GB2024940A
Expired / Lapsed
GB
⏱️ 0.0 years remaining
System for controlling preheating of an engine having glow plugs
Assignee: Isuzu Motors Ltd
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Filing: 1979-07-03
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Granted: —
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Expires: 1999-07-03
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
GB
Data Source
google_patents
Last Synchronized
2026-11-06 14:11
CPC Classifications
F; F02; F02P; F02P19/00; F02P19/02; F02P19/025; F02B; F02B3/00; F02B3/06; F02P19/021; F02P19/023
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
89 words
A preheating control system for an engine having a glow plug comprising the glow plug, a battery, a quick heating circuit having an extremely small resistance value compared to the glow plug, a stabilizing circuit having a relatively large resistance value compared to the glow plug, and means to determine when the resistance of the glow plug reaches a resistance value corresponding to a predetermined temperature, whereby in use, the current flow from the battery through the quick heating circuit is rapidly terminated upon reaching said predetermined temperature. -
Claim 2
Dependent Claim
89 words
A preheating control system for an engine having a glow plug comprising the glow plug, a battery, a quick heating circuit having an extremely small resistance value compared to the glow plug, a stabilizing circuit having a relatively large resistance value compared to the glow plug, and means to determine when the resistance of the glow plug reaches a resistance value corresponding to a predetermined temperature, whereby in use, the current flow from the battery through the quick heating circuit is rapidly terminated upon reaching said predetermined temperature. -
Claim 3
Dependent Claim
23 words
A system according to claim 1 in which the glow plug comprises a heating element having a repeatable resistance value at any temperature.
Claim 4
Dependent Claim
46 words
A system according to claim 1 or claim 2 in which said means to determine comprises a bridge circuit in which said glow plug forms one arm thereof, a detector resistor forms a second arm, and a pair of fixed resistors form third and fourth arms.
Claim 5
Dependent Claim
32 words
A system according to claim 1 or claim 2 further comprising means to selectively switch said quick heating circuit or said stabilizing circuit in series between said battery and said flow plug.
Claim 6
Dependent Claim
39 words
A system according to claim 4 in which said means to selectively switch comprises a relay having a pair of energizable coils and a pair of normally open contact points and a control circuit for selectively energising said coils.
Claim 7
Dependent Claim
55 words
A preheating system substantially as hereinbefore described with reference to and as shown in Figure 1 of the accompanying drawings. Printed for Her Majesty's Stationery Office by the Courier Press, Leamington Spa, 1980. Published by the Patent Office, 25 Southampton Buildings, London, WC2A lAY, from which copies may be obtained. W J z h, k
Claim 8
Dependent Claim
55 words
A preheating system substantially as hereinbefore described with reference to and as shown in Figure 1 of the accompanying drawings. Printed for Her Majesty's Stationery Office by the Courier Press, Leamington Spa, 1980. Published by the Patent Office, 25 Southampton Buildings, London, WC2A lAY, from which copies may be obtained. W J z h, k
References Cited (Backward Citations)
No citation records indexed.
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