Our valve control unit is a piece of hardware of a driver unit for automotive solenoid valves for test purposes. Application of these valves is typically controlling the fuel pressure and flow in an automotive combustion engine. The name of this driver unit is ValDi, which is the abbreviation for Valve Driver.
ValDi system may be used to define load profiles and control the activation and stress of up to 8 solenoid valves parallel and independently.
The basic functionality of ValDi is the following:
- Applying of currents to hydraulic solenoid valves
- Acquire data
- Processing control loops
- Signal valve status on debug outputs
The hardware may be applied in functional tests or endurance tests. For both, different operation modes may be applied.
The main purpose of ValDi is applying currents to solenoid valves. Generally, the applied current is defined by toggling the output at a specified duty cycle. A minimum inductance of the load is required. Depending on the valve type different current waveforms are used: