Suzuki Jidosha Kogyo Kabushiki Kaisha

Suzuki Motor Corporation

Kazuhiro Umehara

Keisuke Daikoku

Toshiya Kataoka

Tsugio Sugimoto

A method and apparatus for detecting engine overheating and controlling engine ignition timing utilizes a single temperature sensor. The temperature sensor is positioned adjacent a cylinder head of an engine. A rate of engine temperature increase is calculated based on engine temperature information produced by the temperature sensor, and engine speed is regulated based on the calculated rate of engine temperature increase. Ignition timing is also controlled in response to the engine temperature information produced by the temperature sensor, and the engine speed is regulated to a predetermined speed value whenever the engine temperature exceeds a predetermined temperature value.

Overheat detecting apparatus for engine

An apparatus for controlling an ignition timing for a marine engine has a temperature sensor for detecting a cold or warm-up state of the engine and for outputting an ON/OFF signal, and has an ignition timing controller for receiving the signal from the temperature sensor, for receiving signals representing an engine rotational speed and a throttle opening degree which are sent from other sensors, and for setting an optimum ignition timing. The ignition timing controller includes a spark advance control arrangement for setting the ignition timing to a state in which it is spark advanced by a predetermined angle when a cold signal from the temperature sensor is input, a first spark delay control arrangement for immediately setting the ignition timing to a spark delay state when the engine rotational speed reaches an unshiftable rotational speed after completion of the operation of said spark advance, and a second spark delay control arrangement for immediately setting the ignition timeing to the spark delay state when a warm-up signal is input from the temperature sensor.

Method and apparatus for controlling ignition timing for marine engine

A method for controlling an engine for a marine vessel which includes, when a sudden fluctuation of a load is to be generated due to connecting or disconnecting of a load at a low speed of the engine, the step of advancing the spark ignition timing by a few degrees at the time the connecting or disconnecting is performed. A different feature is a method which includes, when the throttle opening of an engine for a marine vessel is changed from a predetermined opening degree to a substantially closed state, the step of advancing the spark ignition timing by a few degrees.

Method for controlling ignition timing of an engine for marine vessels

An audio alarm outputting device for an outboard engine includes a plurality of sensors for detecting abnormalities, such as in the cooling water flow, and a speech outputting circuit for receiving output signals from the plurality of sensors and outputting abnormal conditions of the signals in a vocalized form. A variable voice level setting circuit cooperable with the speech outputting circuit automatically increases in steps the output level of the speech outputting circuit as the engine speed increases.

Audio alarm outputting device for outboard engine

An apparatus for use in an outboard engine provides a voice alarm output when an abnormality of cooling water or the like is detected during operation of a radio or the like, the abnormal state being announced with a synthesized voice. The apparatus has a plurality of sensors for detecting the abnormality of the cooling water and the like, and a voice output circuit to receive detection signals from the sensors and to output a synthesized voice signal identifying the abnormal state. An acoustic reproducing apparatus such as a radio is provided, and a common speaker is used to output the radio output or the voice output signal of the voice output circuit. A voice discriminating switching circuit is provided between the voice output circuit and the acoustic reproducing apparatus. The voice discriminating circuit detects the level of an output signal of the voice output circuit and temporarily switches the speaker from the acoustic reproducing apparatus to the voice output circuit in response to the level.

Apparatus for outboard engine for switching to voice alarm output

A vocal alarm arrangement includes a plurality of sensors, including a sensor for detecting an abnormality in cooling water, a sensor for detecting an abnormality in an oil level, and the like, and also includes a voice outputting circuit to which outputs from the sensors are coupled and which displays abnormalities in a vocalized form, the outputs from the plurality of sensors being given a predetermined order of priority, and the signals from the sensors being processed in accordance with the specified order of priority so abnormalities are presented as alarms in a vocalized form according to such order priority.

Vocal alarm for outboard engine

A rotational speed control system for an engine includes controls for determining whether the throttle is closed beyond a predetermined position, whether the engine is mechanically loaded, and whether the engine rotational speed exceeds a predetermined speed. A control delays the ignition timing of the engine when the throttle is closed beyond the predetermined position, the engine is not mechanically loaded, and the rotational speed exceeds the predetermined speed.

Idling rotating speed control system of outboard engine

A display control apparatus for use in an internal combustion engine includes: a CDI type ignition circuit; an overspeed preventing circuit which can limit the engine speed to a restricted value; a first LED display unit of the light on/off type to display the amounts of oil and/or cooling water; a second LED display unit to display the circulation state of the oil and/or cooling water; and a drive circuit which switches the first and second display units to an alarm display mode and causes the overspeed preventing circuit to limit engine speed when abnormal states of the oil and/or cooling water are detected by oil level switches or by water and oil flow sensors. If power ceases, the display state is held by keep relays. When an abnormal state is detected, the driver is warned by lighting up of red LEDs and by generating a beeping sound from a buzzer.

Display control apparatus for use in internal combustion engine

A float switch and a control apparatus of an internal combustion engine are disclosed. This float switch comprises a float attached to a main body so as to be vertically swung around one end thereof, a magnetic material fixed to the float, and a contact adapted to be closed or opened in response to the approach or removal of the magnetic material. The float switch is provided in the pathway of a collant passage and a lubricating oil passage of the engine. The control apparatus has a warning apparatus which is operative in response to an absence signal from the float switch which is indicative of the absence of the fluid that is being sensed, and has a rotating speed control apparatus to reduce the engine speed. The absence of the fluid is informed to the operator by the warning and the speed reduction. A warning apparatus for an outboard engine to control the engine speed when an abnormality occurs is also provided. This apparatus comprises a rotating speed detecting circuit, a circuit to set the engine rotating speed in correspondence to the abnormality, and a circuit to suppress the engine speed when the detected speed exceeds a preset value. The rotating speed is also reduced when coolant is not sufficiently supplied into the water jacket or when the engine lacks oil.

Float switch, a control apparatus and a warning apparatus of an engine

An ignition apparatus has an electrically controlled spark advance mechanism. It includes first ignition signal output circuit to output a first ignition timing signal with a predetermined spark advance synchronously with engine rotation, a second ignition signal output circuit to output for trolling a second ignition timing signal delayed by a predetermined crankshaft angle from the first ignition timing signal, a spark advance operating circuit to perform an arithmetic operation based on the first ignition timing signal and to output a third ignition timing signal which advances or delays the ignition timing as engine speed increases or decreases, a first ignition timing setting circuit which uses the first ignition timing signal for ignition timing for a predetermined time after the start of the engine and which thereafter uses the second ignition timing signal; and a second ignition timing setting circuit which, when the engine is accelerated before the predetermined time elapses, uses the third ignition timing signal for ignition timing.

Ignition apparatus

A float switch and a control apparatus of an internal combustion engine are disclosed. This float switch comprises a float attached to a main body so as to be vertically swung around one end thereof, a magnetic material fixed to the float, and a contact adapted to be closed or opened in response to the approach or removal of the magnetic material. The float switch is provided in the pathway of a coolant passage and a lubricating oil passage of the engine. The control apparatus has a warning apparatus which is operative in response to an absence signal from the float switch which is indicative of the absence of the fluid that is being sensed, and has a rotating speed control apparatus to reduce the engine speed. The absence of the fluid is informed to the operator by the warning and the speed reduction. A warning apparatus for an outboard engine to control the engine speed when an abnormality occurs is also provided. This apparatus comprises a rotating speed detecting circuit, a circuit to set the engine rotating speed in correspondence to the abnormality, and a circuit to suppress the engine speed when the detected speed exceeds a preset value. The rotating speed is also reduced when coolant is not sufficiently supplied into the water jacket or when the engine lacks oil.

A rotating speed control apparatus for controlling the rotating speed of an internal combustion engine includes: an ignition circuit of a capacitive discharge ignition (CDI) system; an overspeed preventing circuit having a rotating speed detecting circuit for reducing the rotating speed of the engine to a restricted value in response to an overspeed condition; and a cut-off circuit which temporarily inhibits the control of the engine speed by way of an overspeed prevention inhibiting operation and which is automatically returned to a condition in which it can control the engine speed during restarting of the engine after a stop of the engine. The overspeed preventing circuit is cut off by turning on the cut-off circuit when the engine is driven, so that the overspeed preventing function is inhibited. This cut-off circuit is automatically returned to its off-state when restarting the engine after a stop of the engine, thereby allowing an overspeed of the engine to be prevented.

Growing community of inventors

Shizuoka, Japan

Kazuhiro Umehara