Engine shut-down device
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorsAsao Sasaki, Masami Minegishi
Life of this patent
Estimating the term…
Abstract
An engine shut-down control device comprises a shut-down controller for outputting an engine shut-down signal in dependency on a rotation signal generated by an engine rotation when a key switch is turned off and for maintaining self-hold operation until the rotation signal stops, and a start controller for non-electrifying a starter while the rotation signal is output regardless of the position of the key switch. When the key switch is turned off, the shut-down controller automatically holds the device by outputting the engine shut-down signal in dependency on the rotation signal generated from the engine rotation. Namely, the engine shut-down signal is output until the engine completely stops and output of the rotation signal is stopped.
Claims6
An engine shut-down control device mounted on an engine having a starter for starting said engine, a key switch operatively connected to said starter for turning said starter on and off, a shut-down actuator provided to shut down said engine, a magneto for generating electric power and for generating an engine rotation signal dependent on engine rotation when said key switch is turned off, and control means for maintaining output of an engine shut-down signal to said shut-down actuator while said engine rotation signal is generated and for simultaneously terminating output of an engine shut-down signal immediately after said magneto stops output of said engine rotation signal in order to release said shut-down actuator, an improvement of the device which comprises:
- a waveform shaping circuit responsive to said engine rotation signal for converting an alternating current into a pulse wave by rectifying and for producing a pulse signal;
- a conversion circuit responsive to said pulse signal for charging said pulse wave into a pulse frequency and for generating a voltage signal indicative thereof;
- a comparison circuit responsive to said voltage signal for comparing said pulse frequency with a reference voltage and for outputting an operational signal;
- a starter circuit responsive to said engine shut-down signal and said operational signal for maintaining said starter in a non-electrified condition so as to release said shut-down actuator and to prevent said device from wasting electric power when said engine stops.
An engine shut-down control device mounted on an engine having a key switch, a starter, and a shut-down actuator provided to shut down said engine, comprising:
- generating means for generating an alternating output signal synchronized with the rotation of said engine;
- control means for maintaining output of an engine shut-down signal to said shut-down actuator while said generating means generates said alternating output signal and for simultaneously terminating output of said engine shut-down signal when said generating means stops output of said alternating output signal;
- a waveform shaping circuit provided to shape said alternating output signal into pulse waves;
- a conversion circuit provided to convert the number of said pulse waves to a voltage value corresponding to an engine speed;
- a comparison circuit provided to compare said voltage value with a predetermined value representing a predetermined engine speed and to produce an operational signal when said engine rotates;
- and
- starter control means for maintaining said starter in a non-electrified condition in response to said operational signal, so as to prevent said starter from damage.
Dependencies are inferred from the claim text.