Injection device

摘要

The invention relates to a device for injecting a fluid (2), in particular into the exhaust-gas section of an internal combustion engine, having a reservoir (4) for storing the fluid (2) to be injected; an injection and metering module (10); a pump (8) which is configured for conveying fluid (2) during operation out of the reservoir (4) to the injection and metering module (10); and a return line (16) which makes an outflow of fluid (2) out of the injection and metering module (10) possible, wherein a switchable throttling valve (14) which is suitable for pumping fluid out of the injection and metering module (10) is arranged in the return line (16).

主权项

1. A device for injecting a fluid (2), the device comprising:
a reservoir (4) for storing the fluid (2) to be injected; an injection and dosing module (10); a pump (8) which, during operation, delivers the fluid (2) from the reservoir (4) to the injection and dosing module (10); and a return line (16) which permits an outflow of fluid (2) from the injection and dosing module (10), wherein a switchable throttle valve (14) operable as a pump for pumping fluid out of the injection and dosing module (10) is arranged in the return line (16), wherein, alternatively to pumping fluid out of the injection and dosing module, the throttle valve is further configured to selectively operate in a fully closed state, a fully opened state, and a partially opened state.