Abstract: Systems, methods, and computer-readable media are disclosed for a pulse switched high side driver for vehicle sensor. An example method may include switching a transistor of a vehicle circuit to connect a first resistor to a vehicle sensor for a first time period in which exhaust gas temperature values of the vehicle are within a first range of exhaust gas temperatures values. The example method may also include switching, by providing a pulse-width modulation (PWM) signal with an on signal value, the transistor to connect a second resistor to a vehicle sensor for a second period of time in which exhaust gas temperature values of the vehicle are within a second range of exhaust gas temperatures values that are greater than the first range of exhaust gas temperature values, wherein the second resistor and vehicle sensor are also included in the vehicle circuit, wherein the second resistor is in parallel with a first resistor and connected between the transistor and the vehicle sensor.

Abstract: Systems, methods, and computer-readable media are disclosed for a pulse switched high side driver for vehicle sensor. An example method may include switching a transistor of a vehicle circuit to connect a first resistor to a vehicle sensor for a first time period in which exhaust gas temperature values of the vehicle are within a first range of exhaust gas temperatures values. The example method may also include switching, by providing a pulse-width modulation (PWM) signal with an on signal value, the transistor to connect a second resistor to a vehicle sensor for a second period of time in which exhaust gas temperature values of the vehicle are within a second range of exhaust gas temperatures values that are greater than the first range of exhaust gas temperature values, wherein the second resistor and vehicle sensor are also included in the vehicle circuit, wherein the second resistor is in parallel with a first resistor and connected between the transistor and the vehicle sensor.

Abstract: An emissions control system for a vehicle configured to travel on a road is provided. In one example, a forced modulation of a UEGO is provided when output of a HEGO sensor is unavailable.

Abstract: An emissions control system for a vehicle configured to travel on a road is provided. The system typically includes a catalyst coupled to the exhaust gas path, a linear universal exhaust gas oxygen (UEGO) sensor coupled to the exhaust gas path upstream of the catalyst and configured to measure oxygen content in exhaust gas from the engine upstream of the catalyst, and a heated exhaust gas oxygen (HEGO) sensor positioned adjacent the catalyst and configured to measure oxygen content in exhaust gas from the engine. The system further typically includes a controller coupled to the engine and configured to, during a warm up period of the catalyst during which input from the HEGO sensor is unavailable, adjust an engine air-fuel ratio of the engine in response to the input from the linear exhaust gas oxygen sensor, and further configured to provide modulation of said air-fuel ratio during the warm up period so that the air-fuel ratio of the engine oscillates about a selected target ratio.

Abstract: An emissions control system for a vehicle configured to travel on a road is provided. The system typically includes a catalyst coupled to the exhaust gas path; a linear universal exhaust gas oxygen (UEGO) sensor coupled to the exhaust gas path upstream of the catalyst and configured to measure oxygen content in exhaust gas from the engine upstream of the catalyst; a heated exhaust gas oxygen (HEGO) sensor positioned adjacent the catalyst and configured to measure oxygen content in exhaust gas from the engine; a temperature sensor coupled to the engine; and a controller coupled to the engine and configured to receive an input signal from the HEGO sensor that is indicative of oxygen content in the exhaust gas, to receive an input signal from the temperature sensor that is indicative of engine temperature, to adjust the HEGO sensor input signal based on the input signal from the temperature sensor, and to control the air-fuel ratio based on the adjusted HEGO sensor input during engine warm up.