JPS60122270A - Starting time controlling device for starter - Google Patents

Abstract

PURPOSE:To securely detect the various conditions of a vehicle by prohibiting the starting of a starter until a predetermined time has past after an ignition switch is turned on, even when a starter switch is turned on. CONSTITUTION:As an ignition switch (figure omitted) is turned on, transistor 6 is turned on through a starter control signal, which becomes 1 when a predetermined time has past after the ignition switch is turned on. Thereby a switch 4 is turned on through the excitation of a relay coil 5 and, after that, a coil 3 is electrified only when a starter switch 2 and an N switch 1 (which is turned on only when a speed change gear is in N or P range) are turned on, causing a starter to operate. In this case, said predetermined time is set at about 100- 200msec, to enable the various conditions of a vehicle to be securely detected before the operation of the starter.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a starter start timing control device for an automobile, and particularly to a starter start timing control device that prevents the starter from starting even if the starter inch is turned on until a predetermined period of time has elapsed after the ignition switch is turned on. This invention relates to a starter start timing control device that controls the start timing of a starter.

BACKGROUND OF THE INVENTION In an electronically controlled fuel injection system or the like, when starting an engine, if the engine condition is known in advance, appropriate starting control is possible. For example, it is well known that when starting at a high temperature, it is difficult to start using normal fuel injection control because the fuel pump pressure is low. In this case, prompt startup is possible by predicting the cooling water temperature before startup and increasing the normal injection amount. Therefore, it is conceivable to provide a period of time to detect the state of the vehicle, such as the coolant temperature, before starting the vehicle. However, to perform the above detection during the time from when the ignition switch is turned on until the start switch is turned on, the following steps are required: There are problems such as. For example, if you take an automatic 1-transmission vehicle as an example, starting the starter is a neutral safety switch (hereinafter referred to as the N switch) that is only turned on in the N or P range, as shown in Figure 1. 1 is on, and when the starter switch 2 is turned on, current is passed from the power supply to the coil 3 of the Stark relay to start a starter (not shown). However, the time t from when the ignition switch is turned on until the scooter switch 2 is turned on is a minimum of several tens of milliseconds, and the above detection usually takes about 10 seconds.
Considering that 00 to 200 milliseconds are required, there is no guarantee that the above detection will be completed in time. In FIG. 1, the electronically controlled fuel injection system takes in the change in potential between the stark switch 2, N switch, and check as a signal NSW, and the change in terminal voltage of the stark relay 3 as a signal STA, and executes the necessary control. .

Purpose of the Invention The present invention has been made in view of the above circumstances.
The purpose of this is to ensure that the above-mentioned detection process is performed during the time from when the ignition switch is turned on until when the starter switch is turned on. In order to achieve this objective, the present invention prohibits starting of the start for a predetermined period of time after the ignition switch is turned on.

Embodiment of the invention FIG. 2 is an explanatory diagram of the main part configuration of an embodiment of the invention.
The same reference numerals as in the figure indicate the same parts, 4 is a newly provided switch, 5 is a coil, and when this coil 5 is excited, the switch 4 is turned on. Further, 6 is a transistor that becomes conductive when the starter control signal is '1', and this transistor 6
When the power supply becomes conductive, the scooter switch 2. Coil 5.
Current flows through the resistor 7° transistor 6 and the switch 4 is turned on. The starter control signal becomes "1" after a predetermined period of time has elapsed since the ignition switch was turned on. Therefore, since switch 4 is not turned on until a predetermined time has elapsed after the ignition switch is turned on, even if starter switch 2 and N switch 1 are turned on immediately after the ignition switch is turned on, the above-mentioned predetermined The coil 3 is not energized and the starter is not started until the time has elapsed. Therefore, by setting the above predetermined time to approximately 100 to 200 milliseconds, the electronically controlled fuel injection system, which is supplied with power when the ignition switch is turned on, can reliably detect the vehicle status, etc. becomes.

FIG. 3 is a block diagram of main parts of another embodiment of the present invention,
10 is an automobile battery, 11 is an ignition switch, 12 is a main power source, and 13 is a sub power source. Both types of power sources output a constant voltage from the battery voltage. 1
4 is a microprocessor constituting the electronic control section of the electronically controlled fuel injection device, which includes a data holding memory 1;
It is equipped with 5. The microprocessor 14 operates with a voltage supplied from the main power supply 12, and initialization is performed by detecting the rise of the voltage. Further, the data holding memory 15 operates with a voltage supplied from the sub power supply I3. The data retention memory is generally referred to as a stand-high RAM, and retains its stored contents even if the voltage of the automobile battery 10 drops to some extent.

The Δ/I) converter 1G converts detection signals of analog quantities from various sensors (not shown), such as a cooling water temperature sensor, an intake air temperature sensor, an intake pressure (pressure inside the inner vault) sensor, etc., into digital quantities. , the conversion path N words are sent to the one-cycle IJ sensor 14. Further, the human interface circuit 17 is an interface circuit for inputting digital values such as switch states to the microprocessor 14, and the microprocessor 14 inputs various states via this input interface circuit 17 and the A/L converter 16. read Then, an external device such as an actuator is driven via the output sofa circuit 25 based on the control amount obtained by performing a predetermined calculation or the like.

The transistor 18 is controlled on and off by a starter control signal from the microprocessor 14, and its collector is connected to the voltage VB from the battery 10 through the ignition switch 11 via a resistor 20. A connection point between the collector and the resistor 20 is connected to a control terminal of the suppression circuit 21. A battery voltage (3) controlled by an ignition switch is connected to the input θj111 of the suppression circuit 21 via a starter switch 22. Therefore, even if the scooter switch 22 is turned on, unless the transistor 18 is turned on by the starter control signal, the stark relay coil 23 will not be energized and the starter will not start. In addition,
24 is an N switch.

FIG. 4 is a flowchart showing an example of processing by the microprocessor 14. When the ignition switch 11 is turned on, the main power supply 12. '-'When the output voltage of the I-beam power supply 13 rises, the microprocessor 14 starts the process shown in FIG. First, A/D converter 1
6. Various state quantities are detected and the detected data is stored in the data holding memory 15 via the input interface circuit 17 (Sl). The data detected here is data normally required for engine start control, such as cooling water temperature, intake air temperature, and intake pressure. When all necessary state quantities are detected (S2), the microprocessor 14 turns on the transistor 18 by turning on ("1") the scooter control signal (S3). Then, the routine shifts to normal control (S4). That is, it executes fuel injection control and the like.

FIG. 5 is a timing chart of the device shown in FIG. 3. When the ignition switch 11 is turned on, the microphone processor 14 detects the state quantity before starting, and upon completion of the detection, turns on the start control signal.

The starter relay having the coil 23 works under the condition that the scooter control signal is on and the starter switch 22 is on, so even if the starter switch 22 is turned on immediately after the ignition switch 11 is turned on, the starter will not operate until the scooter control signal is turned on. , and is put on hold until the state quantity detection is completed and the data is stored in the data holding memory 15.

When the scooter starts, the battery voltage decreases,
Even if the system resen (resen) is microphoned and applied to the second processor 14 due to this drop in battery voltage, the data retention memory 15 is guaranteed to retain its contents up to a voltage lower than the battery voltage drop caused by the starter. , the data is retained. In addition, in FIG. 5, when it is assumed that complete engine explosion and starting vJ are achieved at timing T, the starter control signal is then turned off.

6(a) to 6(c) show a configuration in which the transistor 18 portion of FIG. 3 is made redundant. In Figure 3, transistor 1
8, when a short-circuit failure occurs, the inhibiting circuit 21 is in an open state, so that the starting operation is performed in the same manner as in the conventional case, and no serious problem occurs. However, if the 1-run disc 18 has an open failure, starting will be difficult and a serious failure will occur. Two 1-run discs 30 as shown in Fig. 6(a) and (b)
, 31 are connected in parallel and a starter control signal is applied to each base, or as shown in FIG. If the configuration is such that the same starter control signal is applied from the boat, it will be possible to start even if one of the transistors is open or short-circuited.
A sufficient degree of safety can be obtained.

FIG. 7 is a circuit diagram of a main part of still another embodiment of the present invention.

In the previous embodiment, the starter control signal outputted from the microprocessor 14 was used to control the start of the starter, but as shown in FIG. The transistor 18 may be turned on by hardware after the time required for storing the data into the data holding memory has elapsed. In FIG. 7, 40 is a resistor, 41 is a capacitor, and one end of the resistor is connected to the output voltage VCC of the main power supply 12.
, and the connection point between the resistor 40 and the capacitor 41 or the base of the transistor 18. Therefore, after the ignition switch 11 is turned on, the capacitor 41
Starting the scooter can be inhibited only until the voltage is charged to a voltage sufficient to turn on transistor 18. Therefore, by adjusting the time constants of the resistor 40 and capacitor 41, a desired delay time (II) can be obtained.

As described in detail, the present invention prohibits the starter from starting for a predetermined period of time after the ignition switch is turned on even if the stark switch is turned on. It is possible to reliably detect various states of the vehicle before starting control, and there is an advantage that optimal control matching the vehicle state can be performed. In addition, in 7, the period required for information detection of the child control unit is at most 100 to 200.
This is about 1Jsec, and even if there is a delay of this extent from the turning on of the stark switch to the actual start-up, there is almost no problem in practice. In addition, in the future, if a system consisting of a main controller that controls the engine and a group of peripheral controllers that exchange information with this main controller is integrated, system synchronization or necessary initialization will be required. Although a certain amount of time is required to exchange information, the present invention is also applicable to such a system.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional scooter starting, Fig. 2 is an explanatory diagram of the main part configuration of an embodiment of the present invention, Fig. 3 is a main part block diagram of another embodiment of the invention, and Fig. 4 is a micro processor 14
Flowchart 1 showing an example of the process, FIG. 5 is a timing chart of the device shown in FIG. 3, FIG. 6 is a circuit diagram showing a configuration in which the transistor 18 portion of FIG. 3 is made redundant, and FIG. FIG. 3 is a circuit diagram of a main part of yet another embodiment of the present invention. 2.22 is a Stark switch, 3 and 23 are Stark relay coils, 4 is a switch, 5 is a coil, 6° + 8.3
0.31 is a transistor, 10 is a car battery, 11
1 is an ignition switch, 12 is a main power source, 13 is a sub power source, 14 is a microprocessor, and 15 is a data holding memory. Patent applicant: Fujitsu Ten Ltd. Representative patent attorney: Tamamukyu 1 person outside the department Figure 6 (α) (b) Figure 7

Claims (1)

[Claims] In a starting timing control device for a starter in an automobile that has an electronic control unit such as an electronically controlled fuel injection device that is supplied with power and becomes operational when the ignition switch is turned on, even if the starter switch is turned on, the A scooter starting timing control device comprising means for prohibiting starting of a starter until a predetermined time has elapsed after an ignition switch is turned on.