JPS6353350A - Malfunction preventing device for automatic transmission - Google Patents

Abstract

PURPOSE:To prevent malfunction of a shift and perform backup so as to secure safety running by providing with a means to judge if the optimum speed change stage determined by an electronic controller is mistake or not and a means to select the optimum speed change state again when a judgement of a mistake is obtained. CONSTITUTION:Data for the optimum gear stage are compared with checking data corresponding to the optimum gear stage formed in the previous cycle. If it is judged that the data contents are broken as a result of checking, 'current gear stage' data are read as the optimum gear stage in the part to memorize the optimum gear stage at RAM9e in an electronic controller 9. Then processing of determining the optimum gear stage is performed, and checking data are prepared corresponding to the optimum gear stage for the next control cycle. Then it is determined if the current gear stage is the optimum gear stage or not, and if it is not the optimum gear stage, normal speed change action is performed. If the current gear stage is the optimum gear stage, speed change action is not performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Applicability: ¥1) The present invention relates to an electronically controlled automatic transmission, and particularly relates to a malfunction prevention device for the automatic transmission.

(Prior Art) A proposal has already been made in which an electronic control device configured with a microcomputer controls a transmission to operate a descending shaft gear type transmission in accordance with the operating condition of a vehicle. The control method for shifting gears in this type of automatic transmission is to input the vehicle speed signal from the +lj speed sensor, the accelerator pedal depression signal from the accelerator pedal sensor, and the select lever position signal from the select lever into the electronic control device. Based on these input signals, the electronic control unit searches the optimal gear selection map stored in the storage device within the electronic control unit, selects the optimal gear, and then selects the current gear. When the gear position is input and the current gear position is different from the optimum gear position, a command is issued to the transmission actuator and the franchise actuator, and the 11th row axis south lj type transmission is automatically switched to the optimum gear position.

(Problems to be Solved by the Invention) 1- When a vehicle equipped with an electronically controlled automatic transmission as described above travels on a general road, it is exposed to various external noises. If such external noise invades the circuit of the electronic control unit and destroys the selected optimal gear (1fi) stored in the RAM, the optimal gear The gear will be incorrect and the transmission will not be shifted to the appropriate gear, which may cause engine overrun, transmission overrun, and further damage to the engine and drive system.

Therefore, an object of the present invention is to add a function to check whether the optimum gear stage data is normal or internally destroyed, and when the data content is destroyed, it can be detected to prevent shift malfunctions. It is an object of the present invention to provide a malfunction prevention device for an automatic transmission that can perform backup and ensure safe running performance.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a malfunction prevention device for an automatic transmission that operates a vehicle at an optimal gear determined according to the driving situation of the vehicle. There is provided a malfunction prevention device for an automatic transmission, which includes means for determining whether or not the optimum gear position determined by an electronic control device is incorrect, and means for selecting the optimum gear position again when the error determination is obtained. Ru.

(Operation) The optimum stage data and the optimum data change data created in the previous control cycle are compared.

As a result of the check, if it is determined that the data content is destroyed, the current gear is read as the optimum gear. Thereafter, an optimum gear position determination process is performed, and check data corresponding to the optimum gear position for the next control cycle is created. Thereafter, it is determined whether the current gear is the optimum gear, and if it is not the optimum gear, a gear change operation is performed.

(Example) Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an embodiment of a malfunction prevention device for an automatic transmission according to the present invention, and FIG. 2 is a flowchart of control according to the present invention.

In FIG. 1, ``■'' is a gasoline engine or a diesel engine, which includes a throttle valve or a fuel control rack for controlling the amount of intake gas (air or mixture), and is equipped with a flywheel 1afe. 2 is the clutch body, which is composed of a well-known friction clutch,
3 is a clutch actuator whose piston rod 3a drives the release lever 2a in order to control the engagement of the clutch body 2. 4 is a hydraulic mechanism, and 5 is a transmission actuator. 6 is a synchronized mesh transmission,
It is driven by the transmission actuator 5 to perform gear shifting operations, and includes an input shaft (input shaft) 6a connected to the clutch 2, an output shaft (drive shaft) 6b, and a gear position (
gear position sensor 6c for detecting gear position). 7 is a select lever, which is operated by the driver and selects "N" range (neutral position), "Dj range (automatic shift)", "1" range (1st speed), "2" range (2nd speed), "
3” range (1, 2° 3fl automatic transmission), “4” range (1, 2, 3° 4-speed automatic transmission), “5” range (1
, 2, 3.

Each range of 4.5-speed automatic gear shifting) and rRJ range (reverse) can be selected by the lever position, and a selection signal SP indicating the selected range is outputted by the select sensor 7a. 8a is a driving sensor for detecting the rotation speed of the input shirt h6a; 8b is a vehicle speed sensor for detecting the vehicle speed from the rotation speed of the drive shaft 6b; 10 is an engine rotation sensor; This is for detecting the rotation speed of the engine l by detecting the rotation speed of the flywheel la. Reference numeral 9 denotes an electronic control device composed of a microcomputer, which includes a processor 9a that performs arithmetic processing, a control proger J1 for controlling the transmission 6 and the clutch 3, and a control programmer J1 for controlling the transmission 6 and the clutch 3; , a read-only memory (ROM) 9b storing a program for outputting the results, an output capo) 9c, an input capo) 9d, a random access memory (RAM) 9e for storing calculation results, etc. and an address/data bus (BUS) 9f that connects. The gearbox 9a is provided with a register for calculating the current optimum gear stage and check data to be described later. The output capo) 9C is connected to the clutch actuator 3, the hydraulic mechanism 4, and the transmission actuator 5, and receives a drive signal CDV for driving these.
, PDV, and ADV are output.

On the other hand, the input capo) 9d has various sensors 6C17a, 8a.
, 8b, 10, and an accelerator pedal and a brake pedal, which will be described later, and receive detection signals from these pedals. Reference numeral 11 indicates a sensor lla (potentiometer) that detects the amount of depression of the accelerator pedal cell pedal 11, and reference numeral 12 indicates a brake pedal that includes a sensor 12a (potentiometer) that detects the amount of depression of the brake pedal 12. It is.

Next, the operation of an embodiment of the automatic transmission malfunction prevention device according to the present invention will be described with reference to FIG.

In Fig. 2, the optimum gear stage data is checked (
Step S t), that is, in this check, the previous optimum gear stage data stored in the RAM 9e of the electronic control unit 9 and the check data corresponding to the previously created optimum gear stage are both read out, and [h&appropriate gear stage] ]+[optimum gear change data (for example, supplementary fi of optimum gear data) of the previous control cycle].

Is the check result normal (0) or content is corrupted (≠0)?
The r4 disconnection is made (step S2).

In the case of content destruction, the process proceeds to step S3, where all commands sent to the electromagnetic valves constituting the transmission actuator 5 and clutch actuator 3 are first corrected, and the current gear is locked. Then, RAM9e in the electronic control unit 9
The ``current gear'' data is entered 111 as the optimum gear in the section where the optimum gear is stored.

In step S4, optimum gear stage determination processing is performed. Dora°
Move the shift lever 7 to the driving range (D range, etc.)
, the pro-sensor 9a determines the current "optimal gear" from the transmission shift schedule and the previous optimum gear data, which are not shown in 'B 2 IN.

When the current correct optimal gear is selected in step S4, this data is stored in the RAM 9e, and in step S5, the processor 9a creates check data based on the appropriate gear data. , this is stored in the RAM 9e.

In step S6, the current gear position of the transmission 6 is confirmed, and if it does not match the data in RAMQe, a normal gear shifting operation is performed in step S7, and the flow exits. If the current gear position of the transmission 6 and the contents of the RAM 9a match in step S6, no gear shifting operation is performed and the process exits the flow.

In addition, in step S2, if the check result is normal, the process moves to step S4, and a predetermined sequence is controlled through the same flow as described above.

(Effects of the Invention) As explained in detail in 1-1, the present invention checks whether the optimum gear position data is normal or internally damaged, and if the optimum gear position data is damaged, the current gear position is set as the optimum gear position. After setting, the data contents can be updated to the optimum gear according to the shift schedule, and the system can return to normal without impairing driving performance.

[Brief explanation of the drawing]

FIG. 1 is a flowchart of the automatic transmission malfunction prevention device control according to the present invention. 1...Engine, 6...Transmission, 8a, 8b...
Sensor, 9... Electronic control device, 10... Sensor, 1
1...Accelerator pedal. Patent applicant: Isuri Motors Co., Ltd. Representative: Patent attorney Minoru Tsuji Figure 2

Claims (1)

[Claims] In a malfunction prevention device for an automatic transmission that operates a vehicle at an optimum gear position determined based on the operating condition of the vehicle, a means for determining whether or not the optimum gear position determined by an electronic control device is incorrect; and the error determination device. 1. A malfunction prevention device for an automatic transmission, characterized in that a device for preventing malfunction of an automatic transmission is provided, comprising means for selecting the optimum gear stage again when the gear position is reached.