Electrical apparatus for initiating combustion in free piston engines专利检索-运动探测器传感器与探测器专利检索查询-专利查询网

Electrical apparatus for initiating combustion in free piston engines

阅读：909发布：2023-07-25

专利汇可以提供Electrical apparatus for initiating combustion in free piston engines专利检索，专利查询，专利分析的服务。并且Electrical apparatus is disclosed for initiating and controlling combustion in free piston engines having a power piston freely reciprocating within a power cylinder of the engine and alternately expanding and compressing gases in a combustion chamber within the power cylinder. A velocity probe in the form of a magnet arranged to move with the power piston and a sensing coil fixed to the housing of the free piston engine provides an electrical signal indicating the instantaneous value of the velocity of the power piston of the free piston engine. This electrical signal from the velocity probe is applied to a Schmitt trigger through a suitable electrical connection such as a voltage divider network or preferably a resistor-capacitor and diode network, and the Schmitt trigger provides an electrical timing signal to conventional means for initiating successive combustion power strokes within the engine. Using the electrical apparatus of the present invention, combustion is initiated for each power stroke at a point in time related to the velocity of the power piston, and thus to the time at which the power piston reverses direction, without the necessity of regard to the physical position, i.e., linear location, of the power piston along its path of movement within the power cylinder. Specifically, the Schmitt trigger is set in one condition when the piston velocity increases to a predetermined level as the piston accelerates during the first part of its movement toward a firing position. Then, as the piston slows down while approaching its reversal for the start of the power stroke, the decrease in piston velocity to a predetermined level sets the Schmitt trigger in another condition to cause a spark igniting another combustion initiating action. Additional electrical circuitry is included which may be used to aid in starting free piston engines.，下面是Electrical apparatus for initiating combustion in free piston engines专利的具体信息内容。

权利要求

1. In a free piston engine having a power cylinder, a movable piston assembly including a power piston which is freely reciprocable in said cylinder along a path of movement between desired normal inner and outer piston reversal points and in which a power stroke in one direction toward the outer reversal point immediately follows a compression stroke in the opposite direction toward the inner reversal point, and combustion-causing means for initiating combustion in the cylinder to move the power piston in one direction for each successive power stroke, the improvement comprising electrical sensing means including two relatively movable electrical members operable upon relative movement thereof to produce an electrical sensing signal dependent in magnitude upon the speed of such relative movement, one of which electrical members is operatively connected to the piston, and which members are electrically coupled to each other in a relatively constant manner over a substantial portion, including the final portion, of the movement of the piston during a compression stroke so that an electrical sensing signal is produced by said sensing means determined by the instantaneous value of a movement-related power piston characteristic which has a predeterminable relationship to the moment when the power piston reaches a reversal point at the end of each compression stroke, and which is substantially independent of variations in the actual physical position of the piston along its path at the moment of piston reversal for different power strokes, and electric control circuit means having input means and output means, the input means being connected to receive the electrical sensing signal from the sensing means, and the output means being connected to operate the combustion-causing means by providing a predetermined output signal at said output means, the electric control circuit means also having electric control signal generating means responsive to a predetermined electric sensing signal at the input means for providing said predetermined output signal at the output means at a point in time having a desired time relationship to the moment of power piston reversal at the end of each compression stroke.

2. The free piston engine apparatus of claim 1 having electrical network means connecting the sensing means to the input means of the electric Control circuit means, the sensing means having a coil in which the electrical sensing signal is generated, said network means including an R-C section having a resistor and a capacitor connected in parallel with each other and in series with the sensing means coil and also including a diode, the input means of the electric control circuit means having two input terminals, and said network means having means connecting the R-C section, sensing means coil and diode in series with each other across said input terminals.

3. An improved free piston engine apparatus according to claim 1 in which the sensing means includes first and second relatively movable parts, one of which is connected to move with the piston assembly, the electric control signal generating means comprising voltage level responsive trigger means for providing a first output control signal when the voltage level of the electrical sensing signal applied to the input means is below a threshold amplitude and providing a second output control signal when the voltage level of the electrical sensing signal applied to the input means is above the threshold amplitude, said electric control signal generating means providing said predetermined output signal at the output means in response to one of said output control signals from the trigger means, said means for causing combustion including control input means for initiating operation of the combustion causing means when said predetermined output signal is applied to the control input means, and the output means of the electric control circuit means being connected to the control input means of the combustion causing means.

4. The free piston engine apparatus of claim 3, wherein the voltage level responsive trigger means comprises a Schmitt trigger having output means, the signal from the sensing means causing a pulse output from the Schmitt trigger output means.

5. The free piston engine apparatus of claim 4, having voltage dividing means connecting the sensing means to the input means of the electric control circuit means, the voltage dividing means comprising: first resistive means; second resistive means; means for connecting the sensing means, the first resistive means and the second resistive means in electrical series; voltage divider output means connected across the second resistive means; and means for connecting the voltage divider output means to the input means of the electric control circuit means and thereby to the Schmitt trigger.

6. The free piston engine apparatus of claim 5 further including an inverting pulse amplifier having an input means and an output means; means for connecting the input means of the inverting amplifier to the output means of the Schmitt trigger; capacitive means for connecting the output means of the inverting amplifier to the electric control circuit output means and thereby to the control input of the combustion initiating means; and diode means having one end connected to the control input of the combustion initiating means and having the other end connected to provide a unidirectional electrical current path to a common point in the electrical circuitry.

7. The free piston engine apparatus of claim 5 also including means for aiding in the starting of the free piston engine, comprising in combination: controlled switch means; further resistive means; and connection means for connecting the further resistive means and controlled switch means in electrical series and for connecting the series connection of the further resistive means and the controlled switch means in electrical parallel with the second resistive means for lowering the voltage division ratio of the voltage dividing means when the switch means is closed; the controlled switch means being arranged to be closed upon the normal operation of the free piston engine.

8. The free piston engine apparatus of claim 3 having voltage dividing means connecting the sensing means to the input means of the electric control circuit means, thE voltage dividing means comprising: first resistive means; second resistive means; means for connecting the sensing means, the first resistive means and the second resistive means in electrical series; voltage divider output means connected across the second resistive means; and means for connecting the voltage divider output means to the input means of the electric control circuit means and thereby to the trigger means.

9. The free piston engine apparatus of claim 8, also including means for aiding in the starting of the free piston engine, comprising in combination: controlled switch means; further resistive means; and connection means for connecting the further resistive means and controlled switch means in electrical series and for connecting the series connection of the further resistive means and the controlled switch means in electrical parallel with the second resistive means for lowering the voltage division ratio of the voltage dividing means when the switch means is closed; the controlled switch means being arranged to be closed upon the normal operation of the free piston engine.

10. The free piston engine apparatus of claim 1 including switch means operated upon said piston reaching a predetermined position during the initial starting operation of the engine, means responsive to the operation of said switch means for causing operation of said combustion-causing means independently of the value of the signal from said electrical sensing means, and means effective to prevent said switch means from affecting the operation of said combustion-causing means during operation of said engine after combustion has been initiated.

11. The free piston engine apparatus of claim 1 having electrical network means connecting the electrical sensing means to the input means of the electric control circuit means, the electrical sensing means having as one of said two relatively movable electrical members a coil in which the electrical sensing signal is generated, said network means including means for connecting said coil to said input means of said electric circuit control means and also including capacitive means effective as said engine speed increases to decrease the effect on said circuit control means of a sensing signal of a predetermined magnitude from said coil.

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Electrical apparatus for initiating combustion in free piston engines

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