMF) waves of the brushless DC motor. In this method, the back EMF waves of plural phases are taken to pass the differential amplifiers for each phase, and the back EMF signals in the rising and falling regions of the back EMF waves of each phase are obtained to synthesize, by the commutation signals of a magnetic pole sensor passing the phase detecting circuit, after full-wave rectification and low-pass filtering, a [speed feedback signal. This method differs from normal speed control of a motor, in which a speed feed-back element such as a DC tachometer or an encoder is necessary for controlling the speed. This invention permits the brushless DC motor to control the speed without a feedback element such as a DC tachometer or an encoder, thereby decreasing the cost of the brushless DC motor speed control system.

Abstract: A current limiting device to limit the maximum allowable electric current to be supplied to a motor in driving an electric vehicle. The current limiting device includes (a) a first thermal switch to prevent the power switching element of the motor from being abnormally overheated, (b) a second thermal switch to prevent the motor from being abnormally overheated, and (c) a brake switch. The three switches altogether and in association with a certain hysteresis band work to switch the limits of the electric current passing through the motor between two or more predetermined electric current values. Under normal operating conditions, the limit of the current is set at a high level which is associated with a hysteresis action, and when one of the thermal switches or the brake switch is actuated, the limit of the electric current is switched to a lower value which is still associated with a hysteresis action.