CA1121034A - Ignition override system for motor vehicles - Google Patents
Ignition override system for motor vehiclesInfo
- Publication number
- CA1121034A CA1121034A CA000310659A CA310659A CA1121034A CA 1121034 A CA1121034 A CA 1121034A CA 000310659 A CA000310659 A CA 000310659A CA 310659 A CA310659 A CA 310659A CA 1121034 A CA1121034 A CA 1121034A
- Authority
- CA
- Canada
- Prior art keywords
- switch
- ignition
- coil
- park
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000007935 neutral effect Effects 0.000 claims description 3
- 230000000332 continued effect Effects 0.000 claims 1
- 239000004020 conductor Substances 0.000 description 15
- 239000007858 starting material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P15/00—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits
- F02P15/12—Electric spark ignition having characteristics not provided for in, or of interest apart from, groups F02P1/00 - F02P13/00 and combined with layout of ignition circuits having means for strengthening spark during starting
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An ignition override circuit for use in a motor vehicle includes a switch connecting the battery and the ignition coil;
a coil for closing the switch, the coil connecting the switch to the vehicle park switch; and a timer between the switch and coil;
whereby, with the vehicle engine running and the park switch closed, setting of the timer energizes the coil to close the switch and permit continued operation of the vehicle engine for the time set on the timer even with the car turned "off" and the key removed.
An ignition override circuit for use in a motor vehicle includes a switch connecting the battery and the ignition coil;
a coil for closing the switch, the coil connecting the switch to the vehicle park switch; and a timer between the switch and coil;
whereby, with the vehicle engine running and the park switch closed, setting of the timer energizes the coil to close the switch and permit continued operation of the vehicle engine for the time set on the timer even with the car turned "off" and the key removed.
Description
This invention relates to an ignition override circuit, and in particular to an ignition ovexride circuit for use in a motor vehicle with a gasoline or diesel ~uel operated engine.
In northern climes, there exists a need for an ignition `
override circuit of the type which permits continuous operation ~ -of a motor vehicle engine for a preaetermined set time, while the vehicle is unoccupied and locked, thus preventing theft of the vehicle. The logical way to prevent theft is to provide a circuit which keeps the engine running even when the key is removed from the ignition. Applicant proposes such a circuit, in which the engine will run for a predetermined set time with the vehicle in park and the key removed from the ignition.
There are presently available many vehicle ignition override circuits for theft prevention and automatic starting of the vehicle. Examples of such circuits are found in U.S.
Patents Nos. 2,695,676, which issued to G.A. Wettengel on November 30, 1954; 3,614,458, which issued to I.~. Stein on October 19, 1971; 3,646,515, which issued to F. Vodehnal on February 29, 1972; 3,657,697, which issued to W.C. Schultz on April 18, 1972; 3,685,606, which issued to R.H. Blow, Jr. on August 22, 1972 and 3,749,930, which issued to B. Roe on July 31, 1973.
~ . .
Most of the art listed above is of general interest because it is in the same field as applicant's invention.
However, for the most part, the patents disclose relatively complicated antitheft devices for motor vehicles which include timers intended, for example, to cut off the fuel supply to an engine or to start a motor vehicle at a predetermined set time.
A review of the prior art makes it readily apparent that the ignition override circuits disclosed thereby either could not be used to achieve the object of the present invention, or if - 1 - ~ ;
.,h,~
,:
133~
they could be so utilized th.ey- are relatively complicated.
With the object mentionea hereinbefore in mind, applicant provides an ignition override circuit for use with a conventional vehicle ignition circuit of the type including a battery, an ignition switch movable between the park, starting and running positions for connecting the battery to an ignition coil, starting means and a park switch controlling operation of said starting means to permit starting of the vehicle engine in the park and neutral positionsonly of the gear lever, the override circuit comprising switch means connected to said battery and to said ignition coil; coil means for closing said : -switch means, said coil means being connected to said switch means and to said park switch; and timer means between said switch means and said coil means, whereby with the vehicle engine operating closing of the park switch and setting of the timer means closes said switch means to complete a circuit between the battery and the ignition coil by-passing the ignition switch to permit continued operation of the vehicle engine with the ignition switch open for a predetermined set time.
The invention will now be described in greater detail with reference to the accompanying drawings, which illustrate ;
a preferred embodiment o~ the invention, and wherein:
Figure 1 is a block diagram of an override circuit in accordance with the present invention; .
Figure 2 is a more detailed block diagram of the circuit of Fig. 1, and Figures 3 to 5 are schematic views of an ignition switch in the off, start and running positions, in that orderO
Referring to Figures 1 and 2, a conventional automobile ignition system includes a battery 1 connected to ground 2 and 93~
through a lead 3 and an ignition switch 4 to (a) a starter relay coil 5 and park switch 6 via lead 7, (b) an ignition coil 8 via lead 9, and (c~ an accessory fuse ~lock 10 via lead 11. In the off position, the ignition switch is open, i.e.
the lead 3 from the battery 1 is not connected to any of the leads 7, 9 and 11 (Fig. 3). In order to start the vehicle, the gear shift (not shown) is placed in park or neutral to close the park switch 6, which is also connected to ground at 12.
By turning the ignition key, the ignition switch 4 is rotated to the start position (Fig. 4), in which hot lead 3 from the battery is electrically connected via leads 7 and 9 -to the starter relay coil 5 and the ignition coil 8, respectively.
Current flows from the battery 1, to the starter relay coil 5 to actuate the starting motor (not shown) and via the ignition coil 8 to the spark plugs (not shown). The ignition coil 8 is also connected to ground at 13. The qround in each case is the vehicle frame (not shown). In the start position of the ignition switch 4; no contact is made with the lead 11, and consequently, no current flows to the accessory fuse block lO
or the car accessories (heater, radio, etc.).
As soon as the engine has started, the ignition key is released and the ignition switch automatically moves to the running position (Fig. 5). In the running position, current from the battery 1 is constantly fed to the ignition coil 8 and the accessory fuse block 10 to sustain operation of the vehicle engine and per~it use of the accessories. Since current is no longer required for the starting motor,movement of the gear shift out of park with resultant opening of the switch 6 will not affect operation of the vehicle, i.e. the engine will continue to run.
Referring again to Figs. 1 and 2, the override circuit 3~
of the present invention includes a double pole, single throw relay 14 connected directly to the lead 3 from the battery 1 by lead 15. In practice, the lead 15 could be connected to the hot side of the ignition switch (Fig. 2~. In any event, the lead 15 by~passes the ignition switch 4 and directly connects the battery 1 to the relay 14. The relay 14 includes a double pole, single throw switch 16 and a separate coil 17 for closing the switch 16. Contacts 18 on the hot side of the switch 16 are interconnected by a conductor 19, so that current flow through the switch occurs through both outlet conductors 20 and 21 simultaneously or through neither of the conductors 20 or 21.
The conductor 20 is connected to the accossory fuse block 10, and the conductor 21 is connected to the ignition coil 8 and to a timer 22 by a conductor 23. The timer 22 is electrically connected to one terminal 24 of the switch 16 by .
a conductor 25. The other terminal 26 of the coil 17 is :.:
electrically connected to the park switch 6 by conductor 27.
In operation of the override circuit, with the vehicle in park and the engine running, the timer 22 is set, i.e. closed for a predetermined set time. Closing o-f the timer switch causes current to flow through the conductors 9, 23 and 25 to the coil 17, closing the switch 16. With the switch 16 closed, .
current can flow directly through the conductors 3 and 15, the switch 16 and the timer 22 to the coil 17. Because the vehicle is in park, current flows through the conductor 27 and the park switch 6 to ground at point 12 completing an elec-trically conductive circuit which by-passes or overrides the ignition switch 4. In other words the ignition switch can be turned to the off position (Fig. 3) and the key removed, but the engine will continue to run. The ignition coil 8 will receive current from the battery 1 via conductors 3 and 15, switch 16, and 3~
conductors 21 and 23. The accessory fuse block 10 will receiYe current from the battery 1 via the conductors 3 and lS, switch 16 and conductor 20~
As soon as the timer 22 times out, i.e. opens, current ceases to flow to the coil 17 and thus the switch 16 opens to stop the vehicle engine and prevent use of the accessories.
Thus, there has been described an ignition override circuit which permits a driver to start a vehicle engine, and by setting a timer and turning the engine off he can remove -the key and lock the vehicle with the engine still running. The engine will continue to operate until the end of the time period set by the timer. It would be difficult to steal the vehicle because the doors would be locked even though the engine is running. Moreover, with the vehicle in park, the steering wheel would be locked, making it impossible to steal the unattended vehicle. If a person does gain entry to the vehicle, and moves the gear shift lever out of park, the coil of the double pole, single throw relay would become de-energized, which would cause the switch of such relay to open. Thus, the vehicle engine would stop as would current flow to the accessory block.
The only way to re-start the engine is with the ignition key in the normal manner.
It will be appreciated that a variety of circuit breakers can be employed instead of the timer. For example an electronically operated timer such as a linear integrated circuit timing chip, e.g. the so-called 555 Timer available from RCA.
Another alternative is a simple on-off toggle switch;
which when turned on would cause the relay coil to be energized, and when turned off would de-energize the coil and stop the vehicle engine.
3~
of course, with the different vehicle ignition systems presently in use, some minor modifications may be reguired when installing the override circuit of this invention.
' `
;
In northern climes, there exists a need for an ignition `
override circuit of the type which permits continuous operation ~ -of a motor vehicle engine for a preaetermined set time, while the vehicle is unoccupied and locked, thus preventing theft of the vehicle. The logical way to prevent theft is to provide a circuit which keeps the engine running even when the key is removed from the ignition. Applicant proposes such a circuit, in which the engine will run for a predetermined set time with the vehicle in park and the key removed from the ignition.
There are presently available many vehicle ignition override circuits for theft prevention and automatic starting of the vehicle. Examples of such circuits are found in U.S.
Patents Nos. 2,695,676, which issued to G.A. Wettengel on November 30, 1954; 3,614,458, which issued to I.~. Stein on October 19, 1971; 3,646,515, which issued to F. Vodehnal on February 29, 1972; 3,657,697, which issued to W.C. Schultz on April 18, 1972; 3,685,606, which issued to R.H. Blow, Jr. on August 22, 1972 and 3,749,930, which issued to B. Roe on July 31, 1973.
~ . .
Most of the art listed above is of general interest because it is in the same field as applicant's invention.
However, for the most part, the patents disclose relatively complicated antitheft devices for motor vehicles which include timers intended, for example, to cut off the fuel supply to an engine or to start a motor vehicle at a predetermined set time.
A review of the prior art makes it readily apparent that the ignition override circuits disclosed thereby either could not be used to achieve the object of the present invention, or if - 1 - ~ ;
.,h,~
,:
133~
they could be so utilized th.ey- are relatively complicated.
With the object mentionea hereinbefore in mind, applicant provides an ignition override circuit for use with a conventional vehicle ignition circuit of the type including a battery, an ignition switch movable between the park, starting and running positions for connecting the battery to an ignition coil, starting means and a park switch controlling operation of said starting means to permit starting of the vehicle engine in the park and neutral positionsonly of the gear lever, the override circuit comprising switch means connected to said battery and to said ignition coil; coil means for closing said : -switch means, said coil means being connected to said switch means and to said park switch; and timer means between said switch means and said coil means, whereby with the vehicle engine operating closing of the park switch and setting of the timer means closes said switch means to complete a circuit between the battery and the ignition coil by-passing the ignition switch to permit continued operation of the vehicle engine with the ignition switch open for a predetermined set time.
The invention will now be described in greater detail with reference to the accompanying drawings, which illustrate ;
a preferred embodiment o~ the invention, and wherein:
Figure 1 is a block diagram of an override circuit in accordance with the present invention; .
Figure 2 is a more detailed block diagram of the circuit of Fig. 1, and Figures 3 to 5 are schematic views of an ignition switch in the off, start and running positions, in that orderO
Referring to Figures 1 and 2, a conventional automobile ignition system includes a battery 1 connected to ground 2 and 93~
through a lead 3 and an ignition switch 4 to (a) a starter relay coil 5 and park switch 6 via lead 7, (b) an ignition coil 8 via lead 9, and (c~ an accessory fuse ~lock 10 via lead 11. In the off position, the ignition switch is open, i.e.
the lead 3 from the battery 1 is not connected to any of the leads 7, 9 and 11 (Fig. 3). In order to start the vehicle, the gear shift (not shown) is placed in park or neutral to close the park switch 6, which is also connected to ground at 12.
By turning the ignition key, the ignition switch 4 is rotated to the start position (Fig. 4), in which hot lead 3 from the battery is electrically connected via leads 7 and 9 -to the starter relay coil 5 and the ignition coil 8, respectively.
Current flows from the battery 1, to the starter relay coil 5 to actuate the starting motor (not shown) and via the ignition coil 8 to the spark plugs (not shown). The ignition coil 8 is also connected to ground at 13. The qround in each case is the vehicle frame (not shown). In the start position of the ignition switch 4; no contact is made with the lead 11, and consequently, no current flows to the accessory fuse block lO
or the car accessories (heater, radio, etc.).
As soon as the engine has started, the ignition key is released and the ignition switch automatically moves to the running position (Fig. 5). In the running position, current from the battery 1 is constantly fed to the ignition coil 8 and the accessory fuse block 10 to sustain operation of the vehicle engine and per~it use of the accessories. Since current is no longer required for the starting motor,movement of the gear shift out of park with resultant opening of the switch 6 will not affect operation of the vehicle, i.e. the engine will continue to run.
Referring again to Figs. 1 and 2, the override circuit 3~
of the present invention includes a double pole, single throw relay 14 connected directly to the lead 3 from the battery 1 by lead 15. In practice, the lead 15 could be connected to the hot side of the ignition switch (Fig. 2~. In any event, the lead 15 by~passes the ignition switch 4 and directly connects the battery 1 to the relay 14. The relay 14 includes a double pole, single throw switch 16 and a separate coil 17 for closing the switch 16. Contacts 18 on the hot side of the switch 16 are interconnected by a conductor 19, so that current flow through the switch occurs through both outlet conductors 20 and 21 simultaneously or through neither of the conductors 20 or 21.
The conductor 20 is connected to the accossory fuse block 10, and the conductor 21 is connected to the ignition coil 8 and to a timer 22 by a conductor 23. The timer 22 is electrically connected to one terminal 24 of the switch 16 by .
a conductor 25. The other terminal 26 of the coil 17 is :.:
electrically connected to the park switch 6 by conductor 27.
In operation of the override circuit, with the vehicle in park and the engine running, the timer 22 is set, i.e. closed for a predetermined set time. Closing o-f the timer switch causes current to flow through the conductors 9, 23 and 25 to the coil 17, closing the switch 16. With the switch 16 closed, .
current can flow directly through the conductors 3 and 15, the switch 16 and the timer 22 to the coil 17. Because the vehicle is in park, current flows through the conductor 27 and the park switch 6 to ground at point 12 completing an elec-trically conductive circuit which by-passes or overrides the ignition switch 4. In other words the ignition switch can be turned to the off position (Fig. 3) and the key removed, but the engine will continue to run. The ignition coil 8 will receive current from the battery 1 via conductors 3 and 15, switch 16, and 3~
conductors 21 and 23. The accessory fuse block 10 will receiYe current from the battery 1 via the conductors 3 and lS, switch 16 and conductor 20~
As soon as the timer 22 times out, i.e. opens, current ceases to flow to the coil 17 and thus the switch 16 opens to stop the vehicle engine and prevent use of the accessories.
Thus, there has been described an ignition override circuit which permits a driver to start a vehicle engine, and by setting a timer and turning the engine off he can remove -the key and lock the vehicle with the engine still running. The engine will continue to operate until the end of the time period set by the timer. It would be difficult to steal the vehicle because the doors would be locked even though the engine is running. Moreover, with the vehicle in park, the steering wheel would be locked, making it impossible to steal the unattended vehicle. If a person does gain entry to the vehicle, and moves the gear shift lever out of park, the coil of the double pole, single throw relay would become de-energized, which would cause the switch of such relay to open. Thus, the vehicle engine would stop as would current flow to the accessory block.
The only way to re-start the engine is with the ignition key in the normal manner.
It will be appreciated that a variety of circuit breakers can be employed instead of the timer. For example an electronically operated timer such as a linear integrated circuit timing chip, e.g. the so-called 555 Timer available from RCA.
Another alternative is a simple on-off toggle switch;
which when turned on would cause the relay coil to be energized, and when turned off would de-energize the coil and stop the vehicle engine.
3~
of course, with the different vehicle ignition systems presently in use, some minor modifications may be reguired when installing the override circuit of this invention.
' `
;
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An ignition override circuit for use with a conven-tional vehicle ignition circuit of the type including a battery, an ignition switch movable between the park, starting and running positions for connecting the battery to an ignition coil, start-ing means and a park switch controlling operation of said starting means to permit starting of the vehicle engine in the park and neutral positions only of the gear lever, the override circuit comprising relay means connected to said battery and to said ignition coil; coil means for closing said relay means, said coil means being connected to said relay means and to said park switch; and timer means connected to said relay means and to said coil means, whereby, with the vehicle engine operating, closing of the park switch and setting of the timer means closes said relay means to complete a circuit between the battery and the ignition coil by-passing the ignition switch to permit con-tinued operation of the vehicle engine with the ignition switch open for a predetermined set time.
2. An override circuit according to claim 1, wherein said relay means and coil means are both part of a double pole, single throw relay.
3. An override circuit according to claim 1 or 2, wherein said timer means is a linear integrated circuit timing chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000310659A CA1121034A (en) | 1978-09-05 | 1978-09-05 | Ignition override system for motor vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000310659A CA1121034A (en) | 1978-09-05 | 1978-09-05 | Ignition override system for motor vehicles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1121034A true CA1121034A (en) | 1982-03-30 |
Family
ID=4112297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000310659A Expired CA1121034A (en) | 1978-09-05 | 1978-09-05 | Ignition override system for motor vehicles |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1121034A (en) |
-
1978
- 1978-09-05 CA CA000310659A patent/CA1121034A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |