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How far did you get with the knock sensor chip? I see that you have it outputting an analog voltage, but it looks like you are stuck trying to find out how to set the RPM against Knock threshold curve, to check it is working? I found some interesting resources that might be of help, as this is some...

They seem to incrementally advance timing until slight knock then back down as soon as knock has been detected. From my understanding, this is ideal only when an engine is octane limited. Meaning that the ideal ignition advance happens after the engine starts knocking. If the engine is not operatin...

TI recently updated the TPIC8101 datasheet. One of the lines that is interesting states: "For a flat-type knock sensor, the bandpass filter design equation can be used to determine where the center frequency should be set." Following that, they give the standard DSP biquad filter equation....

On a cell phone ATM so sound quality is meh. What are value components are you using on the TPIC's input?

From the ohms meter, I find this coil is just 2 coils, it did not appear to have the diodes, but it would have the coils in such a way that you can obtain the ion signal. Generally two terminals are for the logic level triggering circuit and the other two are the connections for the transformer sec...

The only datasheet I could find for a resonant knock sensor is this: http://www.thirdgen.org/forums/attachments/diy-prom/143570d1188275299-knock-sensor-location-early-et_broadband.pdf The datasheet indicates that the sensor outputs 550-1050 mv/g into a 2k ohm load. Delphi provides some information o...

HVM15 - http://www.mouser.com/search/ProductDetail.aspx?R=0virtualkey0virtualkeyHVM15 - description 15 000v, specification 1 500v. They might have an error? Well that's embarrassing. I see that mouser has the HVM15 in stock. However, their search system does not allow you to find the HVM15 based on...

russian wrote:@ needs help locating high-voltage diodes on digikey. Should be 10-15kV Voltage - DC Reverse, like hvm15

The only diodes I can find are several hundred dollars. How about using multiple lower cost diodes in series?

thanks for the comment. regarding schemes with a charge from the ignition coil - capacitor is quickly discharged and will not give an accurate picture of the ION current. to get a beautiful picture need a current mirror with external power. How about increasing the gain of the measurement amplifier...

As I suspected, this sensor's voltage output is one or two orders of magnitude larger than the sensors in the application examples TI provided. The attenuator seems to have resolved the issue. However, I do I need to do a little more fine tuning. Here's the most recent log. This is with the digital ...

You may also have too much gain from the sensor, have you tried to induce knock? if so then how far above the noise floor is the knock signal. Your sensor is likely to have a different internal resistance and capacitance so you could try tweaking the input stage to try and optimise the impedance ma...

What window are you using? I am using 40-130 degrees ATDC. How is the knock sensor mounted? it is very important that the mounting surfaces are flat and the sensor is correctly torqued. It is mounted to block via factory knock sensor boss (just below the cylinder head between cylinders 2 and 3). It...

Wide open throttle pulls on the road and free revving the engine results in the integrator output increasing with the rpm. I'm about 90% confident that the engine is not knocking. I believe that's expected behavior - engine noise increases with increase in RPM so you need your knock detection thres...

I've been pulling my hair out all day trying to figure out what is going on here. Wide open throttle pulls on the road and free revving the engine results in the integrator output increasing with the rpm. I'm about 90% confident that the engine is not knocking. Since the car has no sound deadening, ...

I think this has been proven good enough for a bench test already, eventually a real test would be needed. My next step is to try running on gas+diesel mixture and help me god. Take the car for a drive to put a load on it. If your exhaust isn't too loud, do a wide open throttle run and listen for k...

Perhaps you should try to create an audible knock (you can hear it with your own ears) and then take a look at the TPIC output. I am doing some on car testing myself today. My hardware and algorithms are a little bit different, but the data should still be relevant. I'll report back when I have more...

It's been awhile since I have played with the SVN software. Attaching a patch that should fix the file paths. Hopefully I did this correctly.

That is my fault for not mentioning what IC to use. VN750PS-E seemed to be most appropriate the task. There are several other high side drivers, both lower and higher current ratings, in the 8-SO package. The thermal vias are indeed supposed to be offset. The VN750PS-E does not have a thermal pad on...

I finally found some spare time to come back to this. If we consider the MOSI circuit to be purely an RC circuit, your MOSI line had just under 70 picoFarads of capacitance. That sounds very high. Was your probe in 10x mode? Was your logic analyzer or any other device connected to the MOSI line?

What do you think about this?

https://oshpark.com/shared_projects/pz6SVaJU

Do you want the board to use any type of terminals for input/output connections, or do you plan on soldering wires directly to the board? Just solding. Solid wires for signals, 18-20 ga wires for power lines, 0.052 inch diameter works good for 20 ga Failing to read what we use for heat sink holes, ...

19.79x21.69 mm-ish? that's a totally random number, that's the DDPAK board dimensions. 20x22mm to make it even? I need to double-check how much vertical space is inside this mazda case, I am planning to mount it vertically with a couple of 90 degrees pins. BTW would be nice to have unused/mounting/...

https://644db4de3505c40a0444-327723bce298e3ff5813fb42baeefbaa.ssl.cf1.rackcdn.com/uploads/project/top_image/kpYpQ1tg/i.png Looks like we can get a bit smaller board without much change in the functionality. Larger heat sink holes would allow to get 0.4mm soldering wire in there - like on https://ww...

Also, if you want to get really crazy, I can make a GPIO expansion board. For example, use three digital outputs from the STM32 to control 8, 16, or more outputs. The downside is changing the state of one of the outputs would take 10-100 microseconds longer depending on the communication protocol an...

I am re-doing my own ECU based on the 0.4 revision and I want to put everything inside the case in the prototyping area (some stuff used to be hanging on the wires). The PowerSSO-24 power boards is just too large and we probably do not really need 43A output anyway? I think we need a board for the ...

See page 16 found here http://www.ti.com/lit/ds/symlink/tpic8101.pdf they have that 470pF on the Xin and driven by the MCU. C169 is being used to get an initial upset in the XTAL circuit which gets it started. I suspect the TPIC has changed the internal gain or some startup circuit which has made i...

Is C169 really necessary ? (I just looked at SECU4 and there is no such workarround for startup.) OSCIN with C169 (470p??) has low impedance to "ground" (CS is tighted to log. 0 or log. 1 which is almost ground for oscilator, is not it ?) If you have troubles with startup of oscillator, s...

I designed R177 per Figure 15. Negative Resistance Measuring Circuit on this PDF page 11. Take note it specifies you increase the Rq until you hit the max. The XTAL's ESR is 80 ohms, or should be 80 ohms assuming china populated the correct part(s). Being 8 megs, and seeing that 7.99 megs it 100 oh...

I've installed 47pF C169 and now I need to hold my finger to have the thing running. As a second step I've replaced R177 with a 0R resistor and now I see the slope on the oscilloscope. Is it time to make these 47pf and 0R values official? I believe that on the rev 0.1 board the trick was to remove ...

With the new code engineConfiguration->spi2SckMode = PAL_STM32_OTYPE_OPENDRAIN; engineConfiguration->spi2MosiMode = PAL_STM32_OTYPE_OPENDRAIN; engineConfiguration->spi2MisoMode = PAL_STM32_PUDR_PULLUP; boardConfiguration->hip9011IntHoldPinMode = OM_OPENDRAIN; outputPinRegisterExt2("hip CS"...