Engine control system
First Claim
1. An internal combustion engine and control system comprising elements defining at least one combustion chamber the volume of which varies cyclically during engine operation, an induction and charge forming system for delivering a fuel air charge to said combustion chamber for combustion therein, said induction and charge forming system including a throttle valve for controlling the air flow to said engine, a speed control element movable between an idle position through a pick up position to a full throttle position for operator control of the speed of said engine, a throttle control for providing an operative connection between said speed control element and said throttle valve for operator control of said throttle valve, stop means for retaining said throttle valve in a partially opened idle position wherein the effective flow area past said throttle valve is substantially greater than required for idle operation, said throttle control permitting movement of said speed control element from its idle position to its pick up position prior to opening movement of said throttle valve and for effecting opening of said throttle valve from its partially opened throttle position to a wide open throttle position upon movement of said speed control element from its pick up position to its full throttle position, an ignition system for firing the fuel air charge in said combustion chamber, an exhaust system for discharging exhaust gases from said combustion chamber to the engine, and means for controlling the speed of the engine during movement of the speed control element from its idle position to its pick-up position primarily by retarding the spark timing beyond the normal spark timing required for a given engine running condition.
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Accused Products
Abstract
A number of embodiments of engine control systems wherein the engine speed is controlled during a range of movement from idle to a pick-up position by varying primarily the spark timing and thereafter the throttle valve is opened. The throttle valve is maintained in its idle position in a partially open position which will permit greater air flow than required for idle and the speed is controlled by retarding the spark. In addition, further spark retardation is accomplished if the temperature of the engine is below a predetermined minimum desired operating condition for transferring more fuel energy to engine heating than power output for promoting more rapid warmup.
39 Citations
29 Claims
- 1. An internal combustion engine and control system comprising elements defining at least one combustion chamber the volume of which varies cyclically during engine operation, an induction and charge forming system for delivering a fuel air charge to said combustion chamber for combustion therein, said induction and charge forming system including a throttle valve for controlling the air flow to said engine, a speed control element movable between an idle position through a pick up position to a full throttle position for operator control of the speed of said engine, a throttle control for providing an operative connection between said speed control element and said throttle valve for operator control of said throttle valve, stop means for retaining said throttle valve in a partially opened idle position wherein the effective flow area past said throttle valve is substantially greater than required for idle operation, said throttle control permitting movement of said speed control element from its idle position to its pick up position prior to opening movement of said throttle valve and for effecting opening of said throttle valve from its partially opened throttle position to a wide open throttle position upon movement of said speed control element from its pick up position to its full throttle position, an ignition system for firing the fuel air charge in said combustion chamber, an exhaust system for discharging exhaust gases from said combustion chamber to the engine, and means for controlling the speed of the engine during movement of the speed control element from its idle position to its pick-up position primarily by retarding the spark timing beyond the normal spark timing required for a given engine running condition.
- 14. An internal combustion engine and control system comprising elements defining at least one combustion chamber the volume of which vary cyclically during engine operation, an induction and charge forming system for delivering a fuel air charge to said combustion chamber for combustion therein, and ignition system for firing the fuel air charge in said such combustion chamber, an exhaust system for discharging exhaust gases from said combustion chamber to the atmosphere, an operator control for controlling the speed of said engine, spark control means responsive at least to the condition of said operator control for varying the spark timing and response to the operator demand, temperature sensing means, and means for retarding the timing of spark firing from normal if the temperature falls below a predetermined temperature for generating more heat to the engine for rapidly heating the engine.
- 18. An internal combustion engine and control method, said engine comprising elements defining at least one combustion chamber the volume of which varies cyclically during engine operation, an induction and charge forming system for delivering a fuel air charge to said combustion chamber for combustion therein, said induction and charge forming system including a throttle valve for controlling the air flow to said engine, a speed control element movable between an idle position through a pick up position to a full throttle position for operator control of the speed of said engine, a throttle control for providing an operative connection between said speed control element and said throttle valve for operator control of said throttle valve, stop means for retaining said throttle valve in a partially opened idle position wherein the effective flow area past said throttle valve is substantially greater than required for idle operation, said throttle control permitting movement of said speed control element from its idle position to its pick up position prior to opening movement of said throttle valve and for effecting opening of said throttle valve from its partially opened throttle position to a wide open throttle position upon movement of said speed control element from its pick up position to its full throttle position, an ignition system for firing the fuel air charge in said combustion chamber, an exhaust system for discharging exhaust gases from said combustion chamber to the engine, said method comprising the steps of controlling the speed of the engine during movement of the speed control element from its idle position to its pick-up position primarily by retarding the spark timing beyond the normal spark timing required for a given engine running condition.
- 26. An internal combustion engine and control method, said engine comprising elements defining at least one combustion chamber the volume of which vary cyclically during engine operation, an induction and charge forming system for delivering a fuel air charge to said combustion chamber for combustion therein, and ignition system for firing the fuel air charge in said such combustion chamber, an exhaust system for discharging exhaust gases from said combustion chamber to the atmosphere, an operator control for controlling the speed of said engine, spark control means responsive at least to the condition of said operator control for varying the spark timing and response to the operator demand, said method comprising the steps of sensing the temperature, and retarding the timing of spark firing from normal if the temperature falls below a predetermined temperature for generating more heat to the engine for rapidly heating the engine.
Specification