| Patent Number |
Title Of Patent |
Date Issued |
| D387333 |
Heatsink enclosure for an electrical controller |
December 9, 1997 |
|
| D288791 |
Battery state-of-charge meter |
March 17, 1987 |
|
| 6622069 |
Automatic motor adjustment for differentially steered dual electric motor system |
September 16, 2003 |
| Methods and apparatus for adjusting at least one of the motors in an electrically driven vehicle having a first motor for controlling a first wheel and a second motor for controlling a second wheel are disclosed. The method is performed in response to input from a user control that enabl |
| 6611116 |
Anti-spin control for a separately excited motor drive system |
August 26, 2003 |
| Methods and apparatus for controlling performance of electric motors in a system having two or more electric motors, the motors adapted for being coupled to two or more wheels of an electric vehicle, each of the electric motors having armature and field coils which are independently exci |
| 6456043 |
Method of diagnosing the state of health of a battery |
September 24, 2002 |
| In one preferred embodiment of the invention, a method of restoring charge to a battery operating with a predetermined terminal voltage, including: determining an expected rate of degradation of a plate or plates of a battery in terms of decrease of capacity per unit time and temperature |
| 6439067 |
Shaft sensor assembly for angular velocity, torque, and power |
August 27, 2002 |
| In a preferred embodiment, a shaft sensor for a machine, the shaft sensor including: first and second disks, fixedly orthogonally attached to a portion of a shaft of the machine, the portion of the shaft being subject to torsion, and the first and second disks being operatively attached |
| 6380716 |
Condition monitoring of opportunity charged batteries |
April 30, 2002 |
| In a preferred embodiment, a method of condition monitoring of an opportunity charged battery, including: determining length of time the battery has been off-line; determining whether charging of the battery has occurred during the length of time; if step (b) results in a determination |
| 6362601 |
Method of battery charge restoration based on estimated battery plate deterioration and/or based |
March 26, 2002 |
| In one preferred embodiment of the invention, a method of restoring charge to a battery operating with a predetermined terminal voltage, including: determining an expected rate of degradation of a plate or plates of a battery in terms of decrease of capacity per unit time and temperature |
| 6208245 |
Engine oil change indicator system |
March 27, 2001 |
| In a preferred embodiment, an engine oil change indicator system, including: a combination engine oil pressure sensor and engine oil temperature sensor connected to a port on the engine to which port is normally connected an oil pressure switch; and a microprocessor connected to rece |
| 6202039 |
Compact, low-cost semiconductor device for receiving arbitrary input parameters and driving sele |
March 13, 2001 |
| In a preferred embodiment, a system of physical measurement and display of a parameter, including: accepting an input signal representative of a value of the parameter, the input signal having an arbitrary shape and amplitude; and displaying the value of the parameter in an arbitrary |
| 6181106 |
Sequential high-rate charging of battery cells |
January 30, 2001 |
| In a preferred embodiment, a sequential high-rate battery charger for charging a battery having a plurality of cell units, the battery charger including a current source; an apparatus to selectively sequentially connect each of the plurality of cell units to the high current source; |
| 5451881 |
Method and means for adjusting battery monitor based on rate of current drawn from the battery |
September 19, 1995 |
| In a preferred embodiment, a metering system for measuring and indicating the state of charge of an electrical storage battery, including: apparatus for storing a numerical value indicative of the state of charge of the battery and for providing an output voltage signal representative th |
| 5374881 |
Electric motor controller |
December 20, 1994 |
| A motor controller comprises a plug detect circuit which detects "continuous" plug diode conduction during plug braking. The plug detect circuit detects "continuous" plug braking by detecting when a plug diode is or is not conducting current throughout substantially the entire time t |
| 5261025 |
Method and apparatus for DC motor speed control |
November 9, 1993 |
| In a preferred embodiment, a high-frequency, pulse-width-modulated, power-transistor, DC motor speed controller having current limiting in both drive and regenerative modes, essentially constant ramping rates regardless of whether or not the operator switches to neutral before changi |
| 5247253 |
Eddy current proximity sensing means and method useful for determining throttle position |
September 21, 1993 |
| In a preferred embodiment, an inductor excited by a square-wave alternating current to produce a magnetic field in the inductor. A member movable in proximity to the inductor causes losses in the magnetic energy, which losses are directly related to the position of the member with respec |
| 5202682 |
Data encodement and reading method and apparatus |
April 13, 1993 |
| A method and apparatus for measuring operations data which uses a commercially available digital multimeter (DMM) as the data receiving and display device. In one preferred embodiment, for example, basic operations data is transduced to digital form and then coded with a width modulator. |
| 4852104 |
Solid-state reader device for a cumulative operations measurement system |
July 25, 1989 |
| A reader device, preferably implemented in solid-state form, is provided as a separate element for connecting to a so-called cumulative operations measurement system. Such a system is, for example, concerned with the measurement of elapsed time, especially in determining how long a p |
| 4740754 |
Bidirectional battery state-of-charge monitor |
April 26, 1988 |
| The monitor is a circuit including an integrator for storing a state-of-charge measurement and a charge signal channel and a separate discharge signal channel both arranged for connection to receive a battery terminal voltage signal. The charge signal channel is operable in response |
| 4728923 |
Steerable wheel direction indicator |
March 1, 1988 |
| The indicator is especially useful for an industrial truck with a steerable wheel which can be turned through a steering arc of as much as one hundred eighty degrees. The indicator includes a potentiometer mechanically coupled to be rotated in synchronism with the steering rotation of th |
| 4724332 |
Synchronous load lock-out control system for battery powered equipment |
February 9, 1988 |
| The system includes a battery state-of-charge monitoring circuit which is operable to produce a signal change when there is a change in the battery charge from an acceptable charge to a substantially reduced charge. The signal change from the monitor is connected to control a lock-out re |
| 4712195 |
Solid-state cumulative operations measurement system |
December 8, 1987 |
| The system accurately measures a summation of the operations when an operating voltage is present. The system includes a capacitor charged by a supply voltage and a volatile memory register connected to receive the operating voltage signals to be measured and operable to store those |
| 4626750 |
Solid state d.c. motor control |
December 2, 1986 |
| The system includes a plurality of parallel-connected power field effect transistors arranged for connection in series with the traction motor with a common control circuit connected to the gate electrodes of the field effect transistors to control the on-off cycle of conduction through |
| 4560937 |
Battery state of charge metering method and apparatus |
December 24, 1985 |
| The system includes a digital integrator having a plurality of digital stages operable to store a numerical value in binary digital form which is indicative of state of charge. A switching circuit is provided for generating a series of voltage pulses on a single output line with each |
| 4460870 |
Quiescent voltage sampling battery state of charge meter |
July 17, 1984 |
| State of charge is determined for a battery during a quiescent interval with substantially no current flow through the battery by determining the quiescent time interval since the last substantial current flow through the battery, taking a rapid measurement of the battery terminal voltag |
| 4388618 |
Battery state of charge indicator operating on bidirectional integrations of terminal voltage |
June 14, 1983 |
| Battery terminal voltage is measured on a continuing basis during both positive and negative voltage excursions with relation to a summed reference value to obtain a measured difference. The resultant measured difference causes the generation of convergence function signals which var |
| 4288734 |
Bidirectional integrator |
September 8, 1981 |
| A bidirectional integrator is described comprising first and second programmable pulse-forming channels (20, 40), a bidirectional counter (60) and an output display (78). Each pulse forming channel provides means for making both continuous and discrete adjustments in the repetition rate |
| 4193026 |
Method and apparatus for measuring the state of charge of a battery by monitoring reductions in |
March 11, 1980 |
| A method and apparatus are disclosed for measuring the state of charge of a battery. The apparatus comprises threshold means for sensing reductions below a threshold level in the output terminal voltage of the battery and for producing a signal in response thereto and means for integrati |
| 4192009 |
Coulometric device for performing time integration |
March 4, 1980 |
| A coulometric device for performing integration or timing functions with precise end-state detection comprises a coulometer; serially connected to the coulometer, a source of pulsed d.c. current representative of one or more quantities to be integrated; and a pulse height discriminator f |
| 4186339 |
Method and apparatus for measuring current, especially useful in multi-ampere systems |
January 29, 1980 |
| The disclosed method and apparatus make three connections to a pair of conductors: two at spaced-apart points on one conductor and the third on the other conductor. Using the power available in the conductors, a differential amplifier produces an output signal representative of current |
| 4139896 |
Method and apparatus for producing nonlinear integral functions |
February 13, 1979 |
| An integrator system is disclosed which incorporates a feedback control loop to vary the linearity of the integrator's response. In the preferred embodiment an electrochemical coulometer is used which stores the integral of a current that is passed through it. Control is achieved by feed |
| 4017724 |
Apparatus for measuring battery depletion by monitoring reductions in voltage |
April 12, 1977 |
| The apparatus comprises means for sensing reductions in the output terminal voltage of the battery due to varying load conditions and producing a signal in response thereto during the time that the terminal voltage is below a threshold value. The apparatus further comprises integrator me |
| 4012681 |
Battery control system for battery operated vehicles |
March 15, 1977 |
| A system is disclosed for monitoring the state of charge of batteries in a fleet of electrically powered vehicles. Each battery has associated with it an integrator module which registers both the depletion and charging of the battery. While the battery is in use in the vehicle, a portio |
| 4006415 |
Fast reset integrator |
February 1, 1977 |
| An integration system is disclosed including a reversible integrating device having an integrating capacity between its upper and lower limits of integration which is at least twice that which is required for a desired application. Circuitry is provided for reading the integral stored |
| 4001688 |
Coulometer with end of integration color change indicator |
January 4, 1977 |
| A coulometer signaling device is disclosed which indicates when a particular machine has been used for a predetermined amount of time. The device comprises a mercury coulometer which includes an electrolyte whose color changes when the mercury deposited on the anode of the coulometer |
| 3992668 |
Electro-thermal readout of coulometers |
November 16, 1976 |
| Systems are disclosed for reading the integral stored in a coulometer by sensing the thermal properties of the electrolyte. A preferred embodiment comprises at least one temperature sensitive element and a heat source placed adjacent the coulometer positioned in such a manner with respec |
| 3992667 |
Electro-thermal readout coulometer |
November 16, 1976 |
| A method and apparatus are disclosed for reading a coulometer by sensing the temperature of the electrolyte. A preferred embodiment comprises a pair of temperature sensitive elements spaced apart along the coulometer and connected to a bridge circuit. |
