With the induction coil shown here the circuit draws about 5A from a 15V supply when a screwdriver tip is heated.
If you go to http: I'll try to get an even better picture: Comb contact, showing evidence of wiping contact, but practically no wear.
De-Oxit D5 would go a long way to lubing and protecting this area to delay wear. Throttle Position Sensing Switch In exercising the search function, detailed info on the TPS is sparse, and in the case of this publication, even highly imaginative It is simply not possible for the sliding contact or alternate comb contacts to "begin to arc as the throttle is held at a steady position" Lack of lubrication between the board conductors and never-ending motion of the sliding contact can cause wear this is where the correct lubrication comes inbut no arcing or carbonization ever takes place!
Throttle opening is signaled by the TPS through alternating ground signals from two inter-digitated traces that are each connected to the inputs of a flip-flop see sheet 2 of the schematic for a drawing of the switch details. A drag switch in the TPS prevents these signals from being sent when the throttle is closing.
The outputs of the flip-flop are sent to two edge detectors, whose outputs are combined and sent to pulse shaping and narrowing circuits. The pulse shaper provides immediate injection pulses to the IL Injection Logic. The width of these pulses is independent of engine speed and load, and from Kerfoot's schematic, they are about 1.
Adjustment of the IA has no effect on mixture when the throttle is open. TPS Idle switch, full-load switch if presentand immediate accelerator track switches 3-way switch to accommodate all TPS types Adjustment procedure for TPS: See detailed dwg of TPS internals.
Anders; I have seen your excellent work on the D-Jetronic for years now and have to compliment you on your dedication and work, and efforts to present it on your site! I am involved with the Volvo clubs, and as you are undoubtedly aware, the D-Jet was used in several models from this manufacturer.
I am also an EE with heavy hands-on factor as yourself and am currently very interested in understanding the TPS and really getting to the root-cause of its' well known "cough at cruise" symptom.
I have some thoughts on this I would like to discuss with someone who I can really "talk turkey" with, and who knows the difference between a negative edge triggered Flip-Flop and a hole in the ground I don't know if you got the message, but out of the blue like that, I might not respond to a message from a non-Porsche guy either, but I ask again if you might be so kind to allocate a few minutes of your precious time to discuss the finer points of the TPS with me, a fellow vintage car guy and D-Jet friend, I would very much appreciate it I had a real laugh when I ran across this: Having studied the switch at length including the VW version with WOT contactI actually don't think the comb contacts have much to do with the cough at cruise at all, because according to my initial inspection, the sliding contact which supplies the comb conductors with ground and thereby a Neg edge to trigger the Flop is smaller in OD than the insulated space between combs comb-wear and conductor smearing notwithstanding I believe it is instead the hysterisis or lack thereof of the drag-switch which causes the cough I've seen "2degrees" shaft rotation because of a momentary switching to Idle which would result in a lean stumble.
I think this is rather the root-cause not "arcing" or "comb-conductor wear"but again, this is what I would dearly like to discuss in depth with you.
My goal is to generate the complete and definitive documentation on this issue, including tests, adjustment and maintenance recommendations. Diameter of the slider contact which sweeps comb conductors is smaller than the spacing between comb conductive teeth Sliding contact can actually be between the two combs also, not making contact with either!
This is also consistent with the negative edge triggered Flip-Flop inputs the two combs are connected to at the ECU, where the two inputs would be triggered alternately in operation Note 1. Therefore, three contact conditions can exist: Contact with one comb term 9OR contact with the other comb term 20OR between the two, and not making contact with either comb open.
Flip-Flop T,T remains un-triggered, and in a stable condition, holding last state. As the Flip-Flop is an edge triggered circuit, it changes state at the first valid comb contact input, locking out ANY subsequent contacts and in this manner exhibits high immunity to repeated or false triggersalso, the only time Flip-Flop changes state is during CCW throttle opening rotation because Comb Selector Contact of Drag Switch is only closed during CCW rotation!
In this way TPS is direction sensitive. Idle Switch grounds terminal 17, when Throttle shaft is closed turned CW. Since Dragswitch powering comb slider is in essentially a SPDT configuration with Idle Switch, providing ground to either is exclusive of the other. In other words, only one of the two circuits is enabled, at any time, as a function of Throttle Shaft direction.2.
Simple techniques for production of dried meat. PRINCIPLES OF MEAT DRYING.
Drying meat under natural temperatures, humidity and circulation of the air, including direct influence of sun rays, is the oldest method of meat preservation. of a so-called general circulation is shown below.
What part. pulmonary circulation pump, sending the carbon dioxide—rich A simple schematic of a so-called general circulation is shown below. What part. A SIMPLE SCHEMATIC OF .
A further explanation of the Coriolis effect (Section ) is provided by Fig 1. The left part (a) shows a westerly wind blowing over Australia. Part (b) shows the wind blowing in the same direction (as seen in a fixed frame of reference) three hours later, when the Earth’s .
Exercise 30 Anatomy of the Heart. Chorda, Fossa, A simple schematic of a so-called general circulation is shown below. What part of the circulation is missing from this diagram? Pulmonary circulation. Add to the diagram as best you can to make it depict a complete.
Systemic arteries Systemic capillaries Systemic veins pulmonary circulation. The energy input from the sun is fixed at an assumed Watts per sq. meter. The radiative fluxes use the Stefan-Boltzmann equation (sigma T^^4), where T is either the surface or atmospheric temperature.
Fig. 7 shows the throttle valve switch in the plan view with cut cover. The throttle idle micro-switch of forming contacts a by the lever c connected rigidly with the .