# Voltage output pressure transducer ?

1. Mar 30, 2009

### hitman2hire

Hi everyone !

I am new here. I am currently a mechanical engineering student who's doing a project involving control systems and regenerative braking. So far my system of parts include a Pressure transducer attached to a foot pedal. When the brakes are applied the pressure transducer will send a signal to alert a linear electro-mechanical actuator to engage a clutch which will in turn enable an electric motor to start generating electricity and due to its electrical load also apply some sort of braking force. I am currently using Simulink to create a simulation of what would be happening, however i need to know some formula's before hand.

I have a question regarding Pressure Transducers and wanted to know if there is any formula or method on how to calculate amount of voltage generated say from the pressure transducer fitted to a brake pedal. I also don't even have any clue on how much pressure is typically generated by someone applying his foot on the brake pedal of a car while braking. My main aim is to somewhat calibrate a brake pedal pressure transducer to the amount of voltage (can also be current) generated. The voltage will be fed to a controller and if it happens to exceed a certain pressure limit braking will occur. Oh also the pressure transducer i will be using would be a Voltage (or current) output Pressure transducer.

Please would anyone be able to post me any sort of feed back on this, anything would be helpfull, thanks in advance =)

2. Mar 30, 2009

### FredGarvin

The output will depend on the transducer. There will be some that have different ranges of output as well as certain percentages of inaccuracy. A typical output level is 0-10V full scale. A typical inaccuracy is on the order of 1-5% full scale reading. Obviously the cheaper the transducer, the less performance and accuracy you will get.

3. Mar 30, 2009

### Integral

Staff Emeritus
If you are using a actuator to engage a clutch it is not clear what the advantage of a analog sensor at the brake is. Could you not accomplish the same thing easier with a mirco switch?

4. Mar 30, 2009

### Staff: Mentor

Btw, the output is typically linear.