US 10,648,385 B2 · Diesel exhaust fluid pressure measuring and control systems and methods

Abstract

A DEF injector is configured to inject DEF into an exhaust system of a vehicle. A DEF pump includes an electric motor configured to drive a compression mechanism and pumps the DEF to the DEF injector. A pressure sensor is configured to measure a pressure of the DEF output from the DEF pump. A sampling module is configured to, based on a rotational position of an output shaft of the electric motor, selectively output samples of the pressure. A measurement module is configured to determine a measured pressure at the pressure sensor based on a present one of the samples and a last one of the samples output before the present one of the samples. A pump control module is configured to apply power from a power source to the electric motor based on a difference between the measured pressure and a target pressure.

Claims20

Dependent claims

A diesel emissions fluid (DEF) control system, comprising:

a DEF injector configured to inject DEF into an exhaust system of a vehicle;
a DEF pump that includes an electric motor configured to drive a compression mechanism and pump the DEF to the DEF injector;
a pressure sensor configured to measure a pressure of the DEF output from the DEF pump;
and
a control module comprising:
a sampling module configured to, based on a rotational position of an output shaft of the electric motor, selectively output samples of the pressure;
a measurement module configured to determine a measured pressure at the pressure sensor based on a present one of the samples and a last one of the samples output before the present one of the samples;
and
a pump control module configured to apply power from a power source to the electric motor based on a difference between the measured pressure and a target pressure.

6 more elements

A diesel emissions fluid (DEF) control method, comprising:

by a DEF injector, injecting DEF into an exhaust system of a vehicle;
by a DEF pump that includes an electric motor configured to drive a compression mechanism, pumping the DEF to the DEF injector;
by a pressure sensor, measuring a pressure of the DEF output from the DEF pump;
based on a rotational position of an output shaft of the electric motor, selectively outputting samples of the pressure;
determining a measured pressure at the pressure sensor based on a present one of the samples and a last one of the samples output before the present one of the samples;
and
applying power from a power source to the electric motor based on a difference between the measured pressure and a target pressure.

4 more elements

Dependencies are inferred from the claim text.

Diesel exhaust fluid pressure measuring and control systems and methods

Life of this patent

Diesel exhaust fluid pressure measuring and control systems and methods

Life of this patent

Abstract

Claims20