Electronic shifter gear position detection and diagnosis circuit

Abstract

The invention provides an electronic shifter gear position detection and diagnosis circuit which comprises a control diagnosis module, a plurality of gear position detection modules, an auxiliary circuit and a power supply module. The control diagnosis module is a control unit circuit taking an S9S12GN16 single chip microcomputer as a core, the gear position detection modules are unipolar hall sensors HAL1506SU-A with power-on self-test functions and connected with the control diagnosis module, the gear position detection modules and the control diagnosis module are combined and used for judging gear switching directions and monitoring positions by the control diagnosis module, the auxiliary circuit comprises a P-channel field-effect transistor BSS84AK, an N-channel field-effect transistorBSS138P, a plurality of resistors and a capacitor, the auxiliary circuit is used for helping the control diagnosis module to achieve self-test timing control of the gear position detection modules, and the power supply module supplies power for a whole circuit and is a circuit taking NCV4725 as a core. According to the circuit, driving safety of vehicles is improved, and the safety level of automotive electronic shifters is improved.

Description

technical field [0001] The invention relates to the technical field of automobile electronics, in particular to a gear position detection and diagnosis circuit of an electronic shifter. Background technique [0002] At present, the gear position detection of automobile gear shifters mostly adopts the non-contact detection method of Hall switch, but it often only uses Hall induction to obtain position signals during driving, and does not pre-check whether the Hall signals are normal, so It is possible that there is no position signal when the shifter is switched to the corresponding position, which will affect driving safety; in addition, in the shift gaps of P, R, N, and D, Hall signals can be sensed or cannot be sensed. Under the circumstances, if the retention time is too long, it will also cause misjudgment of the failure of the system. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a gear position detection...

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Problems solved by technology

[0002] At present, the gear position detection of automobile gear shifters mostly adopts the non-contact detection method of Hall switch, but it often only uses Hall induction to obtain position signals during driving, and does not pre-check whether the Hall signals are normal, so It is possible that there is no position signal when the shifter is switched to the corresponding position, which will affect driving safety; in addition, in the shift gaps of P, R, N, and D, Hall signals can be sensed or cannot be sensed. If the retention time is too long, it will also cause the system to misjudge the failure

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