Methods and systems for hybrid vehicle power delivery
First Claim
Patent Images
1. A system comprising:
- a hybrid vehicle including an engine and a motor; and
a controller with instructions stored on non-transitory memory thereof for operating the vehicle including;
responsive to each of a lower than threshold torque demand and a lower than threshold state of charge of a system battery, operating the engine at a first compression ratio using an Atkinson cycle; and
responsive to a higher than threshold torque demand, operating the engine at a second compression ratio using an Otto cycle with an octane booster added to injected fuel, wherein the second compression ratio is higher than the first compression ratio.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and systems are provided for adjusting engine operation of a hybrid vehicle to increase power output and fuel efficiency. In one example, a method may include operating the engine using an Atkinson cycle during a lower than threshold engine torque demand and a lower than threshold battery state of charge, and operating the engine using an Otto cycle during a higher than threshold torque demand. During operation in the Otto cycle, an octane booster is injected to the fuel line to increase the octane level in the fuel, if desired.
14 Citations
20 Claims
-
1. A system comprising:
-
a hybrid vehicle including an engine and a motor; and a controller with instructions stored on non-transitory memory thereof for operating the vehicle including; responsive to each of a lower than threshold torque demand and a lower than threshold state of charge of a system battery, operating the engine at a first compression ratio using an Atkinson cycle; and responsive to a higher than threshold torque demand, operating the engine at a second compression ratio using an Otto cycle with an octane booster added to injected fuel, wherein the second compression ratio is higher than the first compression ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A system comprising:
-
a hybrid vehicle comprising an engine and a motor; and a controller with instructions stored on non-transitory memory thereof for operating the hybrid vehicle comprising; propelling the hybrid vehicle using engine torque by injecting a lower octane content fuel into the engine operating with a lower compression ratio, a longer intake valve timing, and a first spark timing; and responsive to an increase in torque demand to above a threshold torque demand, transitioning to propelling the vehicle using engine torque by injecting a higher octane content fuel into the engine operating with a higher compression ratio, a shorter intake valve timing, and a second spark timing advanced relative to the first spark timing, wherein injecting the higher octane content fuel includes, prior to injection of a fuel from a fuel tank, adding an amount of an octane booster from an octane booster reservoir to a fuel line coupling the fuel tank to the engine via an octane booster injector. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
-
-
18. A system for a hybrid vehicle comprising:
-
an electric motor driven by a battery; an engine with a plurality of cylinders; an accelerator pedal coupled to a pedal position sensor; an intake valve, an exhaust valve, a fuel injector, and a spark plug coupled to each of the plurality of cylinders; a fueling system comprising a fuel tank, a fuel pump, and a fuel line, the fuel line delivering a fuel drawn by the fuel pump from the fuel tank to each of the plurality of cylinders via a corresponding fuel injector; an octane booster addition system comprising an octane booster reservoir, an octane booster pump, an octane booster line, and an octane booster injector, the octane booster injector delivering octane booster drawn by the octane booster pump into the fuel line, upstream of the fuel injector; and a controller with computer readable instructions stored on non-transitory memory for; inferring a higher than threshold torque demand based on input from a pedal position sensor; and in response to the higher than threshold torque demand, actuating the octane booster injector to inject an amount of octane booster to the fuel line, where the amount of octane booster injected is based on an octane content of injected fuel; and operating the engine with a higher compression ratio, a shorter intake valve timing, and an advanced spark timing. - View Dependent Claims (19, 20)
-
Specification