Control method for starting up automatic transmission only at P/N gear

A technology of automatic transmission and control unit, which is applied to the layout, transportation and packaging of power plant control mechanism, vehicle parts, etc., and can solve the problems of personal and property hazards, etc.

Active Publication Date: 2013-12-18
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the STLK hard wire is short-circuited to the ground, the triode circuit in the TCU is short-circuited, and the TCU sends a signal to the start relay to start the motor (low-fr

Method used

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  • Control method for starting up automatic transmission only at P/N gear
  • Control method for starting up automatic transmission only at P/N gear
  • Control method for starting up automatic transmission only at P/N gear

Examples

Experimental program
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Embodiment Construction

[0019] Such as figure 1 As shown, the vehicle is not equipped with PEPS:

[0020] The automatic transmission control unit TCU collects the gear position signal of the shift handle, and directly controls the starting relay through hard wires, and then controls the starting motor.

[0021] In P and N gears, when there is no fault in the TCU hard wire (STLK) in the automatic transmission, the TCU sends a hard wire fault (STLK failure) signal on the CAN network to 0 (indicating normal, no fault), and the TCU outputs a low level to the position 2. When the ignition key is in the ignition (START) position, position 1 outputs a high level, the starter relay is closed, the starter motor works, the ECU controls the injector to inject fuel, and the engine starts normally.

[0022] In the P and N gears, when the TCU hard wire (STLK) in the automatic transmission is faulty, the TCU sends a hard wire fault (STLK failure) signal to the ECU through the CAN signal line as 1 (indicating an e...

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PUM

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Abstract

A control method for starting up an automatic transmission only at a P/N gear comprises the steps of: acquiring a P/N gear signal of a gearshift handle through an automatic transmission control unit (TCU); directly controlling to a start relay through a rigid line by the TCU for a vehicle which is not configured with a passive entry passive start system (PEPS); controlling the start relay sequentially through the rigid line and the passive entry passive start system by the automatic TCU for the vehicle which is configured with the passive entry passive start system; monitoring a fault of the rigid line at any time and sending a fault signal to an engine control unit (ECU) through a controller area network (CAN) by the TCU; judging whether to start up an engine in the gear state and selecting whether to receive the fault signal of the rigid line by the ECU. According to the control method for starting up the automatic transmission only at the P/N gear, the TCU monitors the rigid line in real time and sends the fault signal of the rigid line to the ECU through the CAN, and the ECU judges whether to receive the fault signal, so that a double-protection function is achieved.

Description

technical field [0001] The invention belongs to the technical field of automobile automatic transmission control systems, and relates to a control method for starting P and N gears of AT and DCT vehicles. technical background [0002] Such as image 3 The shown prior art automatic transmission is all to have TCU to pass hard wire ( image 3 middle STLK hard line) direct control, TCU in the figure monitors the shifting signal at all times, when shifted to P, N, the triode in the TCU conducts, and outputs low level to the start relay 2, at this time, move the ignition key to ignite When the switch is turned to the start position, the start relay 1 and 2 form a high-low voltage difference, the start relay pulls in, and the starter motor is started; when the gear is shifted to D and R, the starter motor should not be started. At this time, the triode in the TCU is cut off, input the signal of stopping the starting motor (high level) at the starting relay 2, and disconnect the st...

Claims

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Application Information

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IPC IPC(8): B60K26/04
Inventor 高海波张学勇罗超文张健
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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