update in codeigniter 3, it's run but database didnt changed - codeigniter-3

Question

i dont understand with my code. it's run, and work. but when i see in database didnt changed.
here's my controller, function perbarui for get id data, get the data id from model (MMobil).
public function perbarui($id = NULL){
$this->load->model('merek');
$this->load->library('form_validation');
$data['merk'] = $this->merek->getList();
$data['detail'] = $this->MMobil->detail($id);
$submit = $this->input->post('submit');
print_r($data);
if ($submit) {
$nomor_kendaraan = $this->input->post('nomor_kendaraan');
$nomor_mesin = $this->input->post('nomor_mesin');
$id_merek = $this->input->post('id_merek');
$tahun_beli = $this->input->post('tahun_beli');
$nama_mobil = $this->input->post('nama_mobil');
$this->form_validation->set_rules('nama_mobil', 'Nama_Mobil', 'required');
$this->form_validation->set_rules('nomor_kendaraan', 'Nomor_Kendaraan', 'required');
$data['detik'] = $this->MMobil->setData($nomor_kendaraan, $nomor_mesin, $id_merek, $tahun_beli, $nama_mobil);
if ($this->form_validation->run() == FALSE) {
$data['errors'] = TRUE;
}else{
$data['detail'] = $this->MMobil->detail($id);
print_r($data);
}
//redirect('Master');
}
$this->load->view('master-detail-mobil', $data);
}
here's my models. function setData for storage variable after click submit. function edit get id data and get variable arrayData from function setData
public function setData($nomor_kendaraan, $nomor_mesin, $id_merek, $tahun_beli, $nama_mobil){
$this->nomor_kendaraan = $nomor_kendaraan;
$this->nomor_mesin = $nomor_mesin;
$this->id_merek = $id_merek;
$this->tahun_beli = $tahun_beli;
$this->nama_mobil = $nama_mobil;
}
public function edit($id){
$arrayData = array(
'nomor_kendaraan' => $this->nomor_kendaraan,
'nomor_mesin' => $this->nomor_mesin,
'id_merek' => $this->id_merek,
'tahun_beli' => $this->tahun_beli,
'nama_mobil' => $this->nama_mobil,
);
$this->db->where('nomor_mesin', $id);
return $this->db->update($this->table,$arrayData);
}
here's my views
<?php $this->load->view('header.php'); ?>
<?php
echo"<h4>UPDATE DATA</h4>";
?>
<form class="form-horizontal" role="form" method="post" action="<?php echo site_url()?>/Master/perbarui/">
<div class="form-group">
<label class="control-label col-sm-2" for="noken">Nomor Kendaraan :</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="nomor_kendaraan" value="<?php
echo #$detail->nomor_kendaraan;
?>">
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2" for="nomes">Nomor Mesin :</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="nomor_mesin" value="<?php
echo #$detail->nomor_mesin;
?>">
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2" for="merk">Merek Mobil :</label>
<div class="col-sm-10">
<select class="form-control" name="id_merek">
<?php foreach ($merk as $mrk) :?>
<option value="<?php echo $mrk->id_merek ?>">
<?php
echo $mrk->nama_merek;
?>
</option>
<?php endforeach?>
</select>
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2" for="thn">Tahun Beli :</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="tahun_beli" value="<?php
echo #$detail->tahun_beli; ?>">
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2" for="namo">Nama Mobil :</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="nama_mobil" value="<?php
echo #$detail->nama_mobil; ?>">
</div>
</div>
<div class="form-group">
<label class="control-label col-sm-2" for="nomes"></label>
<div class="col-sm-2">
<input type="submit" class="form-control" name="submit" value="simpan">
</div>
</div>
</form>
<?php $this->load->view('footer.php'); ?>
and here my pictures before click submit and after click submit. i typed print_r for see the data array. if you see data array detail before click submit, there is data in detail. but after click submit data array detail gone.
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