cylinder pressure measurement on toyotas?

[Mazda Ebrahimi]

SRavet at bangate.compaq.com wrote:
> 
> I found this paragraph in a TI application note on engine knock detection
> using the 320 series of DSP processors:
> 
> Pressure sensors measure the pressure inside the combustion chamber of a
> running engine. This direct measurement of the combustion process provides
> the best signal to analyze to detect engine knock. However, each cylinder
> requires its own sensor, and individual sensor costs are still relatively
> high. As a result, pressure sensors are used primarily in research
> settings. Currently, Toyota is the only manufacturer that installs pressure
> sensors in production engines. Pressure sensor usage will increase in the
> future as sensor costs are reduced and automotive companies develop more
> sophisticated engine control strategies that monitor the combustion
> process.
> 
> Does anyone know any more about these pressure sensors that Toyota installs
> on production engines?
> 
> --steve
> 
> Steve Ravet
> sravet at bangate.compaq.com
> Baby you're a genius when it comes to cooking up some chili sauce...

The only engines Toyota uses the combustion sensor on is their lean-burn 
engine.  I forget what car it goes in.