JPH0413395Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an automatic engine stop/start device that automatically stops or starts an engine depending on the operating condition of a vehicle.

(Prior art) In recent years, some automobiles have a system that automatically stops the engine when it stops at an intersection, etc., and the engine speed reaches the same speed as when idling. is equipped with an automatic engine stop/start control device (hereinafter referred to as an idle stop device) that automatically turns on the starter switch and starts the engine when a normal starting operation, such as depressing the clutch pedal, is performed. There is. By installing such an idle stop device, fuel is saved when the engine is idling, and the engine is operated only when the vehicle is running, which greatly reduces exhaust gas and saves fuel. This idle stop device inputs signals from various control devices and sensors related to engine control and operation into an electronic control device, and when these signals reach a predetermined condition, the engine stops, and other signals are input to the electronic control device. When a predetermined condition is reached, the engine will be restarted by the starter.

(Problems with the prior art) The starting command from the electronic control unit that constitutes the above-mentioned idle stop device is normally issued by depressing the clutch pedal. It is assumed that the conditions for starting other than the switch are met. However, if the starting conditions other than the clutch switch, such as the signal from the neutral switch or the signal from the water temperature sensor, are slower than the clutch switch signal and are input to the electronic control circuit and satisfy the starting conditions, the clutch The starter does not operate immediately when the pedal is pressed, but the starter operates as soon as the conditions determined by other sensors are met, and the engine starts. Figure 3 is a processing flow diagram for the above case. In the figure, with the engine waiting to start, after confirming that the driver has depressed the clutch, the water temperature rise and gear position check meet the predetermined conditions. This indicates that a start command is issued to the starter, indicating that the engine will start at a point the driver did not intend. Therefore, in this case, the driver is not only confused;
There are drawbacks that pose problems for safe driving.

(Purpose of the invention) An object of the invention is to provide an automatic engine stop/start device that solves the problems of the above-mentioned idle stop device, eliminates anxiety when starting the engine, and improves safety.

(Summary of the invention) The present invention detects the stopped engine by using at least a signal from an engine rotation sensor that detects when the engine is stopped and a signal from a means for detecting depression of the clutch pedal. In an engine automatic stop/start device that starts,
a priority circuit that outputs a detection signal when receiving a signal from a means for detecting a vehicle operation other than the means for detecting the depression of the clutch pedal; and a priority circuit that outputs a detection signal when a signal from the means for detecting the clutch pedal is generated An automatic engine stop/start device is provided, comprising means for starting the engine only when an output from a priority circuit is being generated.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a block diagram showing an embodiment of an automatic engine stop/start device according to the present invention.

In the figure, reference numeral 1 indicates various sensors and switches related to driving control of the vehicle and engine, including a clutch switch 1a, such as an engine rotation sensor, water temperature sensor, vehicle speed sensor, accelerator sensor, neutral switch, etc. It is configured.

2 is an electronic control circuit composed of a microcomputer, which is equipped with a central processing unit, a memory for storing control programs and procedures for operating the device according to the present invention, input/output ports, etc., and is equipped with the various sensors mentioned above. The switch 1 receives signals from the switch 1 and issues various commands according to a predetermined control program, but the figure shows only the stop command system and start command system necessary for explaining this embodiment, and the others are omitted. . 2a is a priority circuit composed of AND circuits 21, 22, 23 and a NOT circuit 24, and is built in the electronic control circuit 2. The electronic control circuit 2 issues a starting command when various signals from the various sensors and switch 1 mentioned above reach predetermined conditions, and divides the signals under these predetermined conditions into two to output the signals from the clutch switch 1a. Assuming that a signal is A and several types of signals other than A are B, the priority circuit 2a is configured to issue a start command only when signal B precedes signal A in the input order of signals. Therefore, if the signal from the clutch switch 1a precedes other sensor signals, no starting command will be issued.

Next, 3 is an engine stopper, which is a mechanism for stopping the engine upon receiving a stop command from the control device 2. Reference numeral 4 denotes a starter for starting the engine, which operates upon receiving a starting command via the priority circuit 2a built into the electronic control circuit 2. 6 is a battery, and 7 is a battery switch.

Next, to explain the operation of the automatic engine stop/start device configured as described above, when the engine is in the start waiting state, various signals from various sensors and switches 1 related to operation control are sent to the electronic control circuit 2. is input. In the electronic control circuit 2, signals satisfying predetermined conditions regarding engine starting, that is, the signals A and B are respectively input to AND circuits 23 and 21 of a built-in priority circuit 2a. In this case, if the input of the signal B to the AND circuit 21 is early, the signal A of the AND circuit 23 is
Since the other terminal to which the signal A is inputted is positive, the output of the AND circuit 23 becomes positive due to the input of the signal A, and the starting command is transmitted to the starter 4.

Conversely, when signal A is input to the AND circuit 23 in advance of signal B, this input passes through the AND circuits 22, 21, etc., and makes the other input of the AND circuit 23 negative. Therefore, no starting command is issued, and the engine will therefore not start.

Next, FIG. 2 is a flowchart showing the process of the present invention. In the engine waiting to start, in the first step it is confirmed that the clutch pedal is not depressed, and in the next step, the predetermined setting for starting the engine is carried out. This indicates that the starter is turned on by checking the conditions and determining whether the clutch pedal is depressed at the end of the starting conditions. Of the starting conditions, FIG. 2 only shows the water temperature of the step and the gear position of the step with respect to conditions other than the clutch pedal, and other starting conditions are omitted.

In this way, safety is improved since the arrival of the signal from the clutch pedal as the last of all starting conditions causes the starter to act and start the engine.

(Effects of the invention) As explained in detail above, the invention provides a priority circuit in the electronic control device that performs operation control.
Since the starter is configured to be activated by the clutch pedal at the end of the engine starting condition, the engine will not start when the driver does not intend to, which will prevent driver confusion and improve driving safety. It is possible to do so.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the construction of an embodiment of the automatic engine stop/start device of the present invention, FIG. 2 is a process flow diagram of the embodiment, and FIG. 3 is a process flow diagram of a conventional example. 1...Various sensors and switches, 1a...Clutch switch, 2...Electronic control circuit, 2a...
Priority circuit, 3...Engine stopper, 4...
…starter.

Claims (1)

[Scope of utility model registration request] Among the operations of a vehicle, an automatic engine stop/start device that starts an engine that has stopped rotating based on at least a signal from an engine rotation sensor that detects a state in which engine rotation is stopped and a signal from a means that detects depression of a clutch pedal. , a priority circuit that outputs a detection signal when receiving a signal from a means for detecting vehicle operation other than the means for detecting depression of the clutch pedal, and a signal from the means for detecting depression of the clutch pedal is generated. An automatic engine stop/start device comprising means for starting the engine only when an output from the priority circuit is being generated.