Stone working – Turning – Grinding-wheel dressing
Patent
1991-07-23
1992-07-28
Dolinar, Andrew M.
Stone working
Turning
Grinding-wheel dressing
12317915, 12317916, 123491, F02D 4106
Patent
active
051333112
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a control unit and more particularly to an auxiliary control unit which is connected to a resistor having a high-temperature coefficient used to detect the engine temperature or the temperature of the engine coolant, and which coacts with a control system which functions to adapt the fuel-injection and timing of the engine while driving the engine until the engine is warm.
An engine which is equipped with this type of control system incorporating an NTC-resistor (negative temperature coefficient) will normally start easily within a normal operating range of between +5.degree. C. and +20.degree. C. Problems occur, however, when the engine is subjected to load immediately upon being started-up, for instance when the driver of the vehicle moves the gear into drive and commences to drive the vehicle immediately, or when the air condition system is operative or the servo pump is working The engine will then tend to die, therewith necessitating a restart. This is said to be due to a combination of factors relating to engine temperature, poor fuel supply and, in some cases, fuel starvation due, inter alia, to carbon deposits on the suction valve.
In accordance with the invention, this problem is solved by providing an auxiliary control unit having the characteristic features set forth below.
The invention will now be described in more detail with reference to the accompanying drawings, in which
FIG. 1 illustrates very schematically in block form a control system for an internal combustion engine and shows the location of the inventive auxiliary control unit;
FIG. 2 is a block schematic of one embodiment of the inventive auxiliary control unit; and
FIG. 3 illustrates the circuitry of one embodiment of the inventive auxiliary control unit.
Like components have been identified with like reference signs in all three figures of the drawings.
In the arrangement illustrated in FIG. 1, the positive terminal of a battery 2 is connected to the voltage supply of a conventional vehicle-engine control system 5, via an ignition lock switch 3 The control system 5 is operative to control the amount of fuel delivered to the engine and is connected to an engine temperature sensor or an engine coolant sensor in the form of a resistor 6 having a high temperature coefficient. The resistor used will normally have a negative temperature coefficient, known as an NTC-resistor, although the use of a resistor which has a positive temperature coefficient is not excluded. The output signals of the control system are functions, inter alia, of the temperature detected by the resistor 6.
In accordance with the invention, an auxiliary control unit 7 is also connected to the resistor 6. Voltage is supplied to the auxiliary control unit 7 in the same manner as that in which voltage is supplied to the control system 5, and the auxiliary control unit 7 has an input TRIGG, which in the case of the illustrated embodiment is connected to the oil-pressure monitor-switch 4 of the engine, this monitor-switch being connected to the positive terminal of the battery via an oil-pressure lamp 8 and the aforesaidignition lock 3. When the oil-pressure monitor-switch is broken, the oil-pressure lamp 8 is extinguished and the potential on the input TRIGG will therefore be high, therewith triggering the inventive auxiliary control unit.
The significant factor with the signal TRIGG is that the engine will have started before the auxiliary control unit is triggered. This is necessary in order to prevent an erroneous NTC-voltage from deceiving the .lambda.-probe integrator, i.e. when a temperature beneath about 14.degree. C. is registered at the very moment of starting the engine, the probe-start is delayed, resulting in emission problems. Generator voltage, engine speed etc. may also constitute trigger parameters which can be used in the present context, i.e. other than oil-pressure.
In accordance with the present invention, on the occurrence of a cold engine-start, where the temperature of the engine is, for instance, between +5.degr
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patent: 3705571 (1972-12-01), Horn et al.
patent: 4089317 (1978-05-01), Drews et al.
patent: 4132210 (1979-01-01), Long
patent: 4205635 (1980-06-01), Kirn et al.
patent: 4437445 (1984-03-01), Takahashi et al.
AB Volvo
Dolinar Andrew M.
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